127
Intra area: 4 Inter area: 0 ASE: 0 NSSA: 0
# Display OSPF neighbors on Switch B to verify the neighbor relationship between Switch B and
Switch S.
<SwitchB> display ospf peer
OSPF Process 1 with Router ID 4.4.4.1
Neighbor Brief Information
Area: 0.0.0.0
Router ID Address Pri Dead-Time State Interface
3.3.3.1 14.14.14.2 1 39 Full/BDR Vlan200
# Display OSPF routes on Switch B to verify if Switch B has a route to the loopback interface on
Switch A.
<SwitchB> display ospf routing
OSPF Process 1 with Router ID 4.4.4.1
Routing Table
Topology base (MTID 0)
Routing for network
Destination Cost Type NextHop AdvRouter Area
44.44.44.44/32 0 Stub 44.44.44.44 4.4.4.1 0.0.0.0
14.14.14.0/24 1 Transit 14.14.14.1 4.4.4.1 0.0.0.0
22.22.22.22/32 2 Stub 14.14.14.2 2.2.2.1 0.0.0.0
12.12.12.0/24 2 Transit 14.14.14.2 2.2.2.1 0.0.0.0
Total nets: 4
Intra area: 4 Inter area: 0 ASE: 0 NSSA: 0
The output shows the following when an active/standby switchover occurs on Switch S:
The neighbor relationships and routing information on Switch A and Switch B have not
changed.
The traffic from Switch A to Switch B has not been impacted.
BFD for OSPF configuration example
Network requirements
As shown in Figure 33, run OSPF on Switch A, Switch B, and Switch C so that they are reachable to
each other at the network layer.
When the link over which Switch A and Switch B communicate through a Layer 2 switch fails,
BFD can quickly detect the failure and notify OSPF of the failure.
Switch A and Switch B then communicate through Switch C.
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