With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rsrbRemotePeerTcpQueue
rsrb Remote Peer Tcp Queue
1.3.6.1.4.1.9.9.29.1.2.1.1.11
Number of packets being held by the local router in the TCP output queue to the remote peer.
Back to CISCO-RSRB-MIB MIB page.
IPHost Network monitor allows you to monitor rsrbRemotePeerTcpQueue 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.