With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvpdnSessionCurrentWindowSize
cvpdn Session Current Window Size
1.3.6.1.4.1.9.10.51.1.2.1.1.16
This object returns the local send window size for this session. If the value of the object cvpdnSessionSequencingState is none(1) then this object should not be interpreted.
Back to CISCO-VPDN-MGMT-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cvpdnSessionCurrentWindowSize 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.