Cisco Bug: CSCvs58147 - ASR5500 wrong ipv6 fragments handling with "policy ipv6 tunnel mtu exceed fragment inner"
Jan 13, 2020
- Cisco ASR 5000 Series
Known Affected Releases
Symptom: ASR5500 is double fragmenting ICMPv6 packets, i.e. fragmenting the IPv6 fragments if they are bigger than configured ipv6 MTU (data-tunnel mtu) under APN. Conditions: Multiple conditions should be met to face this deffect: - ASR5500 without VPP (not iCUPS setup). Possible ASR5000 is affected as well. - APN configured to allow packets bigger than the configured MTU without dropping and sending ICMP packet too big, i.e. "policy ipv6 tunnel mtu exceed fragment inner" configured under APN. - APN configured with smaller IPv6 MTU (data-tunnel mtu) than the one configured on the peer
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Bug Details Include
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