With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
portSelGrpTable
port Select Group Table
1.3.6.1.4.1.9.10.16.1.1.1
Controls the setup of port and ATM connection selection criteria used on behalf of any collection associated with entries in this table (e.g., atmHostTable). This table allows portSelTable entries with the same value of the portSelCollectGroup object to be grouped together to form port select groups. Note that an agent implementation may restrict the actual number of portSelGrp entries, due to resource limitations.
Back to ATM-RMON-MIB MIB page.
IPHost Network monitor allows you to monitor portSelGrpTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.