2.10.5.3 MTP2 Link Congestion

MTP2 Link congestion is derived from the utilization of link transmissionbuffers maintained at MTP2 adaption layer and unacknowledged messages buffered at Adax MTP2 connection queue.

Comcol sysmetric framework is used to track the usage and calculating thresholds. The threshold values for congestion levels are defined in the following table:

Table 2-13 Congestion Threshold Values

Congestion Level	Threshold Level	Onset Threshold	Clear Threshold
3	Critical	95	90
2	Major	85	80
1	Minor	60	50

Based on the congestion level of Links, congestion level of Linkset is derived as per the following formula:

Congestion Level of Linkset = Max (Congestion level of all Links in the linkset )

Based on congestion Level of linkset, congestion level of RSPs with route having the same linkset are derived.

MTP2 Link Congestion Detection

For MTP2 Link Congestion detection, the congestion threshold values are used as per Congestion Threshold Values.

(Link TPS * 2 ) base is used for the base calculation of the congestion detection.

If sum of Link transmission buffer and MTP2 connection buffer queue utilization percentage is above configured threshold level, then the link is considered as congested.

Example:

Te following figure describes the MTP2 link congestion detection:

Figure 2-24 MTP2 Link Congestion Detection