Monitoring ISDN E1 PRI Operational (L2) state with SNMP

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Nov 2nd, 2010
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I'm trying to find SNMP OID (and MIB in which OID contain) to monitor L2 of ISDN PRI line.

I've configured Nagios check for interface, but even serial 0/x/0:15 is up/up, that doesn't mean its working on L2.

What I need is to distinguish between states: L1/L2 DOWN, L1 ACTIVE and L2 DOWN or L2 TEI_ASSIGNED or L2 MULTIPLE_FRAME_ESTABLISHED - working line on L2.

Can you please point me to right way or OID/MIB?

I've found several discussions but any of them doesn't solving similar issue.

Thank you in advance,


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