With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoDlswTConnTcpConfigMaxSegmentSize
cisco Data Link Switching T Connection Tcp Config Max Segment Size
1.3.6.1.4.1.9.10.9.1.2.4.1.1.1.3
This is the number of bytes that this node is willing to receive over the read TCP connection(s). Changes take effect for new transport connections.
Back to CISCO-DLSW-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoDlswTConnTcpConfigMaxSegmentSize 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.