Serial Interfaces RFC 2494-6
Serial Interfaces (DS0/DS1/E1/DS3/E3/SONET/SDH)
- Use of PerfHist counters which are GAUGE
- current values can decrease
- Some IP devices keep only current 15 minutes others can keep complete 24 hours worth of 15 minute statistics.
- No requirement for 15 minute intervals to match current wall clock time.