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Configuring Overlapping VPNs with BGP and Automatic Route Export

The following example provides the configuration for an overlapping VPN where BGP is used between the PE and CE routers.

Configure routing instance VPN-A:



[edit]
routing-instances {


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


routing-options {
auto-export;
}




protocols {


bgp {


group vpna-site1 {
peer-as 1;
neighbor 192.168.197.141;
}


}


}


}


}

Configure routing instance VPN-AB:



[edit]
routing-instances {


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


routing-options {
auto-export;
}




protocols {


bgp {


group vpnab-site1 {
peer-as 9;
neighbor 192.168.197.178;
}


}


}


}


}

For this configuration, the auto-export statement replaces the functionality that was provided by a routing table group configuration. However, sometimes additional configuration is required.

Since the vrf-import policy and the vrf-export policy from which the auto-export statement deduces the import and export matrix are configured on a per-instance basis, you must be able to enable or disable them for unicast and multicast, in case multicast network layer reachability information (NLRI) is configured.

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