Configuring gated

Configuring the OSPF Protocol

•A point-to-point network is a network that joins a single pair of routers. An example of a point-to-point network is a 56-KB serial line.

The following sections describe each type of interface.

Multicast Interfaces On multicast networks, an OSPF router dynamically detects its neighbor routers through the OSPF Hello message. The following statements are defined for a multicast interface:

•retransmitinterval is the number of seconds between retransmission of link states, database descriptions, and link state request packets. This value must exceed the expected round-trip delay between any two routers in the network. A sample value for a LAN is 5 seconds.

Default: None (you must specify a value)

Range: Integer between 0 – 65535

•transitdelay is the number of seconds to transmit a Link State Update Packet over this interface. This value must take into account the transmission and propagation delays for the interface. It must be greater than 0. A sample value for a LAN is 1 second.

Default: None (you must specify a value)

Range: Integer between 1 – 65535

•priority specifies the priority of the router to be the designated router. You must configure this value only for interfaces to multi-access networks. This value specifies the priority of the router to be the designated router. When two routers attached to a network attempt to be the designated router, the one with the higher router priority value takes precedence.

Default: None (you must specify a value for multi-access networks)

Range: 8-bit unsigned integer between 0 – 255. 0 means that the router is ineligible to become a designated router on the attached network.

•hellointerval specifies the time interval (in seconds) for the transmission of OSPF Hello packets. Smaller intervals ensure that changes in network topology are detected faster. A sample value for an X.25 network is 30 seconds. A sample value for a LAN is 10 seconds.

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Chapter 3