Configuring An Ospf Nssa Area - HP MSR Series Configuration Manual

[RouterC] display ospf routing
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
After the area where Router C resides is configured as a stub area, a default route replaces the AS
external route.
# Configure the area as a totally stub area by filtering Type-3 LSAs out of the Stub area.
[RouterA] ospf
[RouterA-ospf-1] area 1
[RouterA-ospf-1-area-0.0.0.1] stub no-summary
[RouterA-ospf-1-area-0.0.0.1] quit
# Display OSPF routing information on Router C.
[RouterC] 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.

Configuring an OSPF NSSA area

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.
OSPF Process 1 with Router ID 10.4.1.1
Routing Tables
Cost
4
3
7
3
17
5
Inter Area: 4
OSPF Process 1 with Router ID 10.4.1.1
Routing Tables
Cost
4 Inter
3 Transit 10.2.1.2
3 Stub
Inter Area: 1
Type NextHop
Inter 10.2.1.1
Transit 10.2.1.2
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
10.2.1.1
10.4.1.1
ASE: 0 NSSA: 0
94
AdvRouter
10.2.1.1
10.2.1.1
10.2.1.1
10.4.1.1
10.2.1.1
10.2.1.1
AdvRouter
10.2.1.1 0.0.0.1
10.4.1.1 0.0.0.1
10.4.1.1 0.0.0.1
Area
0.0.0.1
0.0.0.1
0.0.0.1
0.0.0.1
0.0.0.1
0.0.0.1
Area