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CoPP issues

Required by regulations to implement CoPP on our routers, I installed  the following configuration on a C2811 router  pair with integrated DSU/CSU cards connecting a point T1.  STAC compression(software) is configured on the serial interfaces  and the link is often congested.

>>ip access-list extended CoPP_CRITICAL

>>remark our control plane adjacencies are critical permit tcp

>>X.Y.10.0  eq tacacs any permit tcp X.Y.10.0

>>any eq 22 deny ip any any


>>ip access-list extended CoPP_IMPORTANT permit udp host

>>any eq snmp permit udp host X.Y.10.241 any eq snmp permit udp host

>>X.Y..26.1 eq ntp any deny ip any any


>>ip access-list extended CoPP_NORMAL

>>remark we will want to rate limit ICMP traffic permit icmp any any

>>echo permit icmp any any echo-reply permit icmp any any time-exceeded

>>permit icmp any any unreachable deny ip any any


>>ip access-list extended CoPP_UNDESIRABLE remark other management plane

>>traffic that should not be received permit udp any any eq ntp permit

>>udp any any eq snmptrap permit tcp any any eq 22 permit tcp any any eq

>>23 remark other control plane traffic not configured on router deny ip

>>any any


>>ip access-list extended CoPP_DEFAULT

>>permit ip any any



>>police 512000 8000 conform-action transmit exceed-action transmit

>>class CoPP_IMPORTANT police 256000 4000 conform-action transmit

>>exceed-action drop class CoPP_NORMAL police 128000 2000 conform-action

>>transmit exceed-action drop class CoPP_UNDESIRABLE police 8000 1000

>>conform-action drop exceed-action drop class CoPP_DEFAULT police 64000

>>1000 conform-action transmit exceed-action drop

This configuration severely degraded the IP traffic flow and I had to remove it. Not having any practical experince with CoPP I'm looking for help and suggestions on how to best implement in this scenario. Thanks


CoPP issues


I suggest you refer to this QoS design guide as an example of a CoPP policy to deploy on your router

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