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ommand List
Command List II
The following commands may be used in this course . Click each command to view a description of the command, its syntax, and its command parameters.
Command
access-class
access-list (standard)
access-list (extended)
arp
bandwidth
banner motd
cdp enable
clear frame-relay-inarp
clear ip nat translation
clock rate
clock set
configure terminal
controller
copy running-config startup-config
debug dialer
debug frame-relay lmi
debug ip eigrp
debug ip igrp events
debug ip igrp transactions
debug ip ospf events
debug ip ospf packet
debug ip nat
debug ip rip
debug isdn q921
debug isdn q931
debug ppp
description
dialer-group
dialer idle-timeout
dialer-list
dialer load-threshold
dialer map
dialer pool
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ommand List
dialer pool-member
dialer remote-name
dialer string
disable
duplex
enable
enable password
enable secret
encapsulation
encapsulation frame-relay
encapsulation hdlc
encapsulation ppp
end
erase
exec-timeout
exit
frame-relay inverse-arp
frame-relay lmi-type
frame-relay map
framing
history size
hostname
interface
interface range
ip access-group
ip access-list
ip address
ip classless
ip default-gateway
ip domain-lookup
ip nat
ip nat inside source list
ip nat inside source list pool
ip nat inside source static
ip nat pool
ip route
isdn spid#
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ommand List
isdn switch-type
line console 0
line vty
linecode
logging synchronous
login
mac-address-table static
media-type
name
network
password
ping
ppp authentication
pri-group
router
service password-encryption
setup
show access-lists
show clock
show cdp neighbors
show controller
show dialer
show frame-relay lmi
show frame-relay map
show frame-relay pvc
show frame-relay traffic
show history
show interface brief
show interface status
show interfaces
show ip
show ip eigrp neighbors
show ip eigrp topology
show ip eigrp traffic
show ip interface
show ip nat translations
show ip nat statistics
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ommand List
show ip ospf interface
show ip ospf neighbor
show ip protocols
show ip route
show ip route eigrp
show isdn active
show isdn status
show mac-address-table
show port-security
show protocol access-list
show running-config
show spanning-tree
show startup-config
show version
show vlan
shutdown
switchport access
switchport mode
switchport nonnegotiate
switchport port-security
switchport trunk encapsulation
telnet
terminal editing
terminal history size
traceroute
traffic-share
username
variance
vlan
vtp
Descriptions
Device(config-line)# access-class access-list-number {in | out} The access-class command restricts incoming and outgoing connections between a vty on a Cisco device and
the addresses in an access list.
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Command Parameter Description
access-list-number The ACL that is to be linked to this virtual terminal line.
in Keyword that restricts incoming connections between a Cisco device and the addresses in
the specified access list.
out Keyword that restricts outgoing connections between a Cisco device and the addresses in
the specified access list.
back to top
Device(config)# access-list access-list-number {permit | deny | remark} source
[mask]
The access-list command is used to configure access-list entries for controlling traffic that passes through
network devices, such as routers. The syntax shown above is for a standard access list.
Command Parameter Description
access-list-number The list that the ACL entry belongs to. For standard IP ACLs, this number is
in the ranges of 1 to 99 and 1300 to 1999.
permit | deny Keyword that identifies whether traffic matching the test conditions specifiedby the ACL entry is allowed or blocked.
remark Keyword that allows you to add a description for the ACL.
source The source IP address.
mask The wildcard mask, which is used to determine which bits in the source address are matched. A 0 in the wildcard mask indicates that the
corresponding bit in the address is to be matched; a 1 indicates that the corresponding bit is to be ignored. The default wildcard mask is 0.0.0.0.
back to top
Device(config)# access-list access-list-number {permit | deny} protocol source
source-wildcard [operator port] destination destination-wildcard [operator port]
[established] [log]
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ommand List
Theaccess-list command is used to configure access-list entries for controlling traffic that passes through network devices, such as
routers. The syntax shown above is for an extended access list.
Command Parameter Description
access-list-number The list that the ACL entry belongs to. For extended IP ACLs, this number is in the ranges of
100 to 199 and 2000 to 2699.
permit | deny Keyword that identifies whether traffic matching the test conditions specified by the ACL
entry is allowed or blocked.
protocol The protocol being used to send the packet. The following protocols can be specified for this
parameter: IP, TCP, UDP, ICMP, GRE, and IGRP.
source The source IP address.
source-wildcard The wildcard mask that is used to determine which bits in the source address are matched.
A 0 in the wildcard mask indicates that the corresponding bit in the address is to be
matched; a 1 indicates that the corresponding bit is to be ignored.
destination The destination IP address.
destination-wildcard The wildcard mask that is used to determine which bits in the destination address arematched. A 0 in the wildcard mask indicates that the corresponding bit in the address is to
be matched; a 1 indicates that the corresponding bit is to be ignored.
operator Mathematical operator that is used to specify ranges of ports as well as specific ports to
match on. Possible values includeeq (equal), lt (less than), gt (greater than), andneq
(not equal).
port Port number of packets being matched. This parameter is used in conjunction with an
operator and can be specified for both source and destination.
established Keyword used in conjunction with TCP traffic that allows TCP traffic to pass if the packets
are using an established connection (that is, the packets have their acknowledgment bits
set).
log Keyword that sends a logging message to the console whenever traffic matching the ACL
entry is identified.
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Device(config)# arp ip-address hardware-address encapsulation-type [alias]
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ommand List
Thearp command is used to add a permanent entry in the ARP cache. You can remove an entry from the ARP cache using the no
form of this command.
Command Parameter Description
ip-address IP address in four-part dotted-decimal format that corresponds to the local data link address
(a 32-bit address).
hardware-address Local data link address (a 48-bit address).
encapsulation-type The encapsulation type. For Ethernet interfaces, this is typically the arpa keyword. For
FDDI and Token Ring interfaces, this is the snap keyword.
[alias] (Optional) Causes the software to respond to ARP requests as if it were the owner of both
the specified IP address and hardware address, whether proxy ARP is enabled or not.
back to top
Device(config-if)# bandwidth bandwidth
Thebandwidth command sets a bandwidth value for an interface.
