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4
Example
This example creates a stub area 10.3.0.0, and assigns all interfaces with class B
addresses 10.3.x.x to the NSSA. It also instructs the router to generate external
LSAs into the NSSA when it is an NSSA ABR or NSSA ASBR.
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 unnecessary
protocol traffic. However, note that this value should be larger for virtual
links. (Range: 1-3600 seconds; Default: 5 seconds)
• transmit-delay seconds - Estimates the time required to send a link-state
update packet over the virtual link, considering the transmission and
Console(config-router)#area 10.3.0.0 nssa default-information-originate
Console(config-router)#network 10.3.0.0 255.255.0.0 area 10.2.0.0
Console(config-router)#