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Cisco Bug: CSCsz52739 - DS:COPP:Unicast DHCP resp pkt destined to sup hits default COPP policy

Last Modified

Mar 05, 2018

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

4.1(5)E2

Description (partial)

Symptom:

DHCP response packets from the DHCP server are passed through default CoPP policy. 
Depending on how much traffic is hitting the default CoPP policy these DHCP response packets
can be dropped.

Conditions:
Nexus 7000 configured to act as a DHCP relay agent.

Workaround(s):
Create an access-group matching DHCP packets, and attach that to class-map cop-system-class-important. This way DHCP packets go through the important class of traffic, and wouldn't get dropped as we have enough rate assigned for that class.

Actually this issue has now been resolved in 4.2.1. However if an upgrade to 4.2.1 is done to avail of the updated policies, 'setup' has to be explicitly run in order to have the new copp policies in effect.
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  • Status
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