Nortel Networks NN47200-503 manual Controlling Nssa external route advertisements

150IP Routing Configuration and Management

2Configure a route policy.

Create a route policy named Policy_Default which distributes the IP prefix list created in step 1. Note that ospf is selected as the match-protocolvalue. This causes the default route to be advertised through RIP only if OSPF is operational.

5530-24TFD(config)# route-map Policy_Default permit 1 enable match protocol ospf set injectlist default 5530-24TFD(config)# route-map Policy_Default

1 set metric-type type1

3Apply the route policy to the RIP Out Policy.

Apply the route policy created in step 2 to RIP interface 10.1.1.41.

5530-24TFD(config)# interface vlan 100

5530-24TFD(config-if)# ip rip out-policy Policy_Default

—End—

Controlling NSSA external route advertisements

In an OSPF NSSA, the NSSA N/p-bit (in the OSPF hello packets Options field) is used to tell the ABR which external routes can be advertised to other areas. When the NSSA N/p-bit is set true, the ABR exports the external route. This is the default setting for the Nortel Ethernet Routing Switch 5500 Series. When the NSSA N/p-bit is not set true, the ABR drops the external route. A route policy can be created on the Nortel Ethernet Routing Switch 5500 Series to manipulate the N/ p-bit value.

For example, the illustration below shows a RIP network located in NSSA

2.If advertising the 15.15.15.0/24 network to area 0 is the only desired action, perform the following tasks:

•Enable R1 as an OSPF ASBR.

•Create NSSA area 0.0.0.2.

•Create a route policy to advertise OSPF and direct interfaces to RIP.

•Create a route policy to only advertise RIP network 15.15.15.0/24 to area 0 by using the NSSA N/p-bit.

Nortel Ethernet Routing Switch 5500 Series

Configuration-IP Routing Protocols

NN47200-503 03.01 Standard

5.127 August 2007

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