With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cgspLinkifIndex
Cisco GSP Linkif Index
1.3.6.1.4.1.9.9.336.1.6.1.1.6
If the link type specified by cgspLinkType is serial or high speed Link, this is the ifIndex specified in IF-MIB, otherwise no significance is to be placed on this value.
Back to CISCO-ITP-GSP-MIB MIB page.
IPHost Network monitor allows you to monitor cgspLinkifIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.