Tx Hritter, mplsvpn 3 adjacency will be made between ce and pe.i worried whether how metric ospf affected in mpls scenario because there are intervening router (PE). will pe router additional cost/metric? between two site? i am creating like "ip ospf cost 10 on both ce router. of course by creating that metric in natural(Frame relay, ethernet, serial) the metric will be only 10. so what about MPLS? how to do that in common implementation even there is another router in between that naturally? tx a lot :)

Hi Jimmmy,

As far as i know when redistributing into OSPF, OSPF defaults the metric to 20 for redistributed IGP routes and 1 for BGP routes, on the other side when redistributing into BGP, the redistributed route metric is copied by default into the MED field. Accordingly you can't preserve the OSPF metric in L3VPN MPLS, as it will change to 1 by default on the second PE when redistributing back from BGP to OSPF to reach the second CE.

HTH, please rate if it does help,

Mohammed Mahmoud.

Redistribution of the OSPF routes into BGP and then back into OSPF on the other PE means that the routes are seen as inter-area or external by the CE. If you want the CE to see the OSPF routes as intra-area, you need to use a sham-link between the PEs.

Hope this helps,