3Com S7906E - Switch, Руководство по настройке

Страница: 692 / 2621

1-59
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
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, routing entries on the stub router are further reduced, containing only one
default external route.
Configuring an OSPF NSSA Area
Network requirements
The following figure 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.
It is required to configure Area 1 as an NSSA area, and configure Router C as the ASBR to redistribute
static routes into the AS.