With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoDlswSdlcLsLocalBlockNum
cisco Data Link Switching Sdlc Link Station Local Block Number
1.3.6.1.4.1.9.10.9.1.6.2.1.3
The block number is the first three digits of the node_id, if available. These 3 hexadecimal digits identify the product and are not configurable.
Back to CISCO-DLSW-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoDlswSdlcLsLocalBlockNum on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.