I'm looking at SONET-MIB (RFC3593) and find it populated with some data, like sonetMediumCircuitIdentifier. But I can't find any BIP/AIS etc counters there. Are these counters not available over SNMP or are they in different MIB? I'm looking at 11.4R6, MX80, MX960, T1600, T4000. To check your box: snmpbulkwalk box 1.3.6.1.2.1.10.39|grep ifIndex -- ++ytti