With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdpCachePhysLocation
Cisco Discovery Protocol Cache Physical Location
1.3.6.1.4.1.9.9.23.1.2.1.1.23
Indicates the physical location, as reported by the most recent CDP message, of a connector which is on, or physically connected to, the remote device's interface over which the CDP packet is sent. This object is not instantiated if no Physical Location field (TLV) was reported by the most recently received CDP message.
Back to CISCO-CDP-MIB MIB page.
IPHost Network monitor allows you to monitor cdpCachePhysLocation on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.