ECS4660-28F_Management Guide-R03

C HAPTER 51 | IP Routing Commands
Open Shortest Path First (OSPFv3)
– 1803 –
COMMAND MODE
Router Configuration
DEFAULT SETTING
area-id: None
router-id: None
hello-interval: 10 seconds
retransmit-interval: 5 seconds
transmit-delay: 1 second
dead-interval: 40 seconds
COMMAND USAGE
◆ All areas must be connected to a backbone area (0.0.0.0) to maintain
routing connectivity throughout the autonomous system. If it not
possible to physically connect an area to the backbone, you can use a
virtual link. A virtual link can provide a logical path to the backbone for
an isolated area, or can be configured as a backup connection that can
take over if the normal connection to the backbone fails.
◆ A virtual link can be configured between any two backbone routers that
have an interface to a common non-backbone area. The two routers
joined by a virtual link are treated as if they were connected by an
unnumbered point-to-point network.
◆ Any area disconnected from the backbone must include the transit area
ID and the router ID for a virtual link neighbor that is adjacent to the
backbone.
EXAMPLE
This example creates a virtual link using the defaults for all optional
parameters.
Console(config-router)#area 3 virtual-link 192.168.0.9
Console(config-router)#