[SwitchC-bgp] import-route ospf
4)
Configure route redistribution on Switch B.
# Configure OSPF to redistribute routes from BGP on Switch B.
[SwitchB] ospf
[SwitchB-ospf-1] import-route bgp
# Display the OSPF routing table of Switch A.
[SwitchA] display ip routing-table
Routing Tables: Public
Destinations : 8
Destination/Mask
10.1.1.0/24
10.2.1.0/24
10.3.1.0/24
10.4.1.0/24
11.2.1.0/24
11.2.1.2/32
127.0.0.0/8
127.0.0.1/32
5)
# Configure summary route 10.0.0.0/8 on Switch B and advertise it.
[SwitchB-ospf-1] asbr-summary 10.0.0.0 8
# Display the OSPF routing table of Switch A.
[SwitchA] display ip routing-table
Routing Tables: Public
Destinations : 5
Destination/Mask
10.0.0.0/8
11.2.1.0/24
11.2.1.2/32
127.0.0.0/8
127.0.0.1/32
Configuring an OSPF Stub 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. Switch D acts as the ASBR to
redistribute routes (static routes).
It is required to configure Area 1 as a Stub area, reducing LSAs to this area without affecting route
reachability.
Routes : 8
Proto
Pre
Cost
O_ASE
150
1
O_ASE
150
1
O_ASE
150
1
O_ASE
150
1
Direct 0
0
Direct 0
0
Direct 0
0
Direct 0
0
Routes : 5
Proto
Pre
Cost
O_ASE
150
2
Direct 0
0
Direct 0
0
Direct 0
0
Direct 0
0
1-56
NextHop
Interface
11.2.1.1
Vlan100
11.2.1.1
Vlan100
11.2.1.1
Vlan100
11.2.1.1
Vlan100
11.2.1.2
Vlan100
127.0.0.1
InLoop0
127.0.0.1
InLoop0
127.0.0.1
InLoop0
NextHop
Interface
11.2.1.1
Vlan100
11.2.1.2
Vlan100
127.0.0.1
InLoop0
127.0.0.1
InLoop0
127.0.0.1
InLoop0