With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoDlswDirMacLocationType
cisco Data Link Switching Directory Mac Location Type
1.3.6.1.4.1.9.10.9.1.4.2.1.1.5
The location of the resource (or a collection of resources using a mask) of this conceptual row is either (1) local - the resource is reachable via an interface, or (2) remote - the resource is reachable via a partner DLSw node (or a set of partner DLSw nodes).
Back to CISCO-DLSW-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoDlswDirMacLocationType on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.