With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
pnniNodePreferredPgl
pnni Node Preferred Pgl
1.3.6.1.4.1.353.5.4.1.1.3.1.7
The Node ID of the node which the local node believes should be or become the peer group leader. This is also the value the local node is currently advertising in the `Preferred Peer Group Leader Node ID' field of its nodal information group within the given peer group. If a Preferred PGL has not been chosen, this attribute's value is set to (all) zero(s).
Back to PNNI-MIB MIB page.
IPHost Network monitor allows you to monitor pnniNodePreferredPgl 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.