R21xx-HP FlexFabric 11900 Layer 3 IP Routing Configuration Guide

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Configuring an OSPF stub area
Network requirements
• Enable OSPF on all switches, and split the AS into three areas.
• Configure Switch A and Switch B as ABRs to forward routing information between areas.
• Configure Switch D as the ASBR to redistribute static routes.
• Configure Area 1 as a stub area to reduce advertised LSAs without influencing reachability.
Figure 23 Network diagram
Configuration procedure
1. Configure IP addresses for interfaces. (Details not shown.)
2. Enable OSPF (see "Configuring basic OSPF").
3. Configure route redistribution:
# Configure Switch D to redistribute static routes.
<SwitchD> system-view
[SwitchD] ip route-static 3.1.2.1 24 10.5.1.2
[SwitchD] ospf
[SwitchD-ospf-1] import-route static
[SwitchD-ospf-1] quit
# Display ABR/ASBR information on Switch C.
<SwitchC> display ospf abr-asbr
OSPF Process 1 with Router ID 10.4.1.1
Routing Table to ABR and ASBR
Type Destination Area Cost Nexthop RtType
Intra 10.2.1.1 0.0.0.1 3 10.2.1.1 ABR
Inter 10.5.1.1 0.0.0.1 7 10.2.1.1 ASBR
# Display OSPF routing table on Switch C.
<SwitchC> display ospf routing
Area 0
Area 1
Stub
Area 2
Switch C
Vlan-int100
10.1.1.2/24
Vlan-int100
10.1.1.1/24
Vlan-int300
10.4.1.1/24
Vlan-int200
10.2.1.2/24
Switch B
Vlan-int200
10.3.1.1/24
Vlan-int200
10.3.1.2/24
Switch A
Vlan-int200
10.2.1.1/24
Vlan-int300
10.5.1.1/24
Switch D
ASBR