Ospf Nssa Area Configuration Example - HP FlexFabric 12900E Series Configuration Manual

Routing for network
Destination
0.0.0.0/0
10.2.1.0/24
10.3.1.0/24
10.4.1.0/24
10.5.1.0/24
10.1.1.0/24
Total nets: 6
Intra area: 2
The output shows that a default route replaces the AS external route.
# Configure Area 1 as a totally stub area.
[SwitchA] ospf
[SwitchA-ospf-1] area 1
[SwitchA-ospf-1-area-0.0.0.1] stub no-summary
[SwitchA-ospf-1-area-0.0.0.1] quit
[SwitchA-ospf-1] quit
# Display OSPF routing information on Switch C.
[SwitchC] display ospf routing
Routing for network
Destination
0.0.0.0/0
10.2.1.0/24
10.4.1.0/24
Total nets: 3
Intra area: 2
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
•
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.
Cost
4
3
7
3
17
5
Inter area: 4
OSPF Process 1 with Router ID 10.4.1.1
Routing Table
Cost
4
3
3
Inter area: 1
Figure 28:
Type NextHop
Inter 10.2.1.1
Transit 0.0.0.0
Inter 10.2.1.1
Stub 10.4.1.1
Inter 10.2.1.1
Inter 10.2.1.1
ASE: 0 NSSA: 0
Type NextHop
Inter 10.2.1.1
Transit 0.0.0.0
Stub 10.4.1.1
ASE: 0 NSSA: 0
113
AdvRouter Area
10.2.1.1 0.0.0.1
10.2.1.1 0.0.0.1
10.2.1.1 0.0.0.1
10.4.1.1 0.0.0.1
10.2.1.1 0.0.0.1
10.2.1.1 0.0.0.1
AdvRouter Area
10.2.1.1 0.0.0.1
10.4.1.1 0.0.0.1
10.4.1.1 0.0.0.1