This OID holds the low-order portion of the persistent cell-encode counter for side B (0 to 2,147,483,647), which you combine with the high-order value to get the complete odometer reading. This cumulative counter survives interface state changes and reboots, giving you a reliable accounting tool for validating that the B-side is consistently encoding and sending cells as expected. A reading of low=950,000,000 combined with high=2 would total approximately 4.95 billion cells encoded on B-side cumulatively.