Solved: Importing route targets

gautamzone · ‎12-22-2009

Dear friends,

Just to give an example, lets take vrf A (source vrf) and vrf B (destination vrf where we are saying route-target import) and let x:y be the export route-target used by vrf A.

When i say route-target import x:y in vrf B, then what exactly am i importing?

Am i importing only routes for directly connected networks on vrf A and static routes redistributed into vrf A?

What about routes that are exported from other vrf's but set with the extcommunity that matches this route-target x:y. Are they also imported?

What about the other route-targets imported into vrf A? Do they also land into vrf B?

Thanks a lot

Gautam

Laurent Aubert · ‎12-22-2009

Hi Gautam,

When you configure route-target import x:y under a VRF, you actually import into the PE VPNv4 table all the VPNv4 prefixes which has one of their RT set to x:y.

To export a route, the PE needs first to add it into the VRF BGP table. So you need to redistribute those routes into the address-family ipv4 vrf sub-mode configuration. The way those routes are learned from the CE depends of the configuration: could be dynamic via BGP, OSPF,.. or static

An imported route is never exported back to the backbone.

HTH

Laurent.

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Laurent Aubert · ‎12-22-2009