OSPF - overload protection Part 2

This is a follow up to the last overload protection post which kind of sucked and was very long-winded considering I didn't really know what I was looking for at the time.

Here I use a different example to give OSPF some time to keep from permanently ignoring neighbors. We do this by using the the ignore-count, reset-time, and ignore-time options of the max-lsa router mode command:

R4(config-router)#max-lsa 14 50 ignore-count 2 ignore-time 3 reset-time 2

Limit reached:

Mar 1 04:08:53.359: %OSPF-4-OSPF_MAX_LSA: Maximum number of non self-generated LSA has been exceeded "ospf 1" - 15 LSAs

Neighbors come down after 1 minute:

Mar 1 04:09:53.487: %OSPF-5-ADJCHG: Process 1, Nbr 5.5.5.5 on Serial1/0 from FULL to DOWN, Neighbor Down: Interface down or detached
Mar 1 04:09:53.495: %OSPF-5-ADJCHG: Process 1, Nbr 6.6.6.6 on Serial1/0 from FULL to DOWN, Neighbor Down: Interface down or detached
Mar 1 04:09:53.547: %OSPF-5-ADJCHG: Process 1, Nbr 3.3.3.3 on FastEthernet0/1 from FULL to DOWN, Neighbor Down: Interface down or detached

Ignore time is 3 minutes and counting down, notice our current ignore-count is 1. Once this reaches 3 all neighbors will be permanently ignored.

R4#show ip ospf | section Maximum number of non self-generated
Maximum number of non self-generated LSA allowed 14
Threshold for warning message 50%
Ignore-time 3 minutes, reset-time 2 minutes
Ignore-count allowed 2, current ignore-count 1
Ignoring all neighbors due to max-lsa limit, time remaining: 00:02:36

R4#show ip ospf | section Maximum number of non self-generated
Maximum number of non self-generated LSA allowed 14
Threshold for warning message 50%
Ignore-time 3 minutes, reset-time 2 minutes
Ignore-count allowed 2, current ignore-count 1
Ignoring all neighbors due to max-lsa limit, time remaining: 00:00:05

Neighbors come back up after the ignore-timer expires and reset timer is now triggered.

Mar 1 04:12:57.060: %OSPF-4-OSPF_MAX_LSA_THR: Threshold for maximum number of non self-generated LSA has been reached "ospf 1" - 7 LSAs
Mar 1 04:12:57.072: %OSPF-5-ADJCHG: Process 1, Nbr 6.6.6.6 on Serial1/0 from LOADING to FULL, Loading Done
Mar 1 04:13:01.498: %OSPF-5-ADJCHG: Process 1, Nbr 3.3.3.3 on FastEthernet0/1 from LOADING to FULL, Loading Done
Mar 1 04:13:23.937: %OSPF-5-ADJCHG: Process 1, Nbr 5.5.5.5 on Serial1/0 from LOADING to FULL, Loading Done

The count is still 1 and reset timer counts down from 2 minutes:

R4#show ip ospf | section Maximum number of non self-generated
Maximum number of non self-generated LSA allowed 14
Threshold for warning message 50%
Ignore-time 3 minutes, reset-time 2 minutes
Ignore-count allowed 2, current ignore-count 1 - time remaining: 00:01:51

If the timer expires, ignore-count is reset to 0 and OSPF will remain stable as long as the number of LSA's received is under the max-lsa limit. However if the max-lsa is reached again (which it will do in my lab) before the reset timer expires, the ignore count will be incremented and the ignore-timer will start. Eventually the ignore-count limit will be reached and neighbors will be ignored permanently.