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# Configuring BGP Signaling for VPLS

This section describes one way to configure BGP signaling for VPLS, but does not provide complete details about configuring BGP and BGP/MPLS VPNs.

Table 80 lists the commands discussed in this section to configure BGP signaling for VPLS.

Table 80: Commands to Configure BGP Signaling for VPLS

address-family l2vpn | neighbor next-hop-self
address-family vpls | neighbor remote-as
exit-address-family | neighbor send-community
ip router-id | neighbor update-source
neighbor activate | router bgp

To configure BGP signaling for VPLS on the PE router:

1. Enable the BGP routing protocol on the PE router and specify the local AS; that is, the AS to which this BGP speaker belongs.
   `
   host1(config)#router bgp 100
   `

   The AS number identifies the PE router to other BGP routers.

2. Configure the PE-to-PE BGP session by first adding an entry to the BGP neighbor table.
   `
   host1(config-router)#neighbor 10.4.4.4 remote-as 100
   `
3. Use neighbor commands to specify the peers to which BGP advertises routes.

   This example configures only the update-source and next-hop-self attributes. The update-source attribute allows the BGP session to use the IP address of a specific operational interface as the update source address for TCP connections. the next-hop-self attribute forces the BGP speaker to report itself as the next hop for an advertised route that it learned from a neighbor.

   `
   host1(config-router)#neighbor 10.4.4.4 update-source loopback 0
   host1(config-router)#neighbor 10.4.4.4 next-hop-self
   `
4. Create the L2VPN address family to configure the router to exchange layer 2 NLRI for all VPLS instances.
   `
   host1(config-router)#address-family l2vpn signaling
   `
5. Activate the PE-to-PE session in the L2VPN address family by specifying neighbors that exchange routes from within the current address family.
   `
   host1(config-router-af)#neighbor 10.4.4.4 activate
   `
6. Use neighbor commands to configure additional address family parameters for the session, then exit the address family.

   This example configures only the next-hop-self attribute, forcing the BGP speaker to report itself as the next hop for an advertised route that it learned from a neighbor.

   `
   host1(config-router-af)#neighbor 10.4.4.4 next-hop-self
   host1(config-router-af)#exit-address-family
   `
7. Create the VPLS address family to configure the router to exchange layer 2 NLRI for each VPLS instance configured on the router.

   You must issue the address-family vpls command separately for each VPLS instance configured on the router.

   `
   host1(config-router)#address-family vpls customer1
   host1(config-router-af)#exit-address-family
   host1(config-router)#address-family vpls customer2
   `

After you configure MPLS LSPs and BGP signaling, the router automatically generates a VPLS virtual core interface for each VPLS instance. The VPLS virtual core interface represents all of the MPLS tunnels from the router to the remote VE device.

#### Related Topics

- Configuration Tasks for VPLS with BGP Signaling
- See Configuring BGP Routing for information about configuring BGP.
- See Configuring BGP-MPLS Applications for information about configuring BGP/MPLS VPNs.
- address-family l2vpn
- address-family vpls command
- exit-address-family
- neighbor activate
- neighbor next-hop-self
- neighbor remote-as
- router bgp

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