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ASR1000 QOS on Portchan Subints‏

Hi Guys,

QOS is not "supported" on the ASR1K with Portchan Subints(egress), but there is a work-around using the "fragmentation" feature, where you create a dummy class-map for the physical Ints that are members of the PortChan, and then use "fragment" in the default-class of the policy-maps for the Portchan subints.

eg.

class-map intf-attach-point

policy-map main-intf-policy

class intf-attach-point service-fragment entire-policy

bandwidth remaining ratio 1

int g1/0/4

channel-group 1

service-policy out main-intf-policy

int g1/2/4

channel-group 1

service-policy out main-intf-policy

class-map match-any MATCH_DSCP_EF_CS3

match ip dscp ef

match ip dscp cs3

policy-map CHILD

class MATCH_DSCP_EF_CS3

priority percent 20

class class-default

fair-queue

policy-map PARENT

class class-default fragment entire-policy

shape average 3850000

service-policy CHILD

int port-channel1.601

encaps dot1q 601

ip addr 10.1.0.1 255.255.0.0

service-policy out PARENT

My question is, are there any negatives to using the fragmentation feature to deploy egress qos on portchan subints? Interested to hear from anyone who is actually using it in production?

Egress QoS support on Portchan Subints in IOS-XE is on the roadmap, but no confirmed date for release as yet - Am I better off waiting for it to be released?

Cheers.

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