D-Link DGS-6600-48T Cli Reference Manual page 62

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Examples
Switch > enable
Switch # configure terminal
Switch (config) # router ipv6 ospf
Switch (config-router)# area 1 virtual-link 192.168.255.1
CLI Reference Guide
In OSPF, all non-backbone areas must be connected to a backbone area. If the
connection to the backbone is lost, the virtual link repairs the connection. Virtual
links can be configured between any two backbone-routers that have an
interface to a common non-backbone area. The protocol treats these two routers
joined by a virtual link as if they were connected by an un-numbered point-to-
point network. To configure a virtual link, include both the transit area ID and the
corresponding virtual link neighbor's router ID in the virtual link neighbor.
Configure the hello-interval to be the same for all routers attached to a common
network. A short hello interval results in the router detecting topological changes
faster but also an increase in the routing traffic.
As with the hello interval, the value of dead-interval must be the same for all
routers and access servers attached to a common network.
The retransmit-interval is the expected round-trip delay between any two
routers in a network. Set the value to be greater than the expected round-trip
delay to avoid needless retransmissions.
The transmit-delay is the time taken to transmit a link state update packet on the
interface. Before transmission, the link state advertisements in the update
packet, are incremented by this amount. Set the transmit-delay to be greater
than zero. Also, take into account the transmission and propagation delays for
the interface.
To configure a virtual link in OSPF for IPv6, a router ID must be used instead of
an address. In the IPv6 version of OSPF, the virtual link takes the router ID rather
than the IPv6 prefix of the remote router.
The following example establishes a virtual link with default values for all optional
parameters.
area virtual-link (IPv6)
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