IP routing configuration examples 145

Configuring Area Border Routers (ABR)

Configuration of an OSPF ABR is an automatic process on the Nortel Ethernet Routing Switch 5500 Series; no user intervention is required. The Nortel Ethernet Routing Switch 5500 Series automatically becomes an OSPF ABR when it has operational OSPF interfaces belonging to more than one area.

In the configuration example below, the Nortel Ethernet Routing Switch 5500 Series R1 is automatically configured as an OSPF ABR after it is configured with an OSPF interface for area 0.0.0.0 and 0.0.0.2.

ABR configuration example

To recreate the illustrated ABR configuration, use the following procedure:

Step Action

1Configure an OSPF interface on port 2/6. Configure port 2/6 as a brouter port in VLAN 100.

5530-24TFD(config)# interface fast 2/6

5530-24TFD(config-if)# brouter port 2/6 vlan 100 subnet 10.1.1.17/30

2Configure an OSPF interface on port 2/1.

Configure port 2/1 as a brouter port in VLAN 200 and enable OSPF on this interface.

5530-24TFD(config)# interface fast 2/1

5530-24TFD(config-if)# brouter port 2/1 vlan 200 subnet 10.1.1.22/30

5530-24TFD(config-if)# ip ospf enable

Nortel Ethernet Routing Switch 5500 Series

Configuration-IP Routing Protocols

NN47200-503 03.01 Standard

5.127 August 2007

Copyright © 2005-2007, Nortel Networks

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Nortel Networks NN47200-503 manual Configuring Area Border Routers ABR, ABR configuration example