[c-nsp] BGP vs OSPF (CE -> PE)

[Oliver Boehmer (oboehmer)]

>Hi Everyone,
>
>We typically use OSPF (CE/PE) so customer can advertise routes into their
>VRF - We have issues with failover (When customer site has 2 links) but
>the links go to different PE"s of ours (We only have agg's from carriers
>on certain PE's)..
>
>eg.
>
>Customer(vrf) has a site(foo) connected to PE A + B (PE B is "failover"
>link)
>
>Same customer has another site(bar) connected to PE B.
>
>Traffic from site "bar" to "foo" will go via PE B, which is not what we
>want...we have manipulated this to work via longer subnets (i.e. failover
>link advertising a /23 instead of a /24), but this isnt always feasible.
>
>Would BGP(Instead of OSFP) help in this situation...i.e. Can we
>manipulate how the routes are advertised(PE A/B) within the vrf more
>easily if the CE advertises via BGP vs OSPF? Or any other suggestions?

OSPF sham links have been introduced to help in this situation, but BGP is
certainly easier as it doesn't need those and you can manipulate the
policy using normal BGP attributes..

	oli