CISCOSB-Dlf-MIB

Description: Controls Destination Lookup Failure (DLF) packet flooding behavior on Cisco Small Business switches.

Start monitoring vendor-neutral, standards-based MