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720 | Open Shortest Path First (OSPFv2 and OSPFv3)
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Use the following command in CONFIGURATION ROUTER OSPF mode to configure virtual links.
Use the
show ip ospf process-id virtual-links command (Figure 32-18) in the EXEC mode to view the
virtual link.
Figure 32-18. Command Example: show ip ospf process-id virtual-links
Filter routes
To filter routes, use prefix lists. OSPF applies prefix lists to incoming or outgoing routes. Incoming routes
must meet the conditions of the prefix lists, and if they do not, OSPF does not add the route to the routing
table. Configure the prefix list in CONFIGURATION PREFIX LIST mode prior to assigning it to the
OSPF process.
Command Syntax Command Mode Usage
area area-id virtual-link router-id [hello-interval
seconds | retransmit-interval seconds | transmit-delay
seconds | dead-interval seconds | authentication-key
key | message-digest-key keyid md5 key]
CONFIG-ROUTER-
OSPF-id
Configure the optional parameters of a
virtual link:
• Area ID: assigned earlier (0-65535 or
A.B.C.D)
• Router ID: IP address associated with
the virtual link neighbor
• Hello Interval Seconds: 1-8192
(default 10)
• Retransmit Interval Seconds: 1-3600
(default 5)
• Transmit Delay Seconds: 1-3600
(default 1)
• Dead Interval Seconds: 1-8192
(default 40)
• Authentication Key: 8 characters
• Message Digest Key: 1-255
• MD5 Key: 16 characters
Only the Area ID and Router ID require configuration to create a
virtual link. If no other parameter is entered, the defaults are used.
Use EITHER the Authentication Key or the Message Digest
(MD5) key.
Command Syntax Command Mode Usage
ip prefix-list prefix-name CONFIGURATION
Create a prefix list and assign it a unique
name. You are in PREFIX LIST mode.
FTOS#show ip ospf 1 virtual-links
Virtual Link to router 192.168.253.5 is up
Run as demand circuit
Transit area 0.0.0.1, via interface GigabitEthernet 13/16, Cost of using 2
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:02
FTOS#