Configuring An Ospf Nssa Area - HP MSR2000 series Configuration Manual

[SwitchC-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
10.3.1.0/24
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 when Switch C resides in the stub area, a default route takes the place of the
external route.
# Filter Type-3 LSAs out the 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
# 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
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
Figure 42 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.
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
3
3
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
Inter 10.2.1.1
Transit 10.2.1.2
Stub 10.4.1.1
ASE: 0 NSSA: 0
107
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