Configuring OSPF and OSPFv3 995
Configuring Virtual Links
Beginning in Privileged EXEC mode, use the following commands to
configure OSPF Virtual Links.
Command Purpose
configure Enter global configuration mode.
router ospf Enter OSPF configuration mode.
area
area-id
virtual-link
neighbor-id
Create the OSPF virtual interface for the specified area-
id and neighbor router. The
neighbor-id
variable is the IP
address of the neighboring router.
area
area-id
virtual-link
router-id
[authentication
[message-digest | null]]
[[authentication-key
key
]
| [message-digest-key
key-
id
md5
key
]]
Create the OSPF virtual interface for the specified area-
id and neighbor router.
Use the optional parameters to configure authentication
for the virtual link. If the area has not been previously
created, it is created by this command. If the area already
exists, the virtual-link information is added or modified.
•
authentication
—Specifies authentication type.
•
message-digest
—Specifies that message-digest
authentication is used.
•
null
—No authentication is used. Overrides password or
message-digest authentication if configured for the
area.
•
md5
—Use MD5 Encryption for an OSPF Virtual Link
•
key
—Authentication key for the specified interface.
(Range: 8 bytes or less if the authentication type is
simple and 16 bytes or less if the type is encrypt.)
•
key-id
—Authentication key identifier for the
authentication type encrypt. (Range: 0-255)
area
area-id
virtual-link
neighbor-id
retransmit-
interval
seconds
Set the OSPF retransmit interval for the virtual link
interface.
The
seconds
variable is the number of seconds to wait
between retransmitting LSAs if no acknowledgement is
received. (Range: 0–3600)
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