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Configuring route filtering
Network requirements
As shown in Figure 46:
• All the switches in the network run OSPF. The AS is divided into three areas.
• Switch A and Switch B work as ABRs.
Configure Switch C as an ASBR to redistribute external routes (static routes), and configure a filter policy
on Switch C to filter out redistributed route 3.1.3.0/24.
Configure a routing policy on Switch A to filter route 10.5.1.0/24.
Figure 46 Network diagram
Configuration procedure
1. Configure IP addresses for interfaces. (Details not shown.)
2. Configure OSPF basic functions. (See "Configuring OSPF basic functions")
3. Configure OSPF to redistribute routes:
# On Switch C, configure a static route destined for network 3.1.1.0/24.
<SwitchC> system-view
[SwitchC] ip route-static 3.1.1.0 24 10.4.1.2
# On Switch C, configure a static route destined for network 3.1.2.0/24.
[SwitchC] ip route-static 3.1.2.0 24 10.4.1.2
# On Switch C, configure a static route destined for network 3.1.3.0/24.
[SwitchC] ip route-static 3.1.3.0 24 10.4.1.2
# On Switch C, configure OSPF to redistribute static routes.
[SwitchC] ospf 1
[SwitchC-ospf-1] import-route static
[SwitchC-ospf-1] quit
# Display the OSPF routing table on Switch A.
<SwitchA> display ip routing-table
Routing Tables: Public
Destinations : 12 Routes : 12
Destination/Mask Proto Pre Cost NextHop Interface
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