Cisco Bug: CSCvs10677 - [IMR2] L2 loop resulting in PIM nbr flap and eventually invalid PIM RPF
Nov 22, 2019
- Cisco Nexus 9000 Series Switches
Known Affected Releases
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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Bug Details Include
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