Command Parameter Description
bandwidth Bandwidth value in kilobits per second.
back to top
Device(config)# banner motd d message d
Thebanner motd command configures a message of the day banner to be displayed at login.
Command Parameter Description
d Delimiting character used to signal the beginning and the end of the message. The
delimiting character can be any character on the keyboard but cannot be a character that
appears in the message.
message Text to be displayed as the message of the day.
back to top
Device(config-if)# cdp enable
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ommand List
Thecdp enable command enables CDP on an interface. Theno cdp enable command disables CDP on an interface.
Command Parameter Description
N/A Thecdp enable command does not take arguments or keywords.
back to top
Device# clear frame-relay-inarp
Theclear frame relay-inarp command is used to clear dynamically created Frame Relay maps that are created by the use of the
Inverse Address Resolution Protocol.
Command Parameter Description
N/A Theclear frame-relay-inarp command does not take arguments or keywords.
back to top
Device# clear ip nat translation [ protocol] {* | inside global-ip global-port
local-ip local-port [outside local-ip local-port global-ip global-port]}
Theclear ip nat translation command clears dynamic translation entries from the NAT table.
Command Parameter Description
protocol Protocol of entries to be cleared (TCP, UDP, or ESP).
* Wildcard character that tells the router to clear all dynamic address translation entries from
the NAT table.
inside Keyword that tells the router to clear inside translations containing the specified global and
local IP addresses and ports.
outside Keyword that tells the router to clear outside translations containing the specified global and
local IP addresses and ports.
global-ip Global IP address.
global-port Global port. Theglobal-port parameter is specified when clearing extended address
translation entries.local-ip Local IP address.
local-port Local port. The local-port parameter is specified when clearing extended address
translation entries.
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ommand List
Device(config-if)# clock rate clock-rate
Theclock rate command configures the clock rate on serial interfaces.
Command Parameter Description
clock-rate Desired clock rate in bits per second.
back to top
Device# clock set hh:mm:ss day month year
Theclock set command sets the current time and date.
Command Parameter Description
hh:mm:ss Current time in hours (military format), minutes, and seconds.
day Current day of the month (integer value from 1 to 31).
month Current month (by name, not number).
year Current year (four-digit integer value).
back to top
Device# configure terminal
Theconfigure terminal command is used to enter global configuration mode.
Command Parameter Description
N/A Theconfigure terminal command does not take arguments.
back to top
Device(config)# controller controller slot/port
Thecontroller command enters controller configuration mode for a T1 or E1 controller.
Command Parameter Description
controller Type of controller being configured. Possible values are t1 ande1.
slot/port Slot and port numbers of the controller interface on the router.
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ommand List
Device# copy running-config startup-config
Thecopy running-config startup-config command saves the current running configuration to thestartup-config file.
Command Parameter Description
N/A Thecopy running-config startup-config command does not take arguments.
back to top
Device# debug dialer [events | packets]
Thedebug dialer command displays DDR debugging information about the packets received on a dialer interface.
Command Parameter Description
events Keyword used to display the cause of any call. Information displayed includes the name of the
DDR interface, the type of packet (protocol) being sent, and the source and destinationaddresses of the packet.
packets Keyword used to display information about packets being sent as part of a call. Information
displayed includes the interface type, the type of packet (protocol) being sent, the source and
destination addresses, the size of the packet, and the default action for the packet ( permit
or deny).
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Device# debug frame-relay lmi [interface name]
Thedebug frame-relay lmi command is used to display information on the LMI packets exchanged by the router and the Frame
Relay service provider. Theno form of this command disables debugging output.
Command Parameter Description
interface name (Optional) Name of interface.
back to top
Device# debug ip eigrp
Thedebug ip eigrp command displays EIGRP packets as they are sent and received.
Command Parameter Description
N/A Thedebug ip eigrp command does not take arguments.
back to top
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Device# debug ip igrp events [ip-address]
Thedebug ip igrp events command displays a summary of IGRP routing information.
Command Parameter Description
ip-address (Optional) IP address of an IGRP neighbor. If an IP address is specified, the output of thedebug ip igrp events command will include summary information about IGRP
transactions that occur between the router and the specified IGRP neighbor only.
back to top
Device# debug ip igrp transactions [ip-address]
Thedebug ip igrp transactions command displays information about IGRP transactions as they occur.
Command Parameter Description
ip-address (Optional) IP address of an IGRP neighbor. If an IP address is specified, the output of the
debug ip igrp transactions command will include IGRP transactions between the
router and the specified IGRP neighbor only.
back to top
Device# debug ip ospf eventsThedebug ip ospf events command displays information on OSPF events, such as designated router selection and SPF
calculation.
Command Parameter Description
N/A Thedebug ip ospf events command does not take arguments.
back to top
Device# debug ip ospf packet
Thedebug ip ospf packet command displays information about each OSPF packet that is received.
Command Parameter Description
N/A Thedebug ip ospf packet command does not take arguments.
back to top
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ommand List
Device# debug ip nat
Thedebug ip nat command displays information about every packet that is translated by a device.
Command Parameter Description
N/A Thedebug ip nat command does not take arguments.
back to top
Device# debug ip rip
Thedebug ip rip command displays RIP routing updates as they are sent and received.
Command Parameter Description
N/A Thedebug ip rip command does not take arguments.
back to top
Device# debug isdn q921
Thedebug isdn q921 command displays ISDN layer 2 messages.
Command Parameter DescriptionN/A Thedebug isdn q921 command does not take arguments.
back to top
Device# debug isdn q931
Thedebug isdn q931 command displays ISDN call setup and teardown activity (layer 3).
Command Parameter Description
N/A Thedebug isdn q931 command does not take arguments.
back to top
Device# debug ppp {packet | negotiation | error | authentication | compression |
cbcp}
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Thedebug ppp command displays information on traffic and exchanges in an internetwork implementing PPP. The no form of this
command disables debugging output.
