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Cisco Bug: CSCul53494 - vzw 6.2.6 EFT: PIM over GRE not working

Last Modified

Feb 23, 2018

Products (8)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases

6.2(10) 6.2(5.41)S4

Description (partial)

IP multicast ping over GRE tunnel doesn't work. The ping packets are getting dropped at the tunnel destination.

The first two (or few) packets are reaching SUP with proper SHIM header at the remote side until (S,G) route is installed in the hardware.  All further packets are going to hit this (S,G) and punt to SUP without SHIM header, which caused these packets to be dropped by packet manager.  This is a special case where we have (S,G) with punt flag and no OIFs associated with the route. Problem is only there for tunnel interface which needs a decap at the tunnel end. Multicast ping over non-tunnel interface will not have this problem.
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