Configuring a PE Router to Provide BGP VPN Services

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 Example: 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

Related Documentation

• Creating Multicast VPNs in JunosE Multicast Routing Configuration Guide
• router bgp
• neighbor
• redistribute