The value of tmnxWlanGwSubIfPmWatermarkLow specifies the low value of the watermarks used to determine if a new prefix should be allocated or an old prefix should be removed. A new prefix will be allocated when the total usage level for the ISA reaches the high watermark. A prefix will be freed if no addresses are currently in use and the usage level without this prefix would be below the low watermark. Values allowed for low watermark are [50..98]. The 'no' form of the corresponding CLI command resets the watermarks to its default values of 95% high and 90% low.