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Configuring IBGP on the PE Routers

On the PE routers, configure an IBGP session with the following properties:

VPN family—To indicate that the IBGP session is for the VPN, include the family inet-vpn statement.
Loopback address—Include the local-address statement, specifying the local PE router’s loopback address. The IBGP session for VPNs runs through the loopback address. You must also configure the lo0 interface at the [edit interfaces] hierarchy level. The example does not include this part of the router’s configuration.
Neighbor address—Include the neighbor statement, specifying the IP address of the neighboring PE router, which is its loopback (lo0) address.

On Router PE1, configure IBGP:



[edit]
protocols {


bgp {


group PE1-to-PE2 {
type internal;
local-address 10.255.1.1; 


family inet-vpn {
unicast;
}


neighbor 10.255.200.2;
}


}


}

On Router PE2, configure IBGP:



[edit]
protocols {


bgp {


group PE2-to-PE1 {
type internal;
local-address 10.255.200.2; 


family inet-vpn {
unicast;
}


neighbor 10.255.1.1;
}


}


}

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