Installing and Administering Internet Services

268 Chapter 8
Configuring gated
Configuring the OSPF Protocol
Default: None (you must specify a value)
Range: 0 - 65535
hellointerval specifies the number of seconds between transmission
of OSPF Hello packets. Smaller intervals ensure that changes in
network topology are detected faster; however, routing traffic can
increase. A sample value for an X.25 network is 30 seconds. A sample
value for a LAN is 10 seconds.
Default: None (you must specify a value)
Range: 0 - 255
NOTE The hellointerval value must be the same for all OSPF routers.
routerdeadinterval specifies the number of seconds that hello
packets are not received from a router before it is considered “down” or
“inactive” by its neighbors. This value should be some multiple of the
hellointerval value.
Default: None (you must specify a value)
Range: 0 - 65535
NOTE The routerdeadinterval value must be the same for all OSPF
routers.
A point-to-point interface can be defined with or without a
nonbroadcast clause. If thenonbroadcast clause is specified, then the
pollinterval statement must be defined:
pollinterval specifies a rate at which hellos are sent when a
neighboring router becomes inactive. (A router is considered inactive
when hellos have not been received from the router for the amount of
time specified by the routerdeadinterval definition.) The value of
pollinterval should be larger than the value of hellointerval. A
sample value for an X.25 network is 2 minutes.
Default: None (you must specify a value)
Range: 0 - 255
If the device at the other end of the point-to-point network is not an
OSPF router, you can prevent Hello packets from being sent to it. This is
done using the stubhosts statement. stubhosts specifies the IP
address or domain name of the non-OSPF host. The cost of sending a