QoS WRED C9500/C9600

[MATTHIAS SCHAERER]

I try to add WRED to a policy-map on these switch types. Here's the policy-map, based on qos-groups.

policy-map QPM_Egress
description QoS Queuing/Marking on HW Interface to MPE
class QCM_QG1_Prio1
priority level 1 percent 1
class QCM_QG2_Prio2
priority level 2 percent 2
class QCM_QG8_BestEffort
bandwidth percent 97
random-detect dscp-based
random-detect dscp CS1 percent 8 40
random-detect dscp CS2 percent 16 40

switch-01(config-if)#service-policy output QPM_Egress
Unsupported qos-group filter for wred configuration in class QCM_QG8_BestEffort policy QPM_Egress

I can't find a way to add WRED to any queue. Tried various configuration variations, no success so far. Does someone have a running example on 17.3.x versions? Any hint is appreciated.

[balaji.bandi · Accepted solution]

I do not have access CAt 9500 to test this :

Look example :

WRED Configuration Example

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9500/software/release/17-3/configuration_guide/qos/b_173_qos_9500_cg/configuring_weighted_random_early_detection.html#concept_n2x_13q_p1b

[MATTHIAS SCHAERER]

Thanks for pointing me to the doc again (I read it before, but...). Basically the conclusion is: QoS-Groups are not supported in conjunction with WRED.  That's sad but I have my workaround using DSCP as matching argument.