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Cisco Bug: CSCut61985 - MPLSoDMVPN; Ping to spoke int. fails if dest. mask is /32

Last Modified

Jun 28, 2018

Products (25)

  • Cisco IOS
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ASR 901-6CZ-FS-D Router
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901S-4SG-F-D Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901S-2SG-F-AH Router
  • Cisco ASR 901S-2SG-F-D Router
  • Cisco ASR 901-6CZ-FT-A Router
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Known Affected Releases

15.4(2)S 15.4(3)S 15.5(3)S 15.6(1)S

Description (partial)

Symptom:
Packet forwarding succeeds between DMVPN spoke nodes when going over spoke-hub-spoke path but fails when when going over the direct spoke-spoke path.  
Forwarding over the direct spoke-spoke will fail when either the source or endpoint is a directly connected interface address on the spoke node within a VRF, the interface has a /32 mask and MPLSoDMVPN using 'mpls nhrp' is configured on the DMVPN tunnel interfaces.

Additionally, using Loopback interfaces to perform iBGP peering across the Spokes will also fail, irrespective of the netmask on the loopback interfaces since iBGP peering will still be done using /32 prefix.

Conditions:
MPLSoDMVPN [2547oDMVPN] setup with "mpls nhrp" configuration.
Requirement is to setup direct spoke-to-spoke Tunnels.

Related Community Discussions

<key>CSCut61985</key> - MPLSoDMVPNand59; Ping to spoke int. fails if dest. mask is /32
This is also a bug in VIRL IOSv.  
Latest activity: Feb 24, 2016
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