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Forum Discussion

Krishna_251070's avatar
Krishna_251070
Icon for Nimbostratus rankNimbostratus
Aug 07, 2018

OSPF stuck in Exstart

Hello, I am facing an issue with enabling OSPF between a Cisco Router and F5 LTM. The OSPF adjacency process is getting stuck at exstart phase. This is how my toplogy looks like: Cisco Router<-...
application delivery
BIG-IP
LTM
ospf
Krishna_251070's avatar
Krishna_251070
Icon for Nimbostratus rankNimbostratus
Aug 15, 2018

This issue was caused by ACL blocking unicast traffic between OSPF peers. The multicast address 224.0.0.5 was permitted in the ACL. That is reason why the adjacency state moved till EXSTART.

 

DBD packet exchange happens using the unicast addresses.