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Cisco Bug: CSCvs94850 - STATIC GW-MAC not added to F4 HW MAC table once GW-MAC purge threshold limit was exceeded

Last Modified

Mar 27, 2020

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

8.4(2.222)

Description (partial)

Symptom:
GW-MAC added as STATIC entry in F4 HW MAC table (even though SVI is up)

Conditions:
From 8.4.2, if GW-MAC gets repeatedly purged from HW MAC table, and this exceeds the threshold (like more GW-MAC on a particular vlan is purged more than 10 times in last 300 seconds), then GW-MAC is added as STATIC MAC in HW MAC table - to keep system stable in the event of such RMAC storm attacks.

Current issue happens only on F4 HW MAC tables in this scenario.
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