Command Parameter Description
packet Displays PPP packets sent and received.
negotiation Displays PPP packets transmitted during PPP startup, where PPP options are negotiated.
error Displays protocol errors and error statistics associated with PPP connection negotiation andoperation.
authentication Displays authentication protocol messages, including CHAP packet exchanges and PAP
exchanges.
compression Displays information specific to the exchange of PPP connections using MPPC. This is
useful for obtaining incorrect packet sequence number information where MPPC
compression is enabled.
cbcp Displays protocol errors and statistics associated with PPP connection negotiations using
MSCB.
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Device(config-if)# description string
Thedescription command configures a description for the configured interface to allow administrators to easily identify the interface
function.
Command Parameter Description
string Text identifying the function of the interface or other useful data (such as location,information about the connected ISP, responsible authority, and so forth).
back to top
Device(config-if)# dialer-group dialer-group
Thedialer-group command binds an interesting traffic definition to an interface.
Command Parameter Description
dialer-group Number of the dialer group that the interface belongs to. The dialer group number can be an
integer from 1 to 10. This number must match the dialer-group parameter specified in
thedialer-list command. Each interface can have only one dialer group, but the same
dialer list can be assigned to multiple interfaces.
back to top
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ommand List
Device(config-if)# dialer idle-timeout seconds
Thedialer idle-timeout command specifies the number of idle seconds before a call is disconnected.
Command Parameter Description
seconds The number of seconds until a call is disconnected after the last interesting traffic is sent.
The default is 120.
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Device(config)# dialer-list dialer-group protocol protocol-name {permit | deny |
list list-number }
Thedialer-list command identifies which packets are to be considered interesting for the purpose of triggering DDR.
Command Parameter Description
dialer-group Number that maps a dialer list to an interface. This number must be the same as the dialer group number configured using the dialer-group command.
protocol protocol-name Layer 3 protocol of packets that are designated as interesting. Choices include IP, IPX,
AppleTalk, DECnet, and VINES.
permit | deny Keywords that designate whether to allow or block packets that belong to the specified layer-
3 protocol. If the list list-number parameter is specified, thepermit anddeny
keywords are not used.
list list-number Access list that is to be used to identify interesting traffic. The list parameter is used when
you need to identify interesting traffic at a more granular level than the level-3 protocol.
back to top
Device(config-if)# dialer load-threshold load [outbound | inbound | either]
Thedialer load-threshold command establishes how much traffic must be on a DDR link before a second link is enabled.
Command Parameter Description
load Interface load (from 1 to 255) beyond which the dialer will initiate another call to the
destination. The bandwidth is defined as a ratio of 255, where 255 is 100 percent of theavailable bandwidth.
outbound | inbound | either (Optional) Keywords that identify the traffic direction for which bandwidth is calculated. The
outbound keyword calculates the actual load using outbound traffic only. The inbound
keyword calculates the actual load using inbound traffic only. The either keyword
calculates the actual load using combined outbound and inbound loads. The default is
outbound.
back to top
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ommand List
Device(config-if)# dialer map protocol next-hop-address [name hostname] [speed 56
| 64] [broadcast] dialer-string
Thedialer map command configures contact information for reaching one or more DDR destinations.
Command Parameter Description
protocol Layer-3 protocol being used. Options include IP, IPX, AppleTalk, DECnet, and VINES.next-hop-address Address of the next-hop router.
name hostname (Optional) Host name of the remote device. This name is used for PPP authentication or
ISDN calls supporting caller ID.
speed 56 | 64 (Optional) The link speed (in Kbps) to use for ISDN calls. The default is 64.
broadcast (Optional) Keyword that indicates that broadcasts and multicasts are permitted to be
forwarded to this destination (but only when the link is enabled by interesting traffic). DDR is
nonbroadcast by default, so no update traffic will cross the link unless this parameter is set.
Thebroadcast keyword permits the use of dynamic routing protocols over the connection
dialer-string Telephone number sent to the device when packets that have the specified next-hop
address are received.
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Device(config-if)# dialer pool number
Thedialer pool command specifies the pool of physical interfaces that are available to reach the destination subnetwork.
Command Parameter Description
number The number used to identify the dialer pool. This parameter can have a value from 1 to 255.
back to top
Device(config-if)# dialer pool-member number [priority priority ] [min-link
minimum ] [max-link maximum ]
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Thedialer pool-member command associates a physical interface with a specifically numbered dialer pool, then places the
interface in that pool.
Command Parameter Description
number The number of the dialer pool that the interface is part of. The dialer pool number is a
decimal value from 1 to 255.
priority priority The priority of the physical interface within the dialer pool when the dialer pool contains
multiple physical interfaces. Interfaces with the highest priority number are selected firstwhen dialing out. This parameter is used to determine which interfaces are used the most or
to determine which are reserved for special pool purposes. This parameter takes a decimal
value from 1 to 255.
min-link minimum The minimum number of ISDN B channels on an interface that are reserved for this dialing
pool. This minimum number ranges from 1 to 255. This parameter is used for dialer backup.
max-link maximum The maximum number of ISDN B channels on an interface that are reserved for this dialing
pool. This maximum number ranges from 1 to 255. This parameter is used for dialer backup.
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Device(config-if)# dialer remote-name name
Thedialer remote-name command specifies the authentication name of the remote router on the destination subnetwork for a
dialer interface.
Command Parameter Description
name The authentication name of the remote router.
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Device(config-if)# dialer string number [class map class-name]
Thedialer string command specifies the telephone number of the destination in a dialer profile.
Command Parameter Description
number The telephone number of the destination.
class map class-name (Optional) A specific map class to use in the call. The map class defines characteristics for
calls to the specified destination.
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Device# disable
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Thedisable command exits privileged EXEC mode and returns the device to user EXEC mode.
Command Parameter Description
N/A Thedisable command does not take arguments.
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Device(config-if)# duplex {auto | full | half}
Theduplex command specifies the duplex mode of operation for the specified interface.
Command Parameter Description
auto Keyword that sets duplex mode to autonegotiation.
full Keyword that sets duplex mode to full duplex.
half Keyword that sets duplex mode to half duplex.
