topic BGP filtering question in General Topics

BGP filtering question

Alex_Samad — Tue, 09 Jan 2018 04:32:24 GMT

Hi

Quick question, pretty sure I know the answer.

But I want to redistribute some of the OSPF routes I have into BGP.

So I create a redist profile, say the source is OSPF

then I can use the BGP export filtering to stop what I don't want out.

So lets say I have in my ospf table

10.10.10.0/24

10.10.20.0/24

10.10.30.0/24

1.1.1.50/32

1.1.1.51/32

1.1.1.55/32

1.1.1.70/32

and my export has

allow 1.1.1.0/24 not exact

then I would only advertise

1.1.1.50/32

1.1.1.51/32

1.1.1.55/32

1.1.1.70/32

Thanks

Alex

Re: BGP filtering question

9t89m8fu — Tue, 09 Jan 2018 12:45:04 GMT

Correct, but bear in mind BGP export filters are per-peer or peer group. What controls what passes from the OSPF RIB to the BGP RIB (LOC-RIB) is your redistribution profile.