With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dlswNodeVendorID
dlsw Node Vendor ID
1.3.6.1.4.1.2011.2.34.1.2
The value identifies the manufacturer's IEEE-assigned organizationally Unique Identifier (OUI) of this DLSw. This information is reported in DLSw Capabilities Exchange.
Back to DLSW-MIB MIB page.
IPHost Network monitor allows you to monitor dlswNodeVendorID 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.