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Device> enable
Theenable command is used to enter privileged EXEC mode.
Command Parameter Description
N/A Theenable command does not take arguments.
back to top
Device> enable password password
Theenable password command configures the enable password for a device (the password used to access privileged mode on a
device).
Command Parameter Description
password The password to be used as the enable password. The enable password is not encrypted in
the running-config and is not used if an enable secret password is configured for the device.
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Device> enable secret password
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Theenable secret command configures the enable secret password for a device (the password used to access privileged mode on
device).
Command Parameter Description
password The password to be used as the enable secret password. The enable secret password is
encrypted in the running-config and is used instead of the enable password if it is configured
for a device.
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Device(config-subif)# encapsulation [isl | dot1q] vlan-identifier
Theencapsulation subinterface command configures ISL or 802.1Q encapsulation on a VLAN.
Command Parameter Description
Isl Keyword that specifies that ISL encapsulation is to be enabled on the subinterface.
dot1q Keyword that specifies that 802.1Q encapsulation is to be enabled on the subinterface.
vlan-identifier The number of the VLAN being configured.
back to top
Device(config-if)# encapsulation frame-relay [cisco | ietf]
Theencapsulation frame-relay command enables Frame Relay encapsulation on an interface. To disable Frame Relay
encapsulation, use the no form of this command.
Command Parameter Description
cisco (Optional) Keyword that specifies Cisco’s proprietary encapsulation method, which uses a 4-
byte header, with 2 bytes to identify the DLCI and 2 bytes to identify the packet type.
ietf (Optional) Sets the encapsulation method to comply with the IETF standard (RFC 1490).
Use this keyword when connecting to another vendor's equipment across a Frame Relay
network.
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Device(config-if)# encapsulation hdlc
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Theexec-timeout sets the amount of time that the console will wait for user input before logging out of the current EXEC session.
Command Parameter Description
minutes Number of minutes that the system will wait for user input. If a value of 0 0 is used (meaning
0 minutes, 0 seconds), the timeout is disabled and the session will never time out.
seconds (Optional.) Number of seconds that the system will wait (in addition to the value specified for
minutes ) for user input.
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Device(configuration-mode)# exit
Theexit command exits the current configuration mode and backs the device up one level to the previous configuration mode. For
example, typingexit from interface configuration mode returns the device to global configuration mode. Typing exit from global
configuration mode returns the device to privileged EXEC mode.
Command Parameter Description
N/A Theexit command does not take arguments.
back to top
Device(config-if)# frame-relay inverse-arp [ protocol] [dlci]
The frame-relay inverse-arp command re-enables Inverse ARP on a specified interface or subinterface if it was previously
disabled on a router configured for Frame Relay. Use the no form of this command to disable this feature.
Command Parameter Description
protocol Level 3 protocol being used. Supported protocols are AppleTalk, DECnet, IP, IPX, Vines,
and XNS.
dlci One of the DLCI numbers used on the interface. Acceptable numbers are integers in the
range of 16 through 1007.
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Device(config-if)# frame-relay lmi-type {ansi | cisco | q933a}
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The frame-relay lmi-type command is used to select the LMI type. To return to the default LMI type, use theno form of this
command.
Command Parameter Description
ansi Annex D defined by ANSI standard T1.617.
cisco LMI type defined jointly by Cisco and three other companies.
q933a ITU-T Q.933 Annex A.
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Device(config-if)# frame-relay map protocol protocol-address dlci [broadcast]
[ietf | cisco | payload-compress packet-by-packet]
The frame-relay map command is used to define the mapping between a destination protocol address and the DLCI used to
connect to the destination address. Use the no form of this command to delete the map entry.
Command Parameter Description
protocol Supported protocol, bridging, or logical link control keywords: appletalk, decnet, dlsw,
ip, ipx, llc2, rsrb, vines, andxns.
protocol-address Destination protocol address.
dlci DLCI number used to connect to the specified protocol address on the interface.
broadcast (Optional) Keyword that allows broadcasts and multicasts over the VC. This keyword allows
the use of dynamic routing protocols over the VC.
ietf (Optional) Keyword that specifies the use of IETF Frame Relay encapsulation. Use when therouter or access server is connected to another vendor's equipment across a Frame Relay
network.
cisco (Optional) Keyword that specifies the use of Cisco Frame Relay encapsulation.
payload-compress packet-by-packet
(Optional) Keyword that enables packet-by-packet payload compression using the Stacker
method. This is a Cisco proprietary compression method.
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Device(config-controller)# framing frame-type
The framing command selects a frame type for a T1 or E1 data line.
Command Parameter Description
frame-type Type of framing to be used for transmitting data over a T1 or E1 line. Possible T1 values
includesf (default) andesf. Possible E1 values includecrc4 (default) andno-crc4. The
australia keyword can optionally be used with no-crc4 to specify an E1 frame type used
in Australia.
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Device(config-line)# history size lines
Thehistory size command configures the size of the command history buffer for the specified line.
Command Parameter Description
lines Number of command lines that the device will record in its history buffer. The range is from 0
to 256. The default is 10.
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Device(config)# hostname name
Thehostname command is used to specify or modify the host name for the network server.
Command Parameter Description
name New host name for the network server.
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Device(config)# interface type number [.subinterface-number [multipoint | point-to
point]]
The interface command is used to configure an interface or subinterface.
Command Parameter Description
type Type of interface to be configured (for example, ethernet, fastethernet, serial ,
vlan , or loopback).
number Port, connector, or interface card number. Some Cisco devices require both a slot and port
number in the formslot/port .
subinterface-number (Optional) Subinterface to be configured. Thesubinterface-number parameter tells the
interface command to enter subinterface configuration mode for the specified interface.
multipoint (Optional) Keyword that specifies a multipoint subinterface.
point-to-point (Optional) Keyword that specifies a point-to-point subinterface.
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Device(config)# interface range {vlan vlan_id – vlan_id } { port-range | macro name}
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The interface range command is used to execute a command on multiple ports at the same time.
