Ospf Virtual Link Configuration Example - HP FlexFabric 12900E Series Configuration Manual

Router ID: 2.2.2.2
State: 2-Way
DR: 192.168.1.1
Options is 0x02 (-|-|-|-|-|-|E|-)
Dead timer due in 35
Neighbor is up for 00:01:44
Authentication Sequence: [ 0 ]
Neighbor state change count: 6
BFD status: Disabled
Router ID: 3.3.3.3
State: Full
DR: 192.168.1.1
Options is 0x02 (-|-|-|-|-|-|E|-)
Dead timer due in 39
Neighbor is up for 00:01:41
Authentication Sequence: [ 0 ]
Neighbor state change count: 6
BFD status: Disabled
The output shows that Switch A becomes the DR and Switch C becomes the BDR.
If the neighbor state is full, Switch D has established an adjacency with the neighbor. If the
neighbor state is 2-way, the two switches are not the DR or the BDR, and they do not exchange
LSAs.
# Display OSPF interface information.
[SwitchA] display ospf interface
Area: 0.0.0.0
IP Address
192.168.1.1
[SwitchB] display ospf interface
Area: 0.0.0.0
IP Address
192.168.1.2
The interface state DROther means the interface is not the DR or BDR.

OSPF virtual link configuration example

Network requirements
As shown in
the backbone area. After configuration, Switch B can learn routes to Area 2.
Mode: None
BDR: 192.168.1.3
sec
Mode: Nbr is slave
BDR: 192.168.1.3
sec
OSPF Process 1 with Router ID 1.1.1.1
Interfaces
Type
Broadcast DR
OSPF Process 1 with Router ID 2.2.2.2
Interfaces
Type
Broadcast DROther
Figure 30, configure a virtual link between Switch B and Switch C to connect Area 2 to
Address: 192.168.1.2
Priority: 0
MTU: 0
Address: 192.168.1.3
Priority: 2
MTU: 0
State Cost Pri
1 100
State Cost Pri
1 0
119
GR State: Normal
GR State: Normal
DR BDR
192.168.1.1 192.168.1.3
DR BDR
192.168.1.1 192.168.1.3