OSPF Retransmissions Limit
The OSPF Retransmissions Limit feature adds a limit to the number of retransmissions of database exchange and update packets for both demand and non-demand circuits. The retransmission of these packets stops once this retry limit is reached, thus preventing unnecessary use of the link in continual retransmission of the packets if, for some reason, a neighbor is not responding during adjacency forming. This feature module describes the change in how the Open Shortest Path First (OSPF) protocol handles retransmissions.
Restrictions For OSPF Retransmissions Limit
The limit to the number of retransmissions does not apply for update packets on nonbroadcast multiaccess (NBMA) point-to-multipoint direct circuits. In this situation, the dead timer is used to end communication with non-responding neighbors and thus stop the retransmissions.
Information About OSPF Retransmissions Limit
Overview About OSPF Retransmissions Limit
There is a limit to the number of retransmissions of database exchange and update packets for both demand and non-demand circuits. The retransmission of these packets stops once this retry limit is reached, thus preventing unnecessary use of the link in continual retransmission of the packets if, for some reason, a neighbor is not responding during adjacency forming.
The limit for both demand circuit and non-demand circuit retransmissions is 24.
The limit-retransmissions command allows you to either remove (disable) the limit or change the maximum number of retransmissions to be a number from 1 to 255.
Benefits
The limit-retransmissions command provides for backward compatibility for previous or other releases of Cisco IOS or other routers that do not have this feature.
How to Configure OSPF Retransmissions Limit
Setting OSPF Retransmission Limits
SUMMARY STEPS
- enable
- configure terminal
- router ospf process-ID
- limit retransmissions {[dc {max-number | disable }] [non-dc {max-number | disable }]}
- end
DETAILED STEPS
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
enable Example: |
Enables privileged EXEC mode.
|
| Step 2 |
configure terminal Example: |
Enters global configuration mode. |
| Step 3 |
router ospf process-ID Example: |
Configures OSPF routing process and enters OSPF router configuration mode. |
| Step 4 |
limit retransmissions {[dc {max-number | disable }] [non-dc {max-number | disable }]} Example: |
Sets the limit in the number of retransmissions of database exchange and update packets for both demand and non-demand circuits. |
| Step 5 |
end Example: |
Exits address router configuration mode and returns to privileged EXEC mode. |
Configuration Examples for OSPF Retransmissions Limit
Example: Configuring OSPF Retransmissions Limit
The following is an example of configuring OSPF retransmissions limit.
router ospf 18
limit retransmissions dc 5
Additional References for OSPF Retransmissions Limit
Related Documents
|
Related Topic |
Document Title |
|---|---|
|
Cisco IOS commands |
|
|
Configuring OSPF |
IP Routing: OSPF Configuration Guide |
|
OSPF Commands |
IP Routing: OSPF Command Reference |
Technical Assistance
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Description |
Link |
|---|---|
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Feature Information for OSPF Retransmissions Limit
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.|
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
OSPF Retransmissions Limit |
Cisco IOS XE Fuji 16.8.1a |
The OSPF Retransmissions Limit feature adds a limit to the number of retransmissions of database exchange and update packets for both demand and non-demand circuits. The retransmission of these packets stops once this retry limit is reached, thus preventing unnecessary use of the link in continual retransmission of the packets if, for some reason, a neighbor is not responding during adjacency forming. . The feature was introduced. |
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