tune ospf timer

[acbennyma]

Hi all,

By default, ospf will send 4 hello packet for every ten seconds, if there is no reply within 40 seconds, this ospf will be declared as down. If I want shorten the ospf time. Let's say, I want to declare the ospf neighbor is alive or not within 8 seconds. Then,  which method below I need to choose?

(Method 1)

int gi1/0/1

ip ospf hello-interval 2

(Method 2)

int gi1/0/1

ip ospf dead-interval 8

(Method 3)

int gi1/0/1

ip ospf hello-interval 2

ip ospf dead-interval 8

[Thotsaphon Lueangwattanaphong]

Hi,

 By default, ospf will send 4 hello packet for every ten seconds, if there is no reply within 40 seconds, this ospf will be declared as down. 

       Wrong. It depends on OSPF network types. OSPF sends a hello every 10 seconds on Point-To-Point network type by default.

   You just change the hello-interval then the device will adjust dead-interval for you autometically. Just check by using a "show ip ospf interface" command.

HTH,

Toshi

[Joseph W. Doherty]

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Posting

Method 1 unless you also desire to change the number of missed hellos.

PS:

BTW, later IOSs support subsecond and/or OSPF with BFD which allows you to detect down neighbors in under a seconds.

PPS:

Toshi is correct about default time varies.