EVPN host routes advertised to external network

[edbucher]

I have a simple EVPN based campus LAN (IOS XE 17.6.3) that connects L3 to a legacy network (BGP<>EIGRP redistribution) for migration purposes. I've noticed /32 host routes are being advertised to the legacy network derived from the /24 EVPN VLAN. I understand the BGP route-type 2 routes and the purpose within the EVPN network. I don't understand why both /24 route and /32 host routes would be advertised into the legacy EIGRP network? Is this necessary or what do I need to do to resolve these /32 routes from being advertised?

Thanks in advance for your time!

[Harold Ritter · Accepted solution]

Hi @edbucher ,

It depends what your bgp to eigrp redistribution looks like. Filtering these routes should be pretty straightforward.

Regards, 

[edbucher]

Currently no filters just straight redistribution. So seeing host routes is normal in this scenario? I will filter them out I just wanted to make sure.

[Harold Ritter]

Hi @edbucher ,

Yes, seeing the host routes is normal and expected.

Regards,