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Cisco Bug: CSCvr99132 - SPANed multicast packet reduced TTL

Last Modified

Apr 28, 2020

Products (1)

  • Cisco Catalyst 9300 Series Switches

Known Affected Releases

16.9.4

Description (partial)

Symptom:
Cat9k switch is configured for port mirroring [SPAN] and there is L2 multicast traffic passing through the port that is being mirrored.
This L2 multicast traffic passing through the switch will have original TTL value retained however packet copied by port mirroring [SPAN] feature will have TTL value decremented by 1 when egressing on SPAN destination port as opposed to when egressing on the original port as per L2 forwarding table.

Conditions:
L2 Multicast
SPAN
Cat9k
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