OSPF Configuration Examples 315
[SwitchC] display ospf routing
OSPF Process 1 with Router ID 10.4.1.1
Routing Tables
Routing for Network
Destination Cost Type NextHop AdvRouter Area
0.0.0.0/0 4 Inter 10.2.1.1 10.2.1.1 0.0.0.1
10.2.1.0/24 3 Transit 10.2.1.2 10.4.1.1 0.0.0.1
10.4.1.0/24 3 Stub 10.4.1.1 10.4.1.1 0.0.0.1
Total Nets: 3
Intra Area: 2 Inter Area: 1 ASE: 0 NSSA: 0
n
After this configuration, routing entries on the stub router are further reduced,
containing only one default external route.
Configuring an OSPF
NSSA Area
Network requirements
The following figure shows an AS is split into three areas, where all switches run
OSPF. Switch A and Switch B act as ABRs to forward routing information between
areas.
It is required to configure Area 1 as an NSSA area, and configure Router C as the
ASBR to redistribute static routes into the AS.
Network diagram
Figure 95 Network diagram for OSPF NSSA area configuration
Configuration procedure
1 Configure IP addresses for interfaces.
2 Configure OSPF basic functions (refer to “Configuring OSPF Basic Functions” on
page 310).
3 Configure Area 1 as an NSSA area.
# Configure Switch A.
[SwitchA] ospf
[SwitchA-ospf-1] area 1
[SwitchA-ospf-1-area-0.0.0.1] nssa default-route-advertise no-summary
[SwitchA-ospf-1-area-0.0.0.0] quit
[SwitchA-ospf-1] quit
Area 0
Area 1
NSSA
Area 2
Switch C
Vlan-int100
10 .1 .1. 2/ 24
Vlan-int100
10. 1.1.1 /24
Vlan-int300
10.4.1.1/24
Vlan-int200
10 .2 .1. 2/ 24
Switch B
Vlan-int200
10.3.1.1/24
Vlan-int200
10.3.1.2/24
Switch A
Vlan-int200
10. 2.1 .1/ 24
Vlan-int300
10.5.1.1/24
Switch D
ASBR
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