Forum Discussion
Paedrig_69869
Nimbostratus
NimbostratusOSPF redistribute kernel uses 127.1.1.1 forward address
Hi All,
We are trying to advertise a virtual address into OSPF using the following imish config
router ospf 24
auto-cost reference-bandwidth 40000
bfd all-interfaces
redistribute kernel metri...
Just out of curiosity have you tried apply a route-map to filter outbound advertisements so that only the intended self/floating IP's are advertised? Not sure where the 127 address is coming from without seeing your entire config but this would be a quick way to prevent it from being advertised.
Paedrig_69869Thanks Fred, some testing has indicated that redistributing kernel routes with a route map that sets the next hop IP does change the behavior of the forward address.
I would imagine that using this in conjunction with a prefix list would allow only the desired addresses to be advertised though we haven't tested to this extent yet.
If there are specific things about our config that you think would be worth verifying please let me know and I'll see if I can post them.
Hi Paedrig, correct - you wouldn't necessarily need to set the next-hop however, simply filtering the outbound advertisement should work as intended. You can use both next-hop and the outbound filter in combination for the desired effect. Also, I would suggest as a best practice to filter inbound out the adjacent router, this would prevent any error advertisements in both directions.
Something like this should do the trick:
redistribute kernel route-map virtual-addresses-out
access-list virtual-addresses permit x.x.x.x/xx
route-map virtual-addresses-out permit 10 match ip address virtual-addresses
If you want to upload you config to iHealth and/or open a case I'd be happy to take a look at your config.