Filter
Top Products
IP R
OUTING
C
OMMANDS
4-353
area virtual-link
This command defines a virtual link. To remove a virtual link, use the no
form with no optional keywords. To restore the default value for an attribute,
use the no form with the required keyword.
Syntax
[no] area area-id virtual-link router-id
[authentication [message-digest | null ]] [hello-interval seconds]
[retransmit-interval seconds] [transmit-delay seconds] [dead-interval
seconds] [[authentication-key key] | [message-digest-key key-id
md5 key]]
no area area-id
• area-id - Identifies the transit area for the virtual link.
(The area ID must be in the form of an IP address.)
• router-id - Router ID of the virtual link neighbor. This must be an Area
Border Router (ABR) that is adjacent to both the backbone and the
transit area at the other end of the virtual link.
• authentication - Specifies the authentication mode. If no optional
parameters follow this keyword, then plain text authentication is used
along with the password specified by the authentication-key. If
message-digest authentication is specified, then the
message-digest-key and md5 parameters must also be specified. If
the null option is specified, then no authentication is performed on
any OSPF routing protocol messages.
• message-digest - Specifies message-digest (MD5) authentication.
• null - Indicates that no authentication is used.
• hello-interval seconds - Specifies the transmit delay between sending
hello packets. Setting the hello interval to a smaller value can reduce
the delay in detecting topological changes, but will increase the routing
traffic. This value must be the same for all routers attached to an
autonomous system. (Range: 1-65535 seconds; Default: 10 seconds)
• retransmit-interval seconds - Specifies the interval at which the ABR
retransmits link-state advertisements (LSA) over the virtual link. The
retransmit interval should be set to a conservative value that provides
an adequate flow of routing information, but does not produce