OSPF定时器介绍

OSPF的几个定时器：

OSPF Hello默认10s

OSPF Dead默认=4*T(Hello), 40秒

连续4次收不到Hello就Down接口

OSPF  Wait Timer

HelloInterval
-
The length of time, in seconds, between the Hello packets that the router sends on the interface.
Advertised
in
Hello packets sent out this interface.
RouterDeadInterval
-
The number of seconds before the router's neighbors will declare it down,
after
they stop hearing the
router's Hello Packets.
Advertised
in Hello packets sent out this interface.
*
Hello
Timer
-
An
interval timer that causes the interface to send a Hello packet. This timer fires every HelloInterval seconds.
*Wait
Timer
-
A single shot timer that causes the interface to exit the Waiting state, and as a consequence select a Designated
Router on the network. The length of the timer is RouterDeadInterval seconds.

HelloInterval

-

The length of time, in seconds, between the ello packets that the router sends on the interface.

Advertised

in

Hello packets sent out this interface.

RouterDeadInterval

-

The number of seconds before the router's neighbors will declare it down,

after

they stop hearing the

router's Hello Packets.

Advertised

in Hello packets sent out this interface.

*

Hello

Timer

-

An

interval timer that causes the interface to send a Hello packet. This timer fires every HelloInterval seconds.

*Wait

Timer

-

A single shot timer that causes the interface to exit the Waiting state, and as a consequence select a Designated the timer is RouterDeadInterval seconds.

文章

http://www.packet-lab.com/main/images/stories/ospftimerhellodead/ospftimershelloanddeadintervalsslides.pdf