Evacuation of the queues on Cisco 6504-E and 6509-E Cisco line cards

Hello

In our network environment, we get the following configuration:

Cisco 6509-E(Sup-2T) as the main switch equipped of line card module WS-X 6848-SFP (1 GE)

Cisco 6504-E (VSS-720-10 G Sup) as long as the service of distribution layer switch equipped WS-X 6704-10GE line card module

.

Time modules line cards end Layer 3 connections from the layer of access/core.

The QoS trust status is ""DSCP ' on line card interfaces and 6504-E 'mls qos trust dscp' is explicitly configured to trust the DSCP values. "           As is clear from interface capacity output below, "QoS queueuing" mode on both cards line is "CoS" only, and DSCP evacuation lines is not available in interface ' wrr-tail ' configurations. Similar problem exists on the interfaces of channel member of port on the main switch Sup - 2 t as well.

CORE01 #sh int gig2/1 cap

GigabitEthernet2/1

Model: WS - X SFP-6848

Type: 1000BaseSX

QOS scheduling: rx-(2q8t), tx-(1p3q8t)

Queueing QOS mode: rx-(cos), tx-(cos)

VSS01 #sh int t1/2/1 cap

TenGigabitEthernet1/2/1

Model: WS - X 6704-10GE

Type: 10Gbase-LR

QOS scheduling: rx-(8q8t), tx-(1p7q8t)

Queueing QOS mode: rx-(cos), tx-(cos)

CORE01(Config-if) #wrr - queue?

minimum bandwidth of WRR bandwidth set with weights or percentages

cos-map set up cos-sheet for a queue threshold ---> Cos map only no. DSCP

the queue limit configure the queue limit

detection of random set up the random detection

the bandwidth of the SRR maximum queue set up with weights of form or

percentages

tail-drop threshold thresholds configure queue

VSS01(Config-if) #wrr - queue?

minimum bandwidth of WRR bandwidth set with weights or percentages

COS-map set up cos-sheet for a queue threshold---> Cos only no. DSCP map

the queue limit configure the queue limit

detection of random set up the random detection

tail-drop threshold thresholds configure queue

In the above scenario, how the evacuation of the queues should be applied and what are best practices? If 'wrr-tail' is not supported for DSCP, it's recommended to set up "Political map" for evacuation queues and/or any other configuration of queues and then apply the policy of the outgoing evacuation on the interface function. Also, if the queue of political output card config is used, this allows for all the other DSCP / COS line cards in the system, so that the configuration is compatible with the network of 6500.

Thank you and best regards,

Mohan

:

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Poster

My understanding is that you use wrr-queue cos-card as you would be for the CoS values understand the DSCP values have been mapped in these CoS values.

If you look at figure 2-25, in the reference I provided, you will see 'Final internal DSCP is mapped to CoS' and ' "DSCP-CoS > rewrite" when dealing with exit port QoS. "

Tags: Cisco Network

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