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Cisco Bug: CSCul24462 - FabricPath interface incorrectly programmed by PIXM after nbr reload

Last Modified

Feb 14, 2018

Products (5)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases

6.1(4) 6.1(4a) 6.2(2)S42

Description (partial)

Symptom:
In certain cases Fabricpath flood BD LTL could be incorrectly programmed on N7k device, resulting in multicast and broadcast traffic loss. This is seen on N7K-F248XP-25E line card when the N7k device is running NX-OS 6.1(4a) and 6.1(4).

Issuing "shut" / "no shut" for the affected interface on either side (N7k or N5k) recovers the interface from the issue.

Conditions:
In the current case the issue is seen if there is a directly attached N5k VPC+ system, and one of the VPC peers is being reloaded.
This issue is not specific to 6.2.6 although was observed in this release. This could occur in a fabricpath deployment when there exists multiple path to a fabricpath switch and one such switch is reloaded.  The issue is not easily reproduced, and occurs in certain cases where cumulative route change triggers are simulated.  In this particular case switch reload resulted in router port entry modification as well as switch routes being changed. The issue should most likely be observed only when router port entries are configured on the impacted vlan or per-vdc.

Related Community Discussions

N7K FabricPath can't ping same subnet VLAN
Anyone can help me ? I found problem about fabric path configuring  on Nexus7706. I can ping other host in different vlan but can't ping other host in same vlan (46) this below picture. Please suggest me.
Latest activity: Mar 12, 2015
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