D-Link DGS-6604 Product Manual - Page 58
Default, Command Mode, Usage Guideline, area virtual-link authentication
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DGS-6604 m Default Command Mode Usage Guideline • AREA-ID: None area virtual-link • ROUTER-ID: None • authentication: null • hello-interval:10 seconds • dead-interval: 40 seconds • transmit-delay: 1 second • retransmit-interval: 5 seconds • authentication-key: None • message-digest-key: None Router configuration In OSPF, all non-backbone areas must be connected to a backbone area. If the connection to the backbone is broken, the virtual link is used to re-establish the connection. Virtual links between any two backbone-routers that have an interface to a common non-backbone area can be configured. The protocol treats these two routers joined by a virtual link as if they were connected by an unnumbered 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. Before using the area virtual-link authentication command, configure a password for virtual link using the area virtual-link authentication-key command. If the area virtual-link authentication message-digest command is used, configure the message-digest key for the virtual link using area virtual-link message-digest-key command. CLI Reference Guide 48