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Example: Configuring Policy-Based Export for an Overlapping VPN

In Layer 3 VPNs, a CE router is often a member of more than one VPN. Figure 6 illustrates the topology for the configuration example in this section. The configurations in this section illustrate local connectivity between CE routers connected to the same PE router using BGP.

The configuration statements enable the VPN AB Router CE2 to communicate with the VPN A Router CE1 and the VPN B Router CE3, both directly connected to the Router PE1. VPN routes that originate from the remote PE routers (the PE2 Router, in this case) are placed in a global Layer 3 VPN routing table (bgp.l3vpn.inet.0) and routes with appropriate route targets are imported into the routing tables, as dictated by the VRF import policy configuration.

Figure 6: Configuration of Policy-Based Export for an Overlapping VPN

Image g017003.gif

Configuring Router PE1

This section describes how to configure Router PE1 in the backbone entity for this overlapping VPN by means of policy-based export.

Configure the routing instances for VPN-A, VPN-AB, and VPN-B:



[edit]
routing-instances {


VPN-A {
instance-type vrf;
interface fe-1/0/0.0;
route-distinguisher 10.255.14.175:3;
vrf-export A-out;
vrf-import A-in;


routing-options {
auto-export;


static {
route 1.1.1.1/32 next-hop fe-1/0/0.0;
route 1.1.1.2/32 next-hop fe-1/0/0.0;
}


}


}




VPN-AB {
instance-type vrf;
interface fe-1/1/0.0;
route-distinguisher 10.255.14.175:9;
vrf-export AB-out;
vrf-import AB-in;


routing-options {
auto-export;


static {
route 1.1.3.1/32 next-hop fe-1/1/0.0;
route 1.1.3.2/32 next-hop fe-1/1/0.0;
}


}




VPN-B {
instance-type vrf;
interface fe-1/0/2.0;
route-distinguisher 10.255.14.175:9;
vrf-export B-out;
vrf-import B-in;


routing-options {
auto-export;


static {
route 1.1.2.1/32 next-hop fe-1/0/2.0;
route 1.1.2.2/32 next-hop fe-1/0/2.0;
}


}


}


}


}

Configuring Router PE2

The configuration for Router PE2 is the same as that for Router PE1; however, the interface names might differ.

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