Command Parameter Description
vlan vlan_id – vlan_id Keyword and variables to specify a VLAN range. Valid ranges are from 1 to 1005.
port-range Port range
macro name Keyword and variable to specify the name of a macro
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Device(config-if)# ip access-group access-list-identifier {in | out}
The ip access-group command activates an IP ACL on an interface.
Command Parameter Description
access-list-identifier The ACL that is to be linked to this interface. This parameter can be a number or an
alphanumeric string.
in | out Keyword that identifies the direction (incoming or outgoing) in which the ACL is applied on
the interface
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Device(config)# ip access-list {standard | extended} name
Device(config {std- | ext-}nacl)# {permit | deny} {IP access list test conditions
{permit | deny} {IP access list test conditions} no {permit | deny} { IP access
list test conditions }
The ip access-list command is used to configure named access-lists for controlling traffic that passes through network devices, suc
as routers. Issuing the ip access-list command places you in a configuration mode where you can configure the permit andden
statements that will comprise the ACL.
Command Parameter Description
standard | extended Keyword that identifies whether the ACL being configured is a standard ACL or an extended
ACL.
name The alphanumeric name that will be used to represent the ACL.
permit | deny Keyword that identifies whether traffic matching the test conditions specified by the ACL
entry is allowed or blocked.
IP access list test conditions The conditions that must be matched for a packet to be permitted or denied by this ACL
entry. For standard ACLs, the test conditions consist of the source IP address and a
wildcard mask. For extended ACLs, the test conditions consist of the protocol, the source
and destination IP addresses and masks, the source and destination ports, and for TCP
packets, whether the connection is already established.
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no Keyword used to remove a test from a named ACL.
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Device(config-if)# ip address address mask
The ip address command assigns an IP address to an interface or subinterface. To remove an IP address or disable IP processing,
use the no form of this command.
Command Parameter Description
address IP address being assigned to the interface.
mask (Optional) Subnet mask of the network to which the interface belongs.
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Device(config-if)# ip classless
The ip classless command tells a classful router to use the default route to forward packets addressed to unknown subnets of
directly connected networks.
Command Parameter Description
N/A The ip classless command does not take arguments.
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Device(config)# ip default-gateway address
The ip default-gateway command configures a default gateway on a device.
Command Parameter Description
address IP address of the default gateway.
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Device# ip domain-lookup
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The ip domain-lookup command enables DNS lookups on a device. With DNS lookups enabled, the device will query a DNS serve
for anything entered on a command-line that it does not recognize. The no form of this command disables domain lookups, which is
useful when configuring a device to prevent domain lookups on misspelled commands.
Command Parameter Description
N/A The ip domain-lookup command does not take arguments or keywords.
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Device(config-if)# ip nat [inside | outside]
The ip nat [inside | outside] command identifies an interface on a router as being connected to the inside network or the outside
network for the purposes of NAT translation.
Command Parameter Description
inside Keyword that marks the interface as connected to the inside.
outside Keyword that marks the interface as connected to the outside.
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Device(config)# ip nat inside source list access-list-number interface interface
overload
The ip nat inside source list command with theoverload parameter configures the router to use PAT to translate inside local
addresses to a single global address.
Command Parameter Description
access-list-number Standard ACL that identifies the inside local addresses to be translated using PAT.
interface Outgoing interface whose IP address will be used as the global address for all inside local
addresses translated using PAT.
overload Keyword that enables PAT.
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Device(config)# ip nat inside source list access-list-number pool name
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The ip nat inside source list pool command configures the router to use dynamic PAT to translate inside local addresses to a
pool of global addresses.
Command Parameter Description
access-list-number Standard ACL that identifies the inside local addresses to be translated using NAT.
name Name of the pool of global addresses that are available for NAT to use in the translation
process.
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Device(config)# ip nat inside source static local-ip global-ip
The ip nat inside source static command configures a static NAT entry in the router ’s NAT table to translate a specified local
address to a specified global address.
Command Parameter Description
local-ip The inside local IP address that is to be translated.
global-ip The global IP address that the local address is to be translated into.
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Device(config)# ip nat pool name start-ip end-ip {netmask netmask | prefix-length
prefix-length}
The ip nat pool command defines a pool of global IP addresses to be allocated as needed during NAT operation.
Command Parameter Description
name Name to be assigned to the pool of global addresses that are available for NAT to use in the
translation process.
start-ip end-ip IP address range of global addresses to be used by NAT.
netmask netmask Subnet mask of the network to which the pool addresses belong. The netmask value is
given in dotted-decimal format.
prefix-length prefix-length Subnet mask of the network to which the pool addresses belong. The prefix-length value isthe number of bits in the subnet mask that represent the network portion of the address
(indicated by 1 bits).
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Device(config)# ip route network [ mask] {next-hop | interface} [distance]
[permanent]
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The isdn switch-type command specifies the type of switch that a router communicates with during ISDN operation.
Command Parameter Description
switch-type Type of ISDN switch. The following are common values for this parameter:
BRI Switches PRI Switches Description Region
basic-5ess: primary-5ess AT&T United States
basic-dms100 primary-dms100 Nortel North America
basic-nil primary-ni National ISDN-1 North America
basic-net3 primary-net5 Net3 United Kingdom and
Europe
ntt primary-ntt NTT ISDN Japan
basic ts013 . TS013 Australia
none . No switch
specified
.
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Device(config)# line console 0
The line console 0 command places the router in line configuration mode for the console terminal.
Command Parameter Description
N/A The line console 0 command does not take arguments.
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Device(config)# line vty {vty-number | vty-range}
The line vty command places the router in line configuration mode for the specified vty line or range of vty lines.
Command Parameter Description
vty-number Specific vty line to be configured.
vty-range Range of vty lines to be configured.
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Device(config-controller)# linecode linecode-type
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The linecode command selects a line-code type for a T1 or E1 data line.
Command Parameter Description
linecode-type Line coding to be used for transmitting data over a T1 or E1 line. Possible T1 values include
ami (default) andb8zs. Possible E1 values includeami andhdb3 (default).
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Device(config-line)# logging synchronous [level severity | all] [limit number ]
The logging synchronous command tells the device to redisplay your input after each console message that displays while you
are typing.
