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Cisco Bug: CSCuq19149 - mVPN - ME3800 acting as 'P' router is causing PIM adj to drop b/w PE's

Last Modified

Sep 14, 2019

Products (17)

  • Cisco ME 3800X Series Carrier Ethernet Switch Routers
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901-6CZ-FT-A Router
  • Cisco ASR 901-12C-FT-D Router
  • Cisco ME 3600X-24CX-M Switch
  • Cisco 7600 Series Route Switch Processor 720 with Multilayer Switch Feature Card
  • Cisco ASR 901-4C-F-D Router
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Known Affected Releases


Description (partial)

mVPN setup, ME3800 acting as P router flushes S,G entry. 
The S,G on an 'P' router maintains the pim adjacency for the hello packets exchanged on the default mdt. Although continuous pim hello's are seen on 'P' router sent from the PE routers, but still the mroute output displays the S,G entry being deleted and re-created, thereby causing PIM adjacency to go DOWN between the PE's.


If the mVPN setup comprises of an PRIMARY PE which is sending mcast traffic regularly and an BACKUP PE which is passive and only takes over when PRIMARY is DOWN, it was noticed that the BACKUP PE's S,G on 'P' router was getting flushed.

mVPN setup with ME3800 deployed as 'P' router.
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