PE Router Configuration Tasks

To configure a PE router to provide BGP VPN services:

1. Configure PE-to-PE LSPs.

   See Configuring MPLS, for information about configuring LSPs.

2. Enable BGP routing.

   host1:vr1(config)#router bgp 100

3. (Optional) Disable automatic route-target filtering.

   host1:vr1(config-router)#no bgp default route-target filter

4. Configure PE-to-PE BGP sessions.
   1. Create the PE-to-PE session.

      host1:vr1(config)#router bgp 100

      host1:vr1(config-router)#neighbor 192.168.1.158 remote-as 100

   2. Create the VPN-IPv4 address family.

      host1:vr1(config-router)#address-family vpnv4

   3. Activate the PE-to-PE session in the VPN-IPv4 address family.

      host1:vr1(config-router-af)#neighbor 192.168.1.158 activate

      host1:vr1(config-router-af)#exit-address-family

   4. (Optional) Enable the BGP speaker to check the reachability of indirect next hops when selecting the best VPN-IPv4 route to a prefix.

      host1:pe1(config-router-af)#check-vpn-next-hops

5. Configure PE-to-CE BGP sessions.
   1. Enable and configure BGP:

      host1:vr1(config)#router bgp 100

      See Configuring BGP Routing , for more information about configuring BGP.

   2. Specify the IPv4 unicast address family for each VRF:

      host1:vr1(config-router)#address-family ipv4 unicast vrf vrfA

   3. Configure the method of route advertisement by doing one of the following:
      • Use neighbor commands to specify peers to which BGP advertises the routes:

        host1:vr1(config-router)#neighbor 10.12.13.0 remote-as 200

      • Use network commands or the redistribute static command to make BGP advertise static routes to customers.

        host1:vr1(config-router)#network 10.3.0.0 mask 255.255.0.0

        host1:vr1(config-router)#redistribute static

      • Use redistribute commands to make BGP advertise IGP routes to customers.

        host1:vr1(config-router)#redistribute ospf

6. (Optional) Configure an AS override.

   See Using a Single AS Number for All CE Sites for examples.

7. (Optional) Force the BGP speaker to accept routes that have the speaker’s AS number in its AS path.

   host1:vr1(config-router)#bgp enforce-first-as

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