Command Parameter Description
level severity (Optional) Value that identifies the level at which messages are not to be printed
synchronously. Messages with a severity level equal to or higher than severity are to be
printed asynchronously. Lower numbers indicate greater severity.
all (Optional) Keyword that indicates that all messages are to be printed asynchronously.
limit number (Optional) Value that identifies the number of buffers to be queued for the terminal before
new messages are dropped.
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Device(config-line)# login
The login command enables password checking at login for the specified console or virtual terminal lines.
Command Parameter Description
N/A The login command does not take arguments.
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Device(config-if)# mac-address-table static mac-address vlan vlan interface
interface
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Themac-address-table static command adds a static entry to the MAC address table.
Command Parameter Description
mac-address The MAC address being added to the MAC table.
vlan vlan VLAN that the device that owns the MAC address belongs to.
interface interface The interface out which the device that owns the MAC address can be found.
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Device(config-if)# media-type {aui | 10baset | 100baset | mii}
Themedia-type command specifies a physical connection on an interface.
Command Parameter Description
aui AUI 15-pin connection. This is the default on Cisco 4000 Series routers.
10baset RJ-45 10BaseT connection.
100baset RJ-45 100BaseT connection. This is the default on Cisco 7000 Series and Cisco 7200 Series
routers.
mii Media Independent interface.
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Device(config-vlan)# name vlan-name
Thename command specifies a name for the VLAN being configured.
Command Parameter Description
vlan-name The name being assigned to the VLAN. This value must be an ASCII string containing from
1 to 32 characters, and it must be unique within the administrative domain.
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Device(config-router)# network network-number [wildcard-mask] [area area-id ]
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Thenetwork command designates which directly connected networks participate in the routing process for the configured routing
protocol.
Command Parameter Description
network-number IP address of a directly connected network that will participate in the routing process. With
RIP, IGRP, and EIGRP, this is a classful network address. OSPF allows the use of wildcard
masks for configuring classless network addresses.
wildcard-mask (OSPF only) Wildcard mask, used to identify the network portion of the address. A 0 in thewildcard mask indicates a match, and a 1 indicates that the bits are not to be used as part of
the network address. For example, a wildcard mask of 0.0.0.0 indicates a match of all 32 bits
in the address.
area area-id (OSPF only) Area that is to be associated with the OSPF address range. It can be specified
either as a decimal value or in dotted-decimal notation.
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Device(config-line)# password password
Thepassword command configures a password for the specified console or virtual terminal lines.
Command Parameter Description
password The password that will be used to access the specified console or virtual terminal lines.
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Device(config)# ping host
Theping command is used to test connectivity to a network host.
Command Parameter Description
host Name or IP address of the host being pinged.
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Device(config-if)# ppp authentication {chap | chap pap | pap chap | pap}
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Theppp authentication command is used to specify the method of authentication that will be used between two hosts in a PPP
connection.
Command Parameter Description
chap Keyword that enables CHAP on a serial interface.
chap pap Keyword that enables both CHAP and PAP on a serial interface. CHAP authentication is
attempted first, and if the routers are unable to perform CHAP, PAP authentication is
attempted.
pap chap Keyword that enables both PAP and CHAP on a serial interface. PAP authentication is
attempted first, and if the routers are unable to perform PAP, CHAP is attempted.
pap Keyword that enables PAP on a serial interface.
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Device(config-controller)# pri-group timeslots range
Thepri-group command enables PRI on a T1 or E1 interface.
Command Parameter Description
timeslots Keyword used to specify a range of 64-Kbps channels to use in the PRI operation.
range Range of timeslots to be used. For ISDN PRI on a T1, the value 1-24 specifies the use of 23
B channels and 1 D channels, and for ISDN PRI on an E1, the value 1-31 specifies the use of
30 B channels and 1 D channel.
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Device(config)# router protocol [keyword ]
The router command starts a routing process and enters router configuration mode for the designated routing protocol.
Command Parameter Description
protocol Routing protocol to be configured (RIP, IGRP, EIGRP, or OSPF)
keyword (Optional) Additional parameter required by some routing protocols. For example, IGRP andEIGRP require that an autonomous system number be identified when configuring the
routing protocol on a router. OSPF requires that you specify a local process ID for the OSPF
process that you are configuring.
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Device(config)# service password-encryption
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Theservice password-encryption command is used to encrypt passwords. All passwords that are entered between the
execution of this command and the execution of the no service password-encryption command are encrypted.
Command Parameter Description
N/A Theservice password-encryption command does not take arguments.
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Device(config)# setup
Thesetup command launches the system configuration dialog, which walks you through a basic configuration of a router or switch.
Command Parameter Description
N/A Thesetup command does not take arguments.
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Device# show access-lists [access-list-identifier ]
Theshow access-lists command displays the contents of all ACLs configured on a Cisco device.
Command Parameter Description
access-list-identifier (Optional) The name or number of a specific ACL. If this parameter is used, only the
contents of the specified ACL are displayed.
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Device# show clock
Theshow clock command displays the current time and date.
Command Parameter Description
N/A Theshow clock command does not take arguments.
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Device# show cdp neighbors [interface] [detail]
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Theshow cdp neighbors command displays information about neighboring devices that were discovered using CDP.
Command Parameter Description
interface (Optional) The interface that is connected to the neighbors that you want to display
information about. If this argument is not specified, the show cdp neighbors command
displays information about all CDP neighbors.
detail Keyword that tells the router to display detailed information about its CDP neighbors.
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Device# show controller type number
Theshow controller command displays information about the specified physical interface, such as the type of cable connected to
the interface.
Command Parameter Description
type Type of interface (such as ethernet, fastethernet, serial, or atm).
number Port, connector, or interface card number. Some Cisco devices require both a slot and port
number in the formslot/port .
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Device# show dialer [interface type number ]
Theshow dialer command lists general diagnostic information about an interface configured for DDR, such as the number of timesthe dialer string has been successfully reached, the idle and fast-idle timer values for each B channel, and current-call-specific
information (such as the length of the call and the number and name of the device that the interface is currently connected to).
