[j-nsp] BGP import policy to accept prefixes from advertising AS only.

[John Senior]

Hi all,

I am sure I came across this a while ago but can't now find it, I don't think
I imagined it!

Anyway, is it possible to create a BGP import policy statement that will
only accept prefixes from the advertising AS without having to specify
the AS number?  I.e. can I create a policy statement that is generic that
I can apply to a bunch of peers without having to create a specific one
for each peer?

e.g.

policy-statement only-allow-routes-originating-in-peer-as {
	term 10 {
		from {
			as-path "^originating AS number$"
		}
		then accept;
	term 20 {
		then reject;
	}
}

protocols bgp {
	group ebgp-peer1 {
		peer-as 12345; 
		import only-allow-routes-originating-in-peer-as;
                        blah blah etc etc.
	}
	group ebgp-peer2 {
		peer-as 23456;
		import only-allow-routes-originating-in-peer-as;
                        blah blah etc etc.
	}		
}

For peer1 I only want as-path ^12345$ and similarly for peer2 I only want ^23456$.

Would I achieve this with configuration groups?

All the best,

John.
--
John Senior <js at irishbroadband.ie>