Monitoring the number of active calls in a gateway from HUM

Question

Hi,
we are configuring HUM and we want to display the number of active calls in a gateway but we can't find any OID's that show exactly what we want. So we are going to use the EXPRESSION-MIB in order to calculate some values we need.
In MRTG we launch a snmpwalk query against the OID 1.3.6.1.4.1.9.9.63.1.3.1.1.9 (cvCallActiveInSignalLevel) and we count with a counter the number of rows obtained from that snmpwalk. The calculation is as follows:
@ret=snmpwalk(sigint03.'@'.'x.x.x.x'.'1.3.6.1.4.1.9.9.63.1.3.1.1.9');
foreach $campo (@ret) {
     $cuenta=$cuenta+1;
print $cuenta."\n";
But we don't know how to implement the "foreach" loop with the EXPRESSION-MIB... and we don't know any other way for getting the number of active calls.
Can anybody please help me?
Regards.

Answer 1

Hi, I've only changed the command:
snmpset -v 2c -c private router expExpressionValueType i 4
with:
snmpset -v 2c -c private router expExpressionValueType.1 i 4
and
snmpset -v 2c -c private router expExpressionValueType.2 i 4
because, an error message appeared if not using the index. So, finally, the commands used are the following:
snmpset -v 2c -c private router expNameStatus.110.110.110.110.110 i 6snmpset -v 2c -c private router expNameStatus.110.110.110.110.110 i 5snmpset -v 2c -c private router expExpressionIndex.110.110.110.110.110 gauge 1snmpset -v 2c -c private router expExpressionComment.1 octetstring "numeroEntradas"snmpset -v 2c -c private router expExpression.1 octetstring '$1 >= 0'snmpset -v 2c -c private router expObjectID.1.1 o 1.3.6.1.4.1.9.9.63.1.3.1.1.1snmpset -v 2c -c private router expExpressionValueType.1 i 4snmpset -v 2c -c private router expObjectIDWildcard.1.1 i 1snmpset -v 2c -c private router expObjectStatus.1.1 i 1snmpset -v 2c -c private router expNameStatus.110.110.110.110.110 i 1snmpset -v 2c -c private router expNameStatus.111.111.111.111.111 i 6snmpset -v 2c -c private router expNameStatus.111.111.111.111.111 i 5snmpset -v 2c -c private router expExpressionIndex.111.111.111.111.111 gauge 2snmpset -v 2c -c private router expExpressionComment.2 octetstring "sumaEntradas"snmpset -v 2c -c private router expExpression.2 octetstring 'sum($1)'snmpset -v 2c -c private router expObjectID.2.1 o expValueInteger32Val.1.0.0snmpset -v 2c -c private router expExpressionValueType.2 i 4snmpset -v 2c -c private router expObjectIDWildcard.2.1 i 1snmpset -v 2c -c private router expObjectStatus.2.1 i 1snmpset -v 2c -c private router expNameStatus.111.111.111.111.111 i 1
But there are no entries in the expValueInteger32Val OID, so later, in the sum expression, there is no elements to sum. Please, find attached 2 files with the snmpwalk outputs.
How could we get to have values in expValueTable?
Many thanks.