David’s Cisco Networking Blog

Oct 5 2008   8:06PM GMT

How to set OSPF Limit Retransmissions using OSPF to help the system admin

David Davis David Davis Profile: David Davis

The limit for demand and non-demand circuits is set to 24 by default. Sometimes that’s not enough time to ensure that all our data packets are arriving successfully. That’s when this command comes in handy.

Here is the command for limit retransmissions:

limit retransmissions {[dc {max-number | disable}] [non-dc {max-number | disable}]}

The max number is 255 and the disable removes the limit to the number of retransmissions.

It’s basically a 2 step process. Let’s look at some examples to see how simple it is to set this variable.
1. Access your router in configuration mode and access the ospf process
router(config)# router ospf

2. Sets the limit of number of retransmissions for the demand(dc) and non-demand(non-dc)
circuits. We will change the dc circuits to 20 and the non-dc circuits to 30.
router(config-router)# limit retransmissions dc 20 non-dc 30

3. Sets the maximum number of dc retransmissions to 20, and removes the limit for the number of non-dc circuits:
router(config-router)# limit retransmissions dc 20 non-dc disable

4. This command resets the limit retransmissions back to the default of 24:
router(config-router)# no limit retransmissions

For further information and restrictions on limit retransmission, see the Cisco article, OSPF Retransmissions Limit.

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