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Cisco Bug: CSCvs10677 - [IMR2] L2 loop resulting in PIM nbr flap and eventually invalid PIM RPF

Last Modified

Nov 22, 2019

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

14.2(2.215)

Description (partial)

Symptom:
Traffic loss, since the BL is not sending PIM joins on the L3out. 
The reason PIM not sending joins is due to invalid RPF interface/ neighbor in PIM.

Conditions:
- IF FEX interfaces are used to replace the existing receiver, on the FEX interfaces STP was disabled.
- Sources are outside the Fabric, Receivers are deployed inside the fabric BLs. 
- When we are trying to replace existing receiver with FEX based receivers it is resulting in L2 loop.
- L2 loop keeps PIM busy causing PIM to drop hello packets resulting in neighbor-ship flap between BL and external Router.
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