Brocade Multi-Service IronWare Routing Configuration Guide Bedienungsanleitung PDF herunterladen (Seite 199)

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Multi-Service IronWare Routing Configuration Guide 171

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Configuring OSPF

Figure 12 shows an example of an OSPF network containing an NSSA.

FIGURE 12 OSPF network containing an NSSA

This example shows two routing domains, a RIP domain and an OSPF domain. The ASBR inside the

NSSA imports external routes from RIP into the NSSA as Type-7 LSAs, which the ASBR floods

throughout the NSSA.

The ABR translates the Type-7 LSAs into Type-5 LSAs. If an area range is configured for the NSSA,

the ABR also summarizes the LSAs into an aggregate LSA before flooding the Type-5 LSAs into the

backbone.

Since the NSSA is partially “stubby” the ABR does not flood external LSAs from the backbone into

the NSSA. To provide access to the rest of the Autonomous System (AS), the ABR generates a

default Type-7 LSA into the NSSA.

Configuring an NSSA

To configure OSPF area 10.1.1.1 as an NSSA, enter the following commands.

Brocade(config)# router ospf

Brocade(config-ospf-router)# area 10.1.1.1 nssa 1

Brocade(config-ospf-router)# write memory

Syntax: [no] area area-id nssa [[nssa-ext-metric] [default-information-originate [metric

metric-value | metric-type type-value]] [no-redistribution] [translator-always]

[translator-interval stability-interval]]

The area-id parameter specifies the area and has the format xx or xx.xxxx. For example, 49 and

49.2211 are valid area IDs.

The nssa-ext-metric parameter specifies the NSSA's advertised external route metric.

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