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Cisco Bug: CSCvv27817 - DHCP Unicast Packets wrongfully snooped / punted to CPU on FX

Last Modified

Sep 26, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases


Description (partial)

DHCP unicast renewal acks are NOT forwarded across the fabric to clients. (this traffic is sourced from port 67 destined to port 68)
Regular DORA works well, unicast ACKs are working as expect . (this traffic is sourced from port 67 destined to port 67)
For the DHCP renewals, we observe that they are incorrectly being punted to CPU as ISTACK_SUP_CODE_DHCP_SNOOP on the ingress leaf.

Unicast renewals forwarded from AVE to FX leaf, destined to port 68
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