Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

The default OSPF static timers (5 seconds for transmission, 1 second for acceptance) ensures sufficient time for sending and resending LSAs and for system acceptance of arriving LSAs. However, some networks may require reduced intervals for LSA transmission and acceptance. Throttling timers allow for this improved convergence times.

The LSA throttling timers are configured in milliseconds, with the interval time increasing exponentially until a maximum time has been reached. If the maximum time is reached, the system, the system continues to transmit at the max-interval until twice the max-interval time has passed. At that point, the system reverts to the start-interval timer and the cycle begins again.

When you configure the LSA throttle timers, syslog messages appear, indicating the interval times, as shown below for the transmit timer (45000ms) and arrival timer (1000ms).

Mar 15 09:46:00: %STKUNIT0-M:CP %OSPF-4-LSA_BACKOFF: OSPF Process 10,Router lsa id
                                 2.2.2.2 router-id 2.2.2.2 is backed off to transmit after 45000ms
                              

Mar 15 09:46:06: %STKUNIT0-M:CP %OSPF-4-LSA_BACKOFF: OSPF Process 10,Router lsa id
                                 3.3.3.3 rtrid 3.3.3.3 received before 1000ms time