With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdeNodePromPeerDefaultsLFSize
Cisco DLSW Node Promiscuous Peer Defaults LF Size
1.3.6.1.4.1.9.9.74.1.2.14
The default Largest Frame Size associated with the default promiscuous peer transport connection. In other words its the largest size of the INFO field (including DLC header, not including any MAC-level or framing octets).
Back to CISCO-DLSW-EXT-MIB MIB page.
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