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Cisco Bug: CSCus13433 - N9K: Packets Destined to SVI MAC Are Dropped When Transparent Bridging

Last Modified

Aug 18, 2017

Products (11)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 9504 Switch
  • Cisco Nexus 3164Q Switch
  • Cisco Nexus 9332PQ Switch
  • Cisco Nexus 9508 Switch
  • Cisco Nexus 93128TX Switch
  • Cisco Nexus 9372TX Switch
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Known Affected Releases

6.1(2)I3(1)

Description (partial)

Symptom:
Packets destined to SVI MAC address are dropped in Layer 2 only VLAN when transiting the Nexus 9000 which owns the destination mac address  on another SVI.

If traffic is destined to peer IP SVI mac address, Nexus 9k1 that receives the packet bypasses bridging, punts it  to CPU, routes L2 packet to peer SVI.

This behavior is applicable to 9300 (NFE) and 9500 with 95xx,96xx,94xx line cards

This bug is not applicable to 9200 , 9300-EX and 9500 with 9700-EX line cards

Conditions:
Traffic received on L2 only vlan, destined to its own mac address of another SVI that this box owns.

Likely scenarios to see this condition include:
- transparent firewall bridging
- hair pinning traffic
- L2 load balancers
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Bug Details Include

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