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Cisco Bug: CSCul55038 - PE-LNS : ICMPV6 message "too big" not sent

Last Modified

Apr 17, 2019

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.2(4)S 15.3(0.1) 15.3(3)S 15.4(1)S

Description (partial) 

Symptom:
In mpls-vpn scenario, when the size of packet coming from core network  is bigger than mtu set on CE facing interface, the expected ICMPv6 TOO_BIG fail to return.

Conditions:
1. packet is bigger than mtu on CE facing interface.
2. the packet come from core mpls network and try to go through CE facing interface.
3. the issue is found on PE in mpls-vpn scenario.
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