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Cisco Bug: CSCuj48815 - MPLS forwarding path: ICMP 3/4 message is not sent back to the Sender

Last Modified

Sep 14, 2018

Products (6)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco IOS XR Software
  • Cisco ASR 9922 Router
  • Cisco ASR 9010 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router

Known Affected Releases


Description (partial)

Symptom:The Cisco ASR9000 does not send the following message back to the source:
Internet Control Message Protocol (ICMP) destination unreachable/fragmentation needed under MPLS environment.

Conditions:The issue is observed on Cisco ASR9000 and MPLS configuration is running,
moreover it meets all of the following conditions.

1. Ingress Interface MTU is bigger than Egress Interface MTU
2. Ingress LC and Egress LC are different LC.
3. Engress LC is Trident LC.The issue is observed on Cisco ASR9000 and it uses MPLS configuration.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
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