3Com 4007, Руководство по внедрению, Страница: 474 / 684

474 C
HAPTER
19: O
PEN
S
HORTEST
P
ATH
F
IRST
(OSPF) R
OUTING
Transmit delay
■
The default value for the transmit delay is 1 second.
■
Set the transmit delay to an integer value greater than 0.
■
To set the transmit delay, take into account the transmission and
propagation delays for the interface.
■
Set the transmit delay according to the link speed; use a longer
transmit delay for slower link speeds.
■
The transmit delay is more effective on very low link speeds.
Hello interval
■
The default value for the Hello interval is 10 seconds.
■
The smaller the Hello interval, the faster that topological changes are
detected, although more routing traffic ensues.
■
Set the Hello interval to the same value for all routers on the same
network segment.
Dead interval
■
The default value for the dead interval is 40 seconds.
■
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.
Retransmit interval
■
The default value for the retransmit interval is 5 seconds.
■
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.
Password
■
By default, an OSPF interface does not have an associated 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.