7-10 CHAPTER 7: ROUTING WITH OSPF
Area ID
The area ID associates the router interface with an OSPF area. See
Chapter 13, “Administering OSPF Routing,” for more information.
CAUTION: Set the area ID to the same value for all routers on the
network segment because they are in the same area.
Cost
The interface cost parameter reflects the line speed of the port. Although
the system calculates a default cost based on the module media type, you
can set the cost manually to a different value. In most cases, you can
accept the default value set by the system.
Delay
The system adds the OSPF interface transmit delay (in seconds) to all LSAs
that it sends out to the network.
Set the transmit delay according to the link speed; use a longer transmit
delay for slower link speeds.
Default The default delay is 1 second.
Hello Timer
The hello timer (in seconds) determines how often the interface transmits
hello packets to other routers. Hello packets notify other routers that the
sending router is still active on the network. If a router does not send
hello packets for the period of time specified by the dead interval, that
router is considered inactive by its neighbors. For more information, see
“Dead Interval,” later in this chapter.
Default The default value for the hello timer is 10 seconds.
CAUTION: Set the hello timer to the same value for all routers on the
same network segment.
Retransmit Timer
The retransmit interval (in seconds) determines how often the interface
retransmits LSAs to other routers.
Default The default value for the retransmit timer is 5 seconds.
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