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| Sun Ethernet Fabric Operating System ### OSPF Administration Guide

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## Configure the Summary Address

See NSSA Configuration, Summary Address Configuration, and Area Default-Cost for the topology for this procedure.

1. Enter Global Configuration mode in SEFOS1.

       SEFOS# configure terminal

2. Enable OSPF globally in the switch SEFOS1.

       SEFOS(config)# router ospf

3. Configure the OSPF router ID.

       SEFOS(config-router)# router-id 10.10.2.1

4. Configure the OSPF interface.

       SEFOS(config-router)# network 10.4.0.1 area 0.0.0.0
       SEFOS(config-router)# network 10.10.2.1 area 0.0.0.6

5. Configure the area `0.0.0.6` as an NSSA area.

       SEFOS(config-router)# area 0.0.0.6 nssa

6. Configure the summary address for `90.0.0.0/8` in the NSSA area.

       SEFOS(config-router)# summary-address 90.0.0.0  255.0.0.0  0.0.0.6

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