3Com corebuilder 3500 Implementation Manual page 386

386 C 14: O S P F (OSPF)
HAPTER PEN HORTEST ATH IRST
The default value for the dead interval is 40 seconds.
Dead interval
Set the dead interval to 4 times the value specified for the hello timer.
Set the dead interval to the same value for all routers on the same
network segment.
The default value for the retransmit interval is 5 seconds.
Retransmit interval
Set the retransmit interval to greater than the expected round trip
delay between any two routers on the attached network.
Set the value that you specify for the retransmit interval conservatively,
to avoid needless transmissions.
Set the retransmit interval higher for serial lines and virtual links.
By default, an OSPF interface does not have an associated password.
Password
Use the same password for all routers on the same network segment.
OSPF passwords are not encrypted. Therefore, a packet analyzer can
be used to obtain the password by tapping the wire.
If no password is defined for an interface, the interface does not verify
the existence of a password on reception of a packet.