Configuring The Loopback Interface And Router Id For Vpls - Juniper JUNOSE 11.2.X BGP AND MPLS Configuration Manual

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Configuring the Loopback Interface and Router ID for VPLS

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(Optional) Configure the interface as a trunk (server) interface. For more information
3.
about the differences between a subscriber (client) interface and a trunk (server)
interface, see "Subscriber Policies for VPLS Network Interfaces Overview" on page 577
.
host1(config-if)#bridge-group customer1 subscriber-trunk
(Optional) Set the maximum number of MAC addresses that the network interface
4.
can learn.
host1(config-if)#bridge-group customer1 learn 100
Enable SNMP link status processing only for the specified network interface in the
5.
VPLS instance.
host1(config-if)#bridge-group customer1 snmp-trap link-status
Configuring VPLS with BGP Signaling on a PE Router on page 590
Configuring VPLS with LDP Signaling on a PE Router on page 602
bridge-group
A loopback interface provides a stable address for BGP or LDP to use so that they can
avoid any impact if a physical interface goes down. The loopback interface sends packets
back to the router or access server for local processing. Any packets routed from the
loopback interface, but not destined to the loopback interface, are dropped.
To establish a BGP session, BGP uses the IP address of the outgoing interface towards
the BGP peer as the update source IP address for the TCP connection over which the
BGP session runs. Typically, you configure a loopback interface as the update source
interface.
LDP uses the loopback interface as the associated interface for the targeted neighbors
configured with the mpls ldp vpls neighbor command, as described in "Configuring LDP
Signaling for VPLS" on page 604.
After you configure the loopback interface, you use the ip router-id command to assign
a router ID to uniquely identify the router within a BGP AS. The router ID is the IP address
of the loopback interface.
To configure the loopback interface and router ID on the PE router:
Configure a loopback interface on the PE router and assign it an IP address.
1.
host1(config)#interface loopback 0
host1(config-if)#ip address 10.3.3.3 255.255.255.255
host1(config-if)#exit
Assign the router ID using the IP address you configured for the loopback interface.
2.
host1(config)#ip router-id 10.3.3.3
Chapter 12: Configuring VPLS
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