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# VPLS Configuration Example with BGP Signaling

The example in this section shows how to configure the VPLS topology illustrated in Figure 128. The example includes the commands for configuring VPLS on both the local E-series router (PE 1) and the remote E-series router (PE 2).

Figure 128: Topology for VPLS Configuration Example with BGP Signaling

## Topology Overview of VPLS with BGP Signaling

The sample topology in Figure 128 includes two VPLS domains, VPLS A and VPLS B. VPLS A connects CE 1, at the edge of Customer A’s Boston site, with CE 3, at the edge of Customer A’s Chicago site. Similarly, VPLS B connects CE 2, at the edge Customer B’s Boston site, with CE 4, at the edge of Customer B’s Chicago site.

The E-series routers in the topology, PE 1 and PE 2, each participate in both the VPLS A domain and the VPLS B domain. The example configures a total of four separate VPLS instances, one for each VPLS domain in which the PE router participates. The instances for the VPLS A domain are named vplsA, and the instances for the VPLS B domain are named vplsB.

For each VPLS instance, an Ethernet or bridged Ethernet network interface provides a connection to the associated CE device. Each VPLS instance maintains its own set of forwarding tables and filters to learn the network topology, in a manner that is similar to a bridge group used for transparent bridging.

Each PE router in the sample topology also has an ATM core-facing interface that connects it to the provider (P) router in the service provider core. You must configure MPLS LSPs on the core-facing interfaces to connect PE 1 and PE 2 through the P router across the service provider core. Finally, you must configure BGP on both PE 1 and PE 2 to provide signaling for both VPLS domains.

After you configure the bridging, MPLS, and BGP components of VPLS, 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.

## Configuration on PE 1 (Local PE Router)

Use the following commands on the local PE router (PE 1) to configure the VPLS topology shown in Figure 128.

`

! Configure VPLS instance vplsA.
host1(config)#bridge vplsA vpls transport-virtual-router default
host1(config)#bridge vplsA vpls site-range 10
host1(config)#bridge vplsA vpls site-name boston site-id 1
host1(config)#bridge vplsA vpls rd 100:11
host1(config)#bridge vplsA vpls route-target both 100:1
!
! Configure VPLS instance vplsB.
host1(config)#bridge vplsB vpls transport-virtual-router default
host1(config)#bridge vplsB vpls site-range 20
host1(config)#bridge vplsB vpls site-name boston site-id 1
host1(config)#bridge vplsB vpls rd 100:12
host1(config)#bridge vplsB vpls route-target both 100:2
!
! Configure Fast Ethernet interface 3/0 between PE 1 and CE 1,
! and assign it to vplsA as a trunk interface.
host1(config)#interface fastEthernet 3/1
host1(config-if)#bridge-group vplsA subscriber-trunk
host1(config-if)#exit
!
! Configure bridged Ethernet interface 2/0.12 between PE 1 and CE 2,
! and assign it to vplsB as a trunk interface.
host1(config)#interface atm 2/0.12 point-to-point
host1(config-subif)#atm pvc 12 0 12 aal5snap 0 0 0
host1(config-subif)#encapsulation bridge1483 mac-address 0090.1a40.9991
host1(config-subif)#bridge-group vplsB subscriber-trunk
host1(config-if)#exit
!
! Configure a loopback interface on PE 1 and assign it an IP address.
host1(config)#interface loopback 0
host1(config-if)#ip address 10.1.1.1 255.255.255.255
host1(config-if)#exit
!
! Assign the router ID for PE 1 using the IP address of the loopback interface.
host1(config)#ip router-id 10.1.1.1
!
! Enable MPLS on the default virtual router.
host1(config)#mpls
!
! Configure ATM core-facing interface 2/0.100 between PE 1 and the P router,
! and assign it an IP address.
host1(config)#interface atm 2/0.100 point-to-point
host1(config-subif)#atm pvc 100 1 100 aal5snap 0 0 0
host1(config-subif)#ip address 192.168.1.1 255.255.255.0
!
! Enable MPLS, LDP, and topology-driven LSPs on the core-facing interface.
host1(config-subif)#mpls
host1(config-subif)#mpls ldp
host1(config-subif)#exit
!
! Configure BGP signaling.
host1(config)#router bgp 100
host1(config-router)#neighbor 10.2.2.2 remote-as 100
host1(config-router)#neighbor 10.2.2.2 update-source loopback 0
host1(config-router)#neighbor 10.2.2.2 next-hop-self
host1(config-router)#address-family l2vpn signaling
host1(config-router-af)#neighbor 10.2.2.2 activate
host1(config-router-af)#neighbor 10.2.2.2 next-hop-self
host1(config-router-af)#exit-address-family
host1(config-router)#address-family vpls vplsA
host1(config-router-af)#exit-address-family
host1(config-router)#address-family vpls vplsB
host1(config-router-af)#exit-address-family
host1(config-router)#exit

