MPLS VPN VRF Export Map

Lessons Discussion
3

Hi Chris,

It still has the implicit deny but when you use a route-map as an export-map, it only tells the router which route-targets to add. When you use a route-map with a neighbor for a routing protocol, it works as a filter for routes.

For example, this is the default route-target on PE1:

ip vrf CUSTOMER
 rd 1:1
 route-target export 1:1:

And we use this export-map:

PE1(config)#ip prefix-list CE1_L0 permit 1.1.1.1/32
PE1(config)#route-map EXPORT_MAP permit 10
PE1(config-route-map)#match ip address prefix-list CE1_L0

Then we end up with:

PE1#show ip bgp vpnv4 all 1.1.1.1/32 | include Extended
      Extended Community: RT:3:3 OSPF DOMAIN ID:0x0005:0x000000020200
PE1#show ip bgp vpnv4 all 11.11.11.11/32 | include Extended
      Extended Community: RT:1:1 OSPF DOMAIN ID:0x0005:0x000000020200
PE1#show ip bgp vpnv4 all 192.168.12.0/24 | include Extended
      Extended Community: RT:1:1 OSPF DOMAIN ID:0x0005:0x000000020200

Because of the implicit deny, the last two routes didn’t get route-target 3:3 but the default one (1:1).

Hope this helps!

Rene