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Cisco Bug: CSCvi12032 - [N7k M3] GRE tunnel do not forward unicast/mcast traffic

Last Modified

Nov 14, 2019

Products (15)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco MDS 9710 Multilayer Director
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco MDS 9148S 16G Multilayer Fabric Switch
  • Cisco MDS 9250i Multiservice Fabric Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco MDS 9396S 16G Multilayer Fabric Switch
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Known Affected Releases


Description (partial)

In case that GRE tunnel is configured on the M3 card, unicast or multicast traffic might be incorrectly processed by the box and traffic destined to tunnel will be dropped, connectivity outside of the tunnel works fine. Issue been reproduced in case that underlying transport of tunnel is VLAN interface, in case of L3 interface, GRE tunnel work fine.

NOTE:Control plane protocols like for example OSPF will have problem to established adjacency over the tunnel (stuck in INIT state on one peer)

GRE tunnel configured on the M3 card with SVI in underlay .OSPF and PIM on GRE Tunnel does not work.
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