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Configuring Routing Instances for VPNs on the PE Routers

Both PE routers service VPN-A, so you must configure one routing instance on each router for the VPN in which you define the following:

Route distinguisher, which must be unique for each routing instance on the PE router. It is used to distinguish the addresses in one VPN from those in another VPN.
Instance type of vrf, which creates the VRF table on the PE router.
Interfaces connected to the CE routers.

VRF import and export policies, which must be the same on each PE router that services the same VPN. Unless the import policy contains only a then reject statement, it must include reference to a community. Otherwise, when you try to commit the configuration, the commit fails.

Note: In this example, a private AS number is used for the route distinguisher. This number is used for illustration only. When you are configuring VPNs, you should use an assigned AS number.

Routing between the PE and CE routers, which is required for the PE router to distribute VPN-related routes to and from connected CE routers. You can configure a routing protocol—BGP, OSPF, or RIP—or you can configure static routing.

On Router PE1, configure the following routing instance for VPN-A. In this example, Router PE1 uses RIP to distribute routes to and from the CE router to which it is connected.



[edit]
routing-instance {


VPN-A {
instance-type vrf;
interface ge-1/0/0.0;
route-distinguisher 65535:0;
vrf-import VPN-A-import;
vrf-export VPN-A-export;


protocols {


rip {


group PE1-to-CE1 {
neighbor ge-1/0/0.0;
}


}


}


}


}

On Router PE2, configure the following routing instance for VPN-A. In this example, Router PE2 uses OSPF to distribute routes to and from the CE router to which it is connected.



[edit]
routing-instance {


VPN-A {
instance-type vrf;
interface so-1/2/0.0;
route-distinguisher 65535:1;
vrf-import VPN-A-import;
vrf-export VPN-A-export;


protocols {


ospf {


area 0.0.0.0 {
interface so-1/2/0.0;
}


}


}


}


}

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