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

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## Configure SEFOS2

1. Configure the generation of a default external network.
   1. Type.

          SEFOS# configure terminal
          SEFOS(config)# router ospf

   2. Configure the OSPF router ID.

          SEFOS(config-router)# router-id 10.4.0.2

   3. Enable OSPF over the VLAN interface and associate the interface with an OSPF area.

          SEFOS(config-router)# network 10.4.0.2 area 0.0.0.0
          SEFOS(config-router)# network 10.2.2.2 area 0.0.0.2

   4. Configure area `0.0.0.2` as an NSSA area.

          SEFOS(config)# area 0.0.0.2 nssa

   5. Exit Router Configuration mode.

          SEFOS(config-router)# end
          SEFOS#

2. Examine the results.

   Type 5 External LSA must be generated for the default route.

       SEFOS# show ip ospf database external

       OSPF Router with ID (10.10.2.1)
                         AS External Link States
                         -----------------------
       LS age             : 0
       Options            : (No ToS Capability, DC)
       LS Type            : AS External Link
       Link State ID      : 0.0.0.0
       Advertising Router : 10.10.2.1
       LS Seq Number      : 0x80000001
       Checksum           : 0xb5dd
       Length             : 36
       Network Mask       : 0.0.0.0
       Metric Type        : 0x80
       Metric             : 40
       Forward Address    : 0.0.0.0
       Externel Route Tag : 0

3. Examine the configuration details in SEFOS2.

   The route entry for the default route must exist.

       SEFOS# show ip ospf route

       OSPF Process Routing Table
       Dest/Mask                     TOS NextHop/Interface Cost Rt.Type   Area
       ---------                     --- -------/--------- ---- -------   ----
       0.0.0.0/0.0.0.0            0   10.4.0.1/vlan1    40   Type2Ext  0.0.0.0
       10.2.2.0/255.255.255.0     0   0.0.0.0/vlan2     1    IntraArea 0.0.0.2
       10.4.0.0/255.255.0.0       0   0.0.0.0/vlan1     1    IntraArea 0.0.0.0
       10.10.0.0/255.255.0.0      0   10.4.0.1/vlan1    2    InterArea 0.0.0.0

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