CT-BROADCAST-MIB

Description: Manages Cabletron/Enterasys broadcast storm control thresholds and suppression actions per port.

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CT-BROADCAST-MIB is a Cabletron Systems (later Enterasys Networks) proprietary MIB for managing broadcast storm control on switch ports, letting administrators set broadcast traffic thresholds and view suppression/control status. It exposes a per-port control table with slot and interface identifiers, alongside counters for total broadcast frames seen, peak broadcast rate observed, the time that peak occurred, and a configurable desired broadcast threshold used to trigger control action. Its monitoring value is centered on network health and fault detection at the switch port level: tracking ctBroadcastTotalBroadcastFrames and ctBroadcastPeakBroadcastRate per port lets an administrator identify a port experiencing a broadcast storm (often from a switching loop, misbehaving NIC, or misconfigured device), and comparing the peak rate against ctBroadcastDesiredBroadcastThreshold shows whether automatic suppression should have engaged. It is a self-contained vendor MIB layered on top of standard interface indexing (ifIndex) conventions. It was typically deployed on Cabletron/Enterasys switches in enterprise LAN environments to protect network stability from broadcast storms. Network engineers evaluating or troubleshooting this functionality can download the CT-BROADCAST-MIB file directly to load it into their MIB browser.

An administrator would poll ctBroadcastCtlTable entries by ctBroadcastCtlSlotID and ctBroadcastCtlInterface to check ctBroadcastTotalBroadcastFrames and ctBroadcastPeakBroadcastRate for a suspect port, using ctBroadcastPeakBroadcastRateTime to determine when the spike occurred. A peak rate exceeding ctBroadcastDesiredBroadcastThreshold on a specific port would reveal an active or recent broadcast storm, often caused by a network loop or a malfunctioning connected device. Clearing the counter via ctBroadcastPeakBroadcastClear and watching whether the rate climbs again helps confirm whether the storm is ongoing or was a one-time event.

Vendor-private MIB for broadcast-related management objects; vendor-specific broadcast or multicast feature monitoring.