HP 5500 EI series - OSPF NSSA Area Configuration Example

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[RouterA-ospf-1-area-0.0.0.1] quit
# Display OSPF routing information on Router C.
[RouterC] 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
After this configuration, inter-area routes are removed, and only one external route (a default route)
exists.
OSPF NSSA area configuration example
Network requirements
• Configure OSPF on all routers and split AS into three areas.
• Configure Router A and Router B as ABRs to forward routing information between areas.
• Configure Area 1 as an NSSA area and configure Router C as an ASBR to redistribute static routes
into the AS.
Figure 26 Network diagram
Configuration procedure
1. Configure IP addresses for interfaces. (Details not shown.)
2. Enable OSPF (see "Basic OSPF configuration example")
.
3. Configure Area 1 as an NSSA area:
# Configure Router A.
<RouterA> system-view
[RouterA] ospf
[RouterA-ospf-1] area 1
Area 0
Area 1
NSSA
Area 2
Router C
Eth1/1
10.1.1.2/24
Eth1/1
10.1.1.1/24
Eth1/2
10.4.1.1/24
Eth1/1
10.2.1.2/24
Router B
Eth1/2
10.3.1.1/24
Eth1/1
10.3.1.2/24
Router A
Eth1/2
10.2.1.1/24
Eth1/2
10.5.1.1/24
Router D
ASBR