Example: Configuring VPLS LDP Signaling
The example in
this section shows how to configure the VPLS topology illustrated
in Figure 1. 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 1: Topology for VPLS Configuration Example
with LDP Signaling
Topology Overview of VPLS with LDP Signaling
Because the basic components of a VPLS network
are the same regardless of whether BGP signaling or LDP signaling
is used, the sample topology shown for LDP signaling in Figure 1 is almost identical to the sample topology
shown for BGP signaling in Topology for VPLS Configuration Example with BGP Signaling. Figure 1 includes two VPLS domains: VPLS A, which connects CE 1
and CE 3, and VPLS B, which connects CE 2 and CE 4.
The local PE router, PE 1, and the remote PE router, PE 2, each participate
in both the VPLS A domain and the VPLS B domain, and have
one VPLS instance associated with each domain configured on each router.
Unlike a VPLS configuration with BGP signaling,
a VPLS configuration with LDP signaling requires that you configure
a VPLS ID for each VPLS instance to uniquely identify each VPLS domain.
In the sample topology in Figure 1, instance
vplsA is assigned VPLS ID 1, and instance vplsB is assigned VPLS ID
2 on both the local PE router and the remote PE router. You must also
configure a list of remote neighbor (peer) addresses to which LDP
can send or from which LDP can receive targeted hello messages. In
the sample topology, the remote neighbor configured for PE 1
is PE 2 with IP address 2.2.2.2, and the remote neighbor configured
for PE 2 is PE 1 with IP address 1.1.1.1.
The Ethernet and bridged Ethernet network interfaces,
ATM core-facing interfaces, VPLS virtual core interfaces, and MPLS
LSPs play the same role in a VPLS topology with LDP signaling as they
do in a VPLS topology with BGP signaling. For more information about
these components, see Topology Overview of VPLS with BGP Signaling.
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 1.
! Configure VPLS instance vplsA.host1(config)#bridge vplsA vpls transport-virtual-router
default !! Configure VPLS instance vplsB.host1(config)#bridge vplsB vpls transport-virtual-router
default !! Configure Fast Ethernet interface 2/1 between PE 1 and
CE 1, ! and assign it to vplsA as a trunk interface.host1(config)#interface fastEthernet 2/1 host1(config-if)#bridge-group vplsA subscriber-trunk host1(config-if)#exit !! Configure bridged Ethernet interface 6/0.12 between PE
1 and CE 2, ! and assign it to vplsB as a trunk interface.host1(config)#interface atm 6/0.12 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 LDP signaling for vplsA.host1(config)#mpls ldp vpls vplsA vpls-id
1 host1(config)#mpls ldp vpls vplsA neighbor
2.2.2.2 ! Configure LDP signaling for vplsB.host1(config)#mpls ldp vpls vplsB vpls-id
2 host1(config)#mpls ldp vpls vplsB neighbor
2.2.2.2 !! Configure a loopback interface on PE 1 and assign it
an IP address.host1(config)#interface loopback 0 host1(config-if)#ip address 1.1.1.1 255.255.255.255 host1(config-if)#exit !! Assign the router ID for PE 1 using the IP address of
the loopback interface.host1(config)#ip router-id 1.1.1.1 !! Configure ATM core-facing interface 6/0.10 between PE
1 and the P router,! and assign it an IP address.host1(config)#interface atm 6/0.10 point-to-point host1(config-subif)#atm pvc 10 0 10 aal5snap
0 0 0 host1(config-subif)#ip address 10.10.10.1
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 OSPF routing in the core MPLS network.host1(config)#router ospf 1 host1(config-router)#network 1.1.1.1 0.0.0.0
area 0.0.0.0 host1(config-router)#network 10.10.10.0 0.0.0.255
area 0.0.0.0 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 1.
! Configure VPLS instance vplsA.host2(config)#bridge vplsA vpls transport-virtual-router
default !! Configure VPLS instance vplsB.host2(config)#bridge vplsB vpls transport-virtual-router
default !! Configure Fast Ethernet interface 2/5 between PE 2 and
CE 3, ! and assign it to vplsA as a trunk interface.host2(config)#interface fastEthernet 2/5 host2(config-if)#bridge-group vplsA subscriber-trunk host2(config-if)#exit !! Configure bridged Ethernet interface 6/0.21 between PE
2 and CE 4, ! and assign it to vplsB as a trunk interface.host2(config)#interface atm 6/0.21 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 LDP signaling for vplsA.host2(config)#mpls ldp vpls vplsA vpls-id
1 host2(config)#mpls ldp vpls vplsA neighbor
1.1.1.1 !! Configure LDP signaling for vplsB.host2(config)#mpls ldp vpls vplsB vpls-id
2 host2(config)#mpls ldp vpls vplsB neighbor
1.1.1.1 !! Configure a loopback interface on PE 2 and assign it
an IP address.host2(config)#interface loopback 0 host2(config-if)#ip address 2.2.2.2 255.255.255.255 host2(config-if)#exit !! Assign the router ID for PE 2 using the IP address of
the loopback interface.host2(config)#ip router-id 2.2.2.2 !! Configure ATM core-facing interface 6/1.20 between PE
2 and the P router,! and assign it an IP address.host2(config)#interface atm 6/1.20 point-to-point host2(config-subif)#atm pvc 20 0 20 aal5snap
0 0 0 host2(config-subif)#ip address 20.20.20.2
255.255.255.0 !! Enable MPLS, LDP, and topology-driven LSPs on the core-facing
interface.host2(config-subif)#mpls host2(config-subif)#mpls ldp host2(config-subif)#exit !! Configure OSPF routing in the core MPLS network.host2(config)#router ospf 1 host2(config-router)#network 2.2.2.2 0.0.0.0
area 0.0.0.0 host2(config-router)#network 20.20.20.0 0.0.0.255
area 0.0.0.0 host2(config-router)#exit
Published: 2012-07-02
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