Command Parameter Description
interface type number (Optional) A specific interface for which dialer information is to be displayed.
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Device# show frame-relay lmi [type number ]
Theshow frame-relay lmi command is used to display statistics about the LMI.
Command Parameter Description
type (Optional) Interface type. It must be serial.
number (Optional) Interface number.
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Device# show frame-relay map
Theshow frame-relay map command is used to display the current map entries and information about the connections.
Command Parameter Description
N/A Theshow frame-relay map command does not take arguments or keywords.
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Device# show frame-relay pvc [interface interface] [dlci] [64-bit]
Theshow frame-relay pvc command is used to display statistics about PVCs for Frame Relay interfaces.
Command Parameter Description
interface interface (Optional) Specific interface for which PVC information will be displayed.
dlci (Optional) A specific DLCI number used on the interface. Statistics for the specified PVC are
displayed when a DLCI is also specified.
64-bit (Optional) Keyword that tells the router to display 64-bit counter statistics.
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Device# show frame-relay traffic
Theshow frame-relay traffic command is used to display the global Frame Relay statistics since the last reload.
Command Parameter Description
N/A Theshow frame-relay traffic command does not take arguments or keywords.
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Device# show history
Theshow history command lists the contents of the command history buffer (that is, the most recent commands [as determined by
the size of the command history buffer] that have been entered during the current EXEC session).
Command Parameter Description
N/A Theshow history command does not take arguments or keywords.
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Device# show ip
Theshow ip command displays IP address, subnet mask, and other IP settings on a device.
Command Parameter Description
N/A Theshow ip command does not take arguments or keywords.
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Device# show ip eigrp neighbors
Theshow ip eigrp neighbors command displays neighbors discovered by EIGRP.
Command Parameter Description
N/A Theshow ip eigrp neighbors command does not take arguments.
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Device# show ip eigrp topology
Theshow ip eigrp topology command displays the EIGRP topology table. This command shows the topology table, the active o
passive state of routes, the number of successors, and the feasible distance to the destination.
Command Parameter Description
N/A Theshow ip eigrp topology command does not take arguments.
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Device# show ip eigrp traffic
Theshow ip eigrp traffic command displays the number of EIGRP packets sent and received. This command displays statistics o
hello packets, updates, queries, replies, and acknowledgments.
Command Parameter Description
N/A Theshow ip eigrp traffic command does not take arguments.
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Device# show ip interface [brief] [type] [number ]
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Theshow ip interface command displays information about the IP interfaces on a Cisco device.
Command Parameter Description
brief Keyword that tells a router or switch to display information about its interfaces in a brief
format.
type (Optional) Interface type. Allowed values include async, bri, dialer, ethernet,
fastethernet, fddi, hssi, loopback, null, serial, tokenring, and tunnel.
number (Optional) Port, connector, or interface card number. Some Cisco devices require both a slot
and port number in the formslot/port . If an interface number is specified, theshow ip
interfaces command displays information for the specified interface only.
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Device# show ip nat translations
Theshow ip nat translations command displays address translations that are active in the NAT table.
Command Parameter Description
N/A Theshow ip nat translations command does not take arguments.
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Device# show ip nat statistics
Theshow ip nat statistics command displays address translation statistics.
Command Parameter Description
N/A Theshow ip nat statistics command does not take arguments.
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Device# show ip ospf interface
Theshow ip ospf interface command displays the area ID, timer intervals (including the hello interval), and adjacency informatio
Command Parameter Description
N/A Theshow ip ospf interface command does not take arguments.
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Device# show ip ospf neighbor
Theshow ip ospf neighbor command displays OSPF neighbor information on a per-interface basis.
Command Parameter Description
N/A Theshow ip ospf neighbor command does not take arguments.
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Device# show ip protocols
Theshow ip protocols command displays information about routing protocols that are configured on the router, including routing
protocol timer information, networks with which the router is exchanging routing updates, and the devices from which the router is
receiving routing information.
Command Parameter Description
N/A Theshow ip protocols command does not take arguments.
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Device# show ip route [noalias]
Theshow ip route command displays the contents of the IP routing table.
Command Parameter Description
noalias Keyword that forces the router to display IP addresses, not IP aliases.
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Device# show ip route eigrp
Theshow ip route eigrp command displays the current EIGRP entries in the routing table.
Command Parameter Description
N/A Theshow ip route eigrp command does not take arguments.
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Device# show isdn active
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Theshow isdn active command displays current call information, including called number, the time until the call is disconnected,
AOC charging units used during the call, and whether the AOC information is provided during calls or at the end of calls.
Command Parameter Description
N/A Theshow isdn active command does not take arguments.
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Device# show isdn status
Theshow isdn status command displays the number of active calls and the status of layer 1, layer 2, and layer 3 connectivity
between the router and the ISDN switch. In the output, a layer 1 status of ACTIVE and a layer 2 status of
MULTIPLE_FRAME_ESTABLISHED indicates that the router is communicating with the ISDN switch.
Command Parameter Description
N/A Theshow isdn status command does not take arguments.
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Device# show mac-address-table
Theshow mac-address-table command displays the contents of the MAC address table.
Command Parameter Description
N/A Theshow mac-address-table command does not take arguments.
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Device# show port-security [interface interface] [address | {{begin | exclude |
include} expression}]
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Theshow port-security command displays the port security settings defined for the specified interface.
Command Parameter Description
interface interface (Optional) Interface for which you want to display the port security settings.
address (Optional) Keyword that tells the router to display all the secure addresses on all ports.
begin (Optional) Keyword that sets it so that the display begins with the line that matches the
specified expression.
exclude (Optional) Keyword that sets it so that the display excludes lines that match the specified
expression.
include (Optional) Keyword that sets it so that the display includes lines that match the specified
expression.
expression Expression that will be used as a reference point in the output.
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Device# show protocol access-list [access-list-identifier ]
Theshow protocol access-list command displays the contents of all ACLs configured for the specified protocol on a Cisco
device.
