This is a cumulative counter of how many times this logical port's congestion state has escalated from mildly-congested to severely-congested since the last counter reset, giving a history of how often the port nears saturation. An admin trends this over time, for example as daily deltas, to spot a port that is chronically overloaded rather than relying on the instantaneous lportCongestState snapshot alone. For example, if lportSevCongests jumps by 200 in one afternoon, that link is repeatedly tipping into severe congestion and is a strong candidate for a bandwidth upgrade.