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Cisco Bug: CSCut57290 - Egress LER TTL propagation misbehaviour in per-ce label allocation mode

Last Modified

Feb 21, 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 901S-2SG-F-D Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901S-2SG-F-AH Router
  • Cisco ASR 901-6CZ-FT-A Router
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Known Affected Releases

15.4(3)S 15.5(1)S

Description (partial)

Symptom:
TTL propagation is disabled for customer's traffic (no mpls ip propagate-ttl forwarded).
When per-ce label allocation mode is enable for VRF, we see our core-interface IP of egress LSR in the traceroute list

CE-13#traceroute 20.20.20.1

Type escape sequence to abort.
Tracing the route to 20.20.20.1

  1 192.168.1.1 0 msec 0 msec 0 msec
  2 10.3.0.2 0 msec 8 msec 0 msec  <<-------- core-faced interface IP
  3 192.168.2.2 0 msec *  0 msec

We should not see core-faced IP in the path

Conditions:
Per-CE mode enabled

mpls label mode all-vrfs protocol bgp-vpnv4 per-ce
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