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Cisco Bug: CSCul88331 - Nexus 3548 is copying IPv4 unicast packets with proto PIM (103) to CPU

Last Modified

Feb 27, 2018

Products (2)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3548 Switch

Known Affected Releases

6.0(2)A1(1c)

Description (partial)

Symptom:High CPU condition and/or high number of IPv4 Unicast packets sent to CPU.
PIM adjacency instability.

Conditions:IPv4 unicast packets sent to CPU are traffic between First-Hop-Router(FHR) and RP, with IP protocol-type is PIM (103). This includes PIM-Registration (from FHR to RP) as well as PIM-Registration-Stop (from RP to FHR)

As the above-mentioned unicast packets and PIM control-plane packets are classified under the same class in CoPP, with excessive unicast traffic there is higher chance for PIM control-plane packets to get dropped by CoPP hence resulting in PIM adjacency instability.
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