All Rights Reserved © Alcatel-Lucent 2007 Quality of Service-QOS Carlos Pereira Senior Communications Consultant Alcatel-Lucent 3 October 2007

All Rights Reserved © Alcatel-Lucent 2007

Quality of Service-QOS

Carlos Pereira

Senior Communications Consultant

Alcatel-Lucent 3 October 2007

All Rights Reserved © Alcatel-Lucent 2007VF UK EDN RFI Presentation| September 2007

2. Hardware Queues-6800-9000

3. Recommendations

4. Questions?

1.TCP/IP Where in the packet?

User-Group


TCP/IP Protocol Stack

VERS LEN Type of Service Total Length

Identification Flags Fragment Offset

TTL Protocol Header checksum

source IP address

destination IP address

Options & padding

DATA


IEEE 802.1Q/P/DSCP

SFD SADAType orLength

Data CRC

SFD SA(6)

DA(6)

TypeVLAN

(2)Data(1500)

NewFCS(4)

VLANID(2)

Standard Ethernet or 802.3 Format: max. size 1518 bytes

Basic 802.1Q Format: max. size 1522 bytes

Fixed value identifying frame as a VLAN frame

Variable value identifying VLAN that frame is for

Including 3 bits reserver for CoS

802.1q frame is 4 byteslonger. CRC covers new

longer frame

Type orLength

(2)


QOS -Trusted and Untrusted Ports

> Trusted ports- preserve the P or DSCP settings in the Data flow.

> Untrusted Ports strip QOS settings on Data flows to the port default, or QOS rule.

> Trusted ports normally at Core of network, ( can also be at edge)


Queues

The OmniSwitch 9000 and the OmniSwitch 6850 provide 8 Class of Service (CoS) Queues per egress port for prioritizing and scheduling traffic .

- Traffic is assigned a CoS queue based on it matching a QoS policy rule that has priority

assignment as an action of the rule.

- Traffic received on a trusted port is assigned a CoS queue based on the DSCP value for IP

traffic or based on the 802.1p value for non-IP traffic.

- Traffic received on an untrusted port is assigned a QoS queue based on the default priority

defined for the ingress port on which the traffic is received.


68/9000 QOS

Default

• 8 COS queues per egress port

• 802.1p used to select queues, TOS used for IP packets

• Strict priority for scheduling

Configured by QoS ACL commands

• Condition

• Action

• Rules


68/9000 QOS

QoS Policies

• Classification on L1/L2/L3/L4 (IPV6 included)• Enqueuing in one of the 8 COS queues

Actions

• Drop frames• Change queuing priority• Update TOS/Diffserv and/or 802.1P priority tags• 802.1p/TOS/Diffserv mapping• Per COS max bandwidth (64K bps)• Statistics (# of packets, # of bytes)• Ingress policing / Egress shaping• Multi-actions support


De-queuing-Egress

Choice between 3 Algorithms Strict Priority

Starting w/ highest priority first, Queues are serviced until empty

Weighted Round Robin (packet based) Each queue to indicate how many packet to be serviced per interval Weight configurable 0-15

– Value of 0 to indicate the queue is to be considered Strict Priority

Deficit Round Robin (bandwidth based) Each queue to indicate how many chunk (10KB) to be serviced per time

interval Weight configurable 0-15

– Value of 0 to indicate the queue is to be considered Strict Priority


QOS LOG - have I got it right?

policy rule

Configures a policy rule on the switch. A rule is made up of a condition (for classifying incoming traffic)

and an action (to be applied to outgoing traffic).

policy rule rule_name [enable | disable] [precedence precedence] [condition condition] [action action]

[validity period name | no vlaidity period] [save] [log [interval seconds]] [count {packets | bytes}]

[trap | no trap]


QOS-CLI


Upcoming QOS enhancements

Auto-Qos on NMS traffic - Auto NMS prioritizes NMS traffic to the switch and aims to alleviate access problems to the switch under DOS attacks. NMS traffic is identified as SSH(TCP Port 22), Telnet(TCP Port 23), Webview (HTTP Port 80) and SNMP(TCP port 161). Each of the above traffic patterns are switched into different queues to maximize the possibility of making the switch manageable/accessible via at least one method(viz. SSH, Telnet, Webview or SNMP

Auto-Qos on CSBU appliances - By default the switch will trust all traffic detected as originating from CSBU IP phones. Detection is achieved by matching on the MAC address range used by CSBU IP phones. The MAC address range used by the CSBU IP phones are 00-80-9F-54-xx-xx — 00-80-9F-64-xx-xx and 00-80-9F-66-xx-xx — 00-80-9F-6F-xx-xx. Additionally the user can specify up-to 4 MACs or MAC ranges that need to be accorded the same QoS as the CSBU IP phones, by specifying the list in the special MAC group


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All Rights Reserved © Alcatel-Lucent 2007 Quality of Service-QOS Carlos Pereira Senior Communications Consultant Alcatel-Lucent 3 October 2007