3Com Switch 8800 Advanced Software V5 Configuration Guide

OSPF Configuration Examples 343
# Display the OSPF routing table on SwitchC.
[SwitchC] display ospf routing
OSPF Process 1 with Router ID 192.168.1.2
Routing Tables
Routing for Network
Destination Cost type NextHop AdvRouter Area
0.0.0.0/0 65536 Inter 192.168.1.1 192.168.1.1 0.0.0.1
172.16.1.0/24 1 Stub 172.16.1.1 192.168.1.2 0.0.0.1
192.168.1.0/24 65535 Transit 192.168.1.2 192.168.1.2 0.0.0.1
Total Nets: 3
Intra Area: 2 Inter Area: 1 ASE: 0 NSSA: 0
n
After this configuration, routing table 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. SwitchA and SwitchB act as ABRs to forward routing information between
areas. SwitchD acts as the ASBR, redistributing routes (static routes)
It is required to configure Area1 as an NSSA area, RouterC as the ASBR to
redistribute static routes into the AS.
Network diagram
Figure 105 Network diagram for OSPF NSSA area configuration
Configuration procedure
1 Configure IP addresses for interfaces.
2 Configure OSPF basic functions (refer to “Configuring OSPF Basic Functions” on
page 323 ).
3 Configure SwitchD to import external static routes (refer to “Authentication” on
page 319 previous example)
4 Configure Area1 as an NSSA area.
# Configure SwitchA.
Area 0
Area 1
NSSA
Area 2
Switch C
Vlan-int100
192.168 .0.2/24
Vlan-int100
192.168 .0.1/24
Vlan-int300
172.16.1 .1/24
Vlan-int200
192.168.1.2/24
Switch B
Vlan-int200
192.168.2.1/24
Vlan-int200
192.168.2 .2/24
Switch A
Vlan-int200
192.168.1.1/24
Vlan-int300
172.17.1.1/24
Switch D
ASBR
ASBR