Symptom
OSPFv3 adjacencies fail to establish with neighbours that are sending router LSAs larger than the interface MTU, hence resulting in fragmented IPv6 packets.
Conditions
LSA larger than outgoing interface MTU
This is not seen where the device transmitting the large LSA is an ASR9k and the receiver is a CRS-3.
Seems to affect:
ASR9k -> ASR9k
CRS -> ASR9k
CRS -> CRS
Workaround
Increase interface MTU > largest LSA
Further Problem Description
This fix resolves the issue for CRS1,3.