Command Parameter Description
protocol Protocol whose ACLs are to be displayed. For example, the show ip access-list
command displays only the IP ACLs configured on a router.
access-list-identifier (Optional) The name or number of a specific ACL. If this parameter is used, only thecontents of the specified ACL are displayed.
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Device# show running-config
Theshow running-config command displays the configuration information currently running in RAM on the device.
Command Parameter Description
N/A Theshow running-config command does not take arguments.
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Device# show spanning-tree [detail]
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Theshutdown command causes an administrative shutdown of the specified interface, disconnecting any calls that are in progress.
Theno form of this command enables the interface.
Command Parameter Description
N/A Theshutdown command does not take arguments.
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Device(config-if)# switchport access vlan vlan
Theswitchport access command assigns an interface to a VLAN.
Command Parameter Description
vlan vlan The VLAN that the interface is being assigned to.
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Device(config-if)# switchport mode {trunk | access | dynamic desirable | dynamic
auto}
Theswitchport mode command configures the VLAN mode for an interface.
Command Parameter Description
trunk Keyword that configures the port into permanent 802.1Q trunk mode and negotiates with the
connected device to convert the link to trunk mode.
access Keyword that disables port trunk mode and negotiates with the connected device to convert
the link to nontrunk.
dynamic desirable Keywords that trigger the port to negotiate the link from nontrunk to trunk mode. The port
negotiates to a trunk port if the connected device is in either trunk state, desirable state, or
auto state. Otherwise, the port becomes a nontrunk port, which is the default mode for all
Ethernet interfaces.
dynamic auto Keyword that enables a port to become a trunk only if the connected device has the state set
to trunk or desirable. Otherwise, the port becomes a nontrunk port.
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Device(config-if)# switchport nonnegotiate
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Theswitchport nonnegotiate command specifies that DTP negotiation packets are not sent on the layer 2 interface. The switch
does not engage in DTP negotiation on this interface. This command is valid only when the interface switchport mode is access or trunk
(configured by using the switchport mode access or theswitchport mode trunk interface configuration command). This
command returns an error if you attempt to execute it in dynamic (auto or desirable) mode. Use the no form of this command to return
to the default setting.
Command Parameter Description
N/A Theswitchport nonnegotiate command does not take arguments.
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Device(config-if)# switchport port-security [{mac-address mac-address} | {maximum
value} | {violation {protect | restrict | shutdown}}]
Theswitchport port-security command enables port security on an interface.
Command Parameter Description
mac address mac-address (Optional) Secure MAC address for the port. You can add additional secure MAC addresses
up to the maximum value configured.
maximum value (Optional) Maximum number of secure MAC addresses for the interface. The range is from 1
to 132. The default is 1.
violation (Optional) Keyword that sets the security violation mode or the action to be taken if port
security is violated. The default is shutdown.
protect Keyword that sets the security violation to protect mode. When port secure MAC addresses
reach the limit that is allowed on the port, packets with unknown source addresses are
dropped until you remove a sufficient number of secure MAC addresses to drop below themaximum value.
restrict Keyword that sets the security violation to restrict mode. In this mode, a port security
violation causes a trap notification to be sent to the network management station.
shutdown Keyword that sets the security violation to shutdown mode. In this mode, a port security
violation causes the interface to immediately become error-disabled, and an SNMP trap
notification is sent. When a secure port is in the error-disabled state, you can bring it out of
this state by entering theerrdisable recovery cause psecure-violation global
configuration command, or you can manually re-enable it by entering the shutdown and
no shutdown interface configuration commands.
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Device(config-if)# switchport trunk encapsulation {isl | dot1q | negotiate}
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Theswitchport trunk encapsulation command sets the trunk encapsulation method for the interface.
Command Parameter Description
isl Keyword that specifies that only 802.1Q trunking encapsulation is used.
dot1q Keyword that specifies that only ISL trunking encapsulation is used.
negotiate Keyword that tells the device to negotiate trunking encapsulation with a peer on the interface
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Device# telnet {hostname | ip-address}
The telnet command allows you to connect to a network host remotely.
Command Parameter Description
hostname Name of the host that you are connecting to.
ip-address IP address of the host that you are connecting to.
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Device# terminal editing
The terminal editing command enables the advanced editing features of Cisco IOS software. The no version of this command
disables the advanced editing features.
Command Parameter Description
N/A The terminal editing command does not take arguments or keywords.
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Device# terminal history size lines
The terminal history size command configures the command history buffer size for the current terminal session.
Command Parameter Description
lines Number of command lines that the device will record in its history buffer. The range is from 0
to 256. The default is 10.
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Device(config-router)# traceroute {hostname | ip-address}
The traceroute command allows you to display the route packets take to the specified host.
Command Parameter Description
hostname Name of the host that you are connecting to.
ip-address IP address of the host that you are connecting to.
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Device(config-router)# traffic-share {balanced | min}
The traffic-share command controls how traffic is distributed among IGRP load-sharing routes.
Command Parameter Description
balanced Keyword that specifies the distribution of traffic proportionally according to the ratios of the
metrics.
min Keyword that specifies the use of routes that have minimum costs.
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Device(config)# username name password password
Theusername command is used to establish a username-based authentication system.
Command Parameter Description
name The User ID. This is the host name of the remote router. It is case sensitive.
password The password assigned to all routers. It must be the same for both the remote router and
authenticating router.
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Device(config-router)# variance multiplier
Thevariance command defines the difference between the best metric and the worst acceptable metric when performing unequal-co
load balancing.
Command Parameter Description
multiplier The range of metric values that will be accepted for load balancing. Acceptable values are
nonzero, positive integers. The default value is 1, which means equal-cost load balancing.
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Device(config-router)# vlan vlan-number
Thevlan command creates a VLAN on a router.
Command Parameter Description
vlan-number The number of the VLAN being created.
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Device(config)# vtp {{mode [server | client | transparent]} | {domain domain-name
| {password password }}
Thevtp command configures VTP parameters on a router.
Command Parameter Description
mode [server | client |transparent]
VTP operating mode.
domain domain-name VTP domain name.
password password VTP password.
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