Cisco Bug: CSCtc31711 - PMTUD sets Path destination to MTU 62, expire never
Feb 22, 2014
- Cisco IOS
Known Affected Releases
Symptom: Path MTU calculated at MTU 62. Certain host applications with DF-Bit were then unable to send traffic over the Tunnel. To illustrate when broken: show interface tunne0l: <snip> Path destination 192.168.1.1: MTU 62, expires never when broken After a shut/no shut of the tunnel interface traffic with DF-Bit set flows once again. show interface tunne0l: <snip> Path destination 192.168.1.1: MTU 0, expires never Conditions: Both local and remote routers were running 12.4(18a) tunnel path-mtu-discovery set on local peer only. Local router started PMTUD while the link on the remote peer router was down but before routing converged on the locall router.
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