`

## Configuration on PE 2 (Remote PE Router)

Use the following commands on the remote PE router (PE 2) to configure the VPLS topology shown in Figure 128.

`

! Configure VPLS instance vplsA. The route target (100:1)
! matches the route target configured for vplsA on PE 1.
host2(config)#bridge vplsA vpls transport-virtual-router default
host2(config)#bridge vplsA vpls site-range 10
host2(config)#bridge vplsA vpls site-name chicago site-id 2
host2(config)#bridge vplsA vpls rd 100:21
host2(config)#bridge vplsA vpls route-target both 100:1
!
! Configure VPLS instance vplsB. The route target (100:2)
! matches the route target configured for vplsB on PE 1.
host2(config)#bridge vplsB vpls transport-virtual-router default
host2(config)#bridge vplsB vpls site-range 20
host2(config)#bridge vplsB vpls site-name chicago site-id 2
host2(config)#bridge vplsB vpls rd 100:22
host2 (config)#bridge vplsB vpls route-target both 100:2
! Configure Fast Ethernet interface 3/5 between PE 2 and CE 3,
! and assign it to vplsA as a trunk interface.
host2(config)#interface fastEthernet 3/5
host2(config-if)#bridge-group vplsA subscriber-trunk
host2(config-if)#exit
!
! Configure bridged Ethernet interface 2/0.21 between PE 2 and CE 4,
! and assign it to vplsB as a trunk interface.
host2(config)#interface atm 2/0.21 point-to-point
host2(config-subif)#atm pvc 21 0 21 aal5snap 0 0 0
host2(config-subif)#encapsulation bridge1483 mac-address 0090.1a40.9992
host2(config-subif)#bridge-group vplsB subscriber-trunk
host2(config-if)#exit
!
! Configure a loopback interface on PE 2 and assign it an IP address.
host2(config)#interface loopback 0
host2(config-if)#ip address 10.2.2.2 255.255.255.255
host2(config-if)#exit
!
! Assign the router ID for PE 2 using the IP address of the loopback interface.
host2(config)#ip router-id 10.2.2.2
!
! Enable MPLS on the default virtual router.
host2(config)#mpls
!
! Configure ATM core-facing interface 3/1.100 between PE 2 and the P router,
! and assign it an IP address.
host2(config)#interface atm 3/1.100 point-to-point
host2(config-subif)#atm pvc 100 1 100 aal5snap 0 0 0
host2(config-subif)#ip address 192.168.2.2 255.255.255.0
!
! Enable MPLS, LDP, and topology-driven LSPs on the on the core-facing interface.
host2(config-subif)#mpls
host2(config-subif)#mpls ldp
host2(config-subif)#exit
!
! Configure BGP signaling.
host2(config)#router bgp 100
host2(config-router)#neighbor 10.1.1.1 remote-as 100
host2(config-router)#neighbor 10.1.1.1 update-source loopback 0
host2(config-router)#neighbor 10.1.1.1 next-hop-self
host2(config-router)#address-family l2vpn signaling
host2(config-router-af)#neighbor 10.1.1.1 activate
host2(config-router-af)#neighbor 10.1.1.1 next-hop-self
host2(config-router-af)#exit-address-family
host2(config-router)#address-family vpls vplsA
host2(config-router-af)#exit-address-family
host2(config-router)#address-family vpls vplsB
host2(config-router-af)#exit-address-family
host2(config-router)#exit

`

#### Related Topics

- Configuration Tasks for VPLS with BGP Signaling

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