106
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
The output shows that inter-area routes are removed, and only one external route (a default
route) exists on Switch C.
OSPF NSSA area configuration example)
Network requirements
As shown in Figure 26:
• Configure OSPF on all switches and split AS into three areas.
• Configure Switch A and Switch B as ABRs to forward routing information between areas.
• Configure Area 1 as an NSSA area and configure Switch C as an ASBR to redistribute static
routes into the AS.
Figure 26 Network diagram
Configuration procedure
1. Configure IP addresses for interfaces.
2. Enable OSPF (see "Basic OSPF configuration example").
3. Configure Area 1 as an NSSA area:
# Configure Switch A.
<SwitchA> system-view
[SwitchA] ospf
[SwitchA-ospf-1] area 1
[SwitchA-ospf-1-area-0.0.0.1] nssa
[SwitchA-ospf-1-area-0.0.0.1] quit
[SwitchA-ospf-1] quit
# Configure Switch C.
<SwitchC> system-view
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