When the congestion level goes below the congestion level configured in the chg-stpopts command, the level 3 T31 timer is stopped. An increase in congestion level or abatement to a lower congestion level restarts the timer.

The level 3 T31 timer is started when the signaling link reaches this congestion level or a higher level. This congestion level can be verified with the rtrv-stpopts command and is shown in the MTPT31CTL field. The congestion level that starts the level 3 T31 timer can be set to either congestion level 1 or congestion level 2 using the chg-stpopts command with the mtpt31ctl parameter. The signaling link becomes unaligned, and the alignment procedure is started. If the signaling link remains in the same congestion state until the level 3 T31 timer expires, the signaling link is removed from service. To help prevent this from happening, the EAGLE starts the level 3 T31 timer whenever a signaling link goes into congestion. For example, if a signaling link has a large number of retransmissions, the throughput of the signaling link could drop enough to cause congestion on that signaling link. It’s possible that a problem on a signaling link can cause that signaling link to go into congestion, even though the traffic on the linkset is not high enough to cause congestion.

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