Nortel Networks NN47200-503 manual Configuring Autonomous System Border Routers Asbr

IP routing configuration examples 147

Area ID	Range Subnet/Mask	Range Type	Advertise Mode Metric
-----------	------------------	-------------	-------------- ------
0.0.0.2	172.3.0.0/16	Summary Link	Summarize	100

To display ABR status, use the show ip ospf command. Usage of this command on the example configuration would yield the following output:

Router ID: 1.1.1.2

Admin Status: Enabled

Version Number: 2

Area Border Router Oper Status: True

AS Boundary Router Config Status: False

External Link-State Advertisements: 2

External Link-State Checksum: 45698(0xb282)

Type-of-Service (TOS) Routing Supported: False

Originated Link-State Advertisements: 5

New Link-State Advertisements Received: 34

OSPF Traps: Disabled

Auto Virtual Link Creation: Disabled

SPF Hold-Down Time: 10

RFC 1583 Compatibility: Enabled

Configuring Autonomous System Border Routers (ASBR)

An ASBR is a router that has a connection to another Autonomous System to distribute any external routes that originated from a protocol into OSPF. A Nortel Ethernet Routing Switch 5500 Series configured as an ASBR can:

•Distribute all OSPF routes to RIP.

•Distribute RIP, direct, or static routes to OSPF.

Distributing OSPF routes to RIP and RIP to OSPF using AS-external LSA Type 1 metrics The configuration example illustrated below, displays a Nortel Ethernet Routing Switch 5500 Series configured as an ASBR between an OSPF and RIP version 2 network. In this example, the router distributes all OSPF routes to the RIP network and all RIP routes to the OSPF network.

Nortel Ethernet Routing Switch 5500 Series

Configuration-IP Routing Protocols

NN47200-503 03.01 Standard

5.127 August 2007

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