Thursday, February 8, 2018

[Cisco] How to enable OSPF "passive-interface default" without breaking the connection?

I've noticed that the "no passive-interface <interface>" is not accepted before the "passive-interface default" command is given. Running the "passive-interface default" command turns down OSPF on all interfaces before you can exempt specific interfaces from it though, so it seems like it will always break your connection.

Does anybody know of a way to define which interfaces you want to remain active before disabling all others?

Update: I just tried copying and pasting the whole block of commands, and this seems to work, as apparently the interface in question is re-enabled before the hold time expires, so the neighbor doesn't end up going down. Slightly annoying, but works for now.



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