S6C5 – Dialer Profiles

Chapter Outline

• 5.1 Legacy DDR• 5.1.1 Legacy DDR with a single destination• 5.1.2 Legacy DDR with multiple destinations• 5.1.3 Rotary groups overview• 5.1.4 Using rotary groups• 5.1.5 Configuring rotary groups• 5.1.6 Configuring ISDN for dialer rotary groups• 5.1.7 Asynchronous interface groups• 5.1.8 Legacy DDR limitations• 5.2 Dialer Profiles• 5.2.1 Overview of dialer profiles• 5.2.2 Configuring dialer profiles• 5.2.3 Dialer pools• 5.2.4 Placing calls with dialer profiles• 5.2.5 Receiving calls with dialer profiles• 5.2.6 Using dialer profiles with ISDN B channels• 5.2.7 Dialer map class

Legacy DDR Has Support For

• Frame Relay• The International Organization for Standardization

Connectionless Network Service (ISO CLNS)• The Link Access Procedure Balanced (LAPB)

protocol• Snapshot routing• All routed protocols that are supported on Cisco

routers.• BAD NEWS IS: legacy DDR's limitations can

adversely affect growth.

DDR Limitations

• Locks a physical interface into one configuration. – For example, DDR BRI0 can have only one Internet

Protocol (IP) address, one encapsulation type, and one set of dialer timers.

• Legacy DDR configuration uses dialer map statements– The Basic Rate Interface (BRI) can only dial multiple

hosts but must use same Point-to-Point Protocol (PPP) and dialer idle-timeout values when connected

Alternative: DDR with dialer profiles

Dialer Interfaces

• Allows you to propagate an interface configuration to multiple interfaces– Interface dialer 0

• Int bri 0– Dialer rotary-group 1

• Int bri 1– Dialer rotary-group 2

• Physical interfaces inherit the dialer interface configuration parameters.

Hunt Groups

• Incoming calls use first number in group of numbers that is available

• Used for customer access numbers

• Can also be used for outgoing calls– Console line can’t be part of a rotary group

Commands

• Dialer int 0– Ip address 123.23.2.1 255.255.0.0 secondary– IP address 142.1.2.1 255.255.0.0– No ip directed broadcast– Dialer in-band– Dialer idle-timeout 180– Dialer fast-idle 80– Dialer-map ip 122.1.1.1 name Godzila 1132222– Dialer-group 2– PPP authentication chap

Configuring ISDN for Dialer Interface

• A physical interface can belong to only one dialer rotary group• Dialer rotary-group command can be used with any dial-up

interface– async, BRI, PRI, and serial.

• Some of the configuration may still have to perform on the physical interface– separate SPIDs will have to be entered at each of the physicalBRI

interfaces.

• Ask your provider for one phone number to be used as a hunt group– Using one number requires only one set of dialer map statements on

the remote routers

Asynchronous Interface Command

• Configures a "group" interface.

• Can configure the group interface to include multiple asynchronous interfaces as members.

• Router (config)#interface group-async

• Router (config-if)# group-range 1 8– Note: Interfaces can’t be configured separately

Dialer Profiles

• Dialer profiles separate the logical configuration from the interface that receives or makes calls– Defines encapsulation– Access control lists (ACLs)– Turns features on/off

• Logical and physical configurations are dynamically bound to each other on a per-call basis

• Physical interface can be used by multiple dialer interfaces

Configuring Dialer Profiles

• When using dialer profiles, the IOS will not allow configuring the dialer interface with a dialer map command– Dialer map command maps the phone number to an IP

address and identifies the remote host's name for the purposes of CHAP or PAP authentication

• Use the dialer string command with dialer profiles– (config-if)#Dialer-string stringnumber– (config-if)# Dialer remote-name username

• Physical interface can belong to many pools

Dialer Profiles Allow

• You can configure B channels of an ISDN interface with different IP subnets or IPX networks.

• You can use different encapsulations on B channels of an ISDN interface.

• You can set different DDR parameters for B channels of an ISDN interface.

• You can optimize the use of available ISDN B channels by letting ISDN BRIs belong to multiple dialer pools.