Configuring an ospf stub area, Network requirements – H3C Technologies H3C S12500 Series Switches User Manual
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# Configure Switch C.
[SwitchC] ospf
[SwitchC-ospf-1] import-route bgp
# Display the OSPF routing table on Switch A.
[SwitchA] display ip routing-table
Routing Tables: Public
Destinations : 8 Routes : 8
Destination/Mask Proto Pre Cost NextHop Interface
10.1.1.0/24 O_ASE 150 1 11.2.1.1 Vlan100
10.2.1.0/24 O_ASE 150 1 11.2.1.1 Vlan100
10.3.1.0/24 O_ASE 150 1 11.2.1.1 Vlan100
10.4.1.0/24 O_ASE 150 1 11.2.1.1 Vlan100
11.2.1.0/24 Direct 0 0 11.2.1.2 Vlan100
11.2.1.2/32 Direct 0 0 127.0.0.1 InLoop0
127.0.0.0/8 Direct 0 0 127.0.0.1 InLoop0
127.0.0.1/32 Direct 0 0 127.0.0.1 InLoop0
5.
Configure route summarization:
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 on Switch A.
[SwitchA] display ip routing-table
Routing Tables: Public
Destinations : 5 Routes : 5
Destination/Mask Proto Pre Cost NextHop Interface
10.0.0.0/8 O_ASE 150 2 11.2.1.1 Vlan100
11.2.1.0/24 Direct 0 0 11.2.1.2 Vlan100
11.2.1.2/32 Direct 0 0 127.0.0.1 InLoop0
127.0.0.0/8 Direct 0 0 127.0.0.1 InLoop0
127.0.0.1/32 Direct 0 0 127.0.0.1 InLoop0
The output shows that only summary route 10.0.0.0/8 exists.
Configuring an OSPF stub area
Network requirements
shows an AS 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).
Configure Area 1 as a Stub area, reducing LSAs to this area without affecting route reachability.