Chapter 15 - OSPF | 257 |
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ϖNote: If a router with a lower priority is the Designated Router and a new router with a higher priority comes online, the Designated Router will not change.
Authentication Key
This string sets the OSPF packet Authentication Key. The string can be between one and eight alphanumeric characters.
In order to use authentication, the OSPF Authentication Type for this inter- face should be set to Simple. (This is set in the OSPF Area Dialog Box which is discussed in the following section.)
Hello Interval
This value sets the interval, in seconds, that the router sends out OSPF keepalive packets which let other routers know the router is up.The value must be greater than one. The default settings of 10 seconds for a LAN and
30seconds for a
Dead Interval
This value sets the length of time, in seconds, that OSPF neighbors will wait without receiving an OSPF keepalive packet from a neighbor before assuming the router is down. This value must be at least twice the value of
Hello Interval.
ϖNote: Each connected router must have the same values for Hello Interval and Dead Interval or the routers will not be able to communicate. If you change the defaults on one router, you must change them on all attached routers within an area.
Transmission Delay
This value sets the amount of time added to the age of OSPF Link State Update packets before transmission. It is the estimated number of seconds to transmit a packet over the interface.
Retrans Interval
This value sets the interval, in seconds, between retransmission of Link State Update packets. The value must be between 2 and 65,535.
OSPF Area
This dialog box defines a list of OSPF Area names. An area is a generalization of an IP subnetted network within an Autonomous System (AS). An AS is a
