H3C Technologies H3C S12500 Series Switches - Manual (Page 138)

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OSPF Process 1 with Router ID 192.168.1.40
Routing Tables
Routing for Network
Destination Cost Type NextHop AdvRouter Area
44.44.44.44/32 2 Stub 12.12.12.2 44.44.44.44 0.0.0.0
14.14.14.0/24 2 Transit 12.12.12.2 192.168.1.41 0.0.0.0
22.22.22.22/32 0 Stub 22.22.22.22 192.168.1.40 0.0.0.0
12.12.12.0/24 1 Transit 12.12.12.1 192.168.1.40 0.0.0.0
Total Nets: 4
Intra Area: 4 Inter Area: 0 ASE: 0 NSSA: 0
# Display OSPF neighbors and routes on Switch B.
display ospf peer
OSPF Process 1 with Router ID 44.44.44.44
Neighbor Brief Information
Area: 0.0.0.0
Router ID Address Pri Dead-Time Interface State
192.168.1.41 14.14.14.2 1 33 Vlan200 Full/DR
display ospf routing
OSPF Process 1 with Router ID 44.44.44.44
Routing Tables
Routing for Network
Destination Cost Type NextHop AdvRouter Area
44.44.44.44/32 0 Stub 44.44.44.44 44.44.44.44 0.0.0.0
14.14.14.0/24 1 Transit 14.14.14.1 192.168.1.41 0.0.0.0
22.22.22.22/32 2 Stub 14.14.14.2 192.168.1.40 0.0.0.0
12.12.12.0/24 2 Transit 14.14.14.2 192.168.1.40 0.0.0.0
Total Nets: 4
Intra Area: 4 Inter Area: 0 ASE: 0 NSSA: 0
The output shows that when an active/standby switchover occurs on Switch S, the neighbor
relationships and routing information on Switch A and Switch B have not changed and the traffic
from Switch A to Switch B has not been impacted.
Configuring route filtering
Network requirements
In Figure 49 , 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.