Support for CPU traffic policy

The default EOS Copp only provides protocol level traffic policy, for example, the maximum throughput of bgp traffic destined to the cpu. But there is no granularity of source address. So this feature - Support for CPU traffic policy is for this purpose. 

Arista EOS: Change the default shape and bandwidth of CoPP class

The purpose of CoPP is to protect the CPU from unnecessary or malicious packets. Arista EOS has a default CoPP set with pre-defined bandwidth and shape.

R1#sh policy-map type control-plane copp-system-policy
Service-policy input: copp-system-policy
  Number of units programmed: 8
  Hardware programming status: Successful

  Class-map: copp-system-arp-inspect (match-any)
       shape : 250000 kbps
       bandwidth : 25000 kbps

<....>

Most of the class names are intuitive, some need a little explanation. 

• l3destmiss - unicast routed packets but no ARP info, need ARP resolution. 
• l3lpmoverflow - ip broadcast destined to router???
• linklocal - multicast packets to 224.0.0.*
• l3slowpath - header option

How to change:

bn302.15:27:12(config)#policy-map type control-plane copp-system-policy

bn302.15:27:29(config-pmap-control-plane-copp-system-policy)#class copp-system-l3destmiss

bn302.15:27:43(config-pmap-c-control-plane-copp-system-policy-copp-system-l3destmiss)#shape kbps 999999

bn302.15:27:49(config-pmap-c-control-plane-copp-system-policy-copp-system-l3destmiss)#bandwidth kbps 88888

Policy map changes are applied when existing configuration mode. Use 'abort' to ignore any changes. 

How to verify:

bn302.16:47:57#show policy-map interface control-plane copp-system-policy

....

  Class-map: copp-system-l3destmiss (match-any)

       shape : 999999 kbps

       bandwidth : 88888 kbps

bn302.15:29:48(config-cp)#sh platform jericho copp mapping | egrep 'Shape|destmiss'

                         Class name   SysPhyPort First Voq# Total Voqs Bandwidth(kbps) Shape(kbps)

             copp-system-l3destmiss           36       1680       0-40             250        2500