PFSense HA & OSPF Question
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Hi all
Hopefully a simple question & answer but struggling to find the right answer and cannot find any previous threads with the same question.
We are planning on using PFSense HA (CARP, PFSync & XMLRPC) between two Netgate 1541 appliances. We use OSPF (single area) within our network for route distribution between two datacentres (both with PFSenses as the router) and local SonicWALL's for remote site connectivity.
When setting up OSPF on the PFSense appliances, should the Router ID (RID) be the same on the active/standby unit or unique? Given the FRR OSPF service doesn't start on the standby appliances until/unless a failover event occurs, my thinking would be that the same Router ID could/should be used on both nodes but want to confirm.
Thanks
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@stowemotion59 You can use the same router ID or different. It really doesn't matter to OSPF. If you use a different router ID the other neighbors can tell at a glance which router they are actually establishing adjacency with.
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@Derelict Thanks for confirming. Would having the same router ID cause any issues during a failover event, if in the process of exchanging information with a neighbour? I'm thinking that when a failover occurs, the neighbour could see a response with a different sequence number than what it expected and cause a 'SeqNumberMismatch'.
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@stowemotion59 It is an entirely new OSPF session requiring a complete reconvergence so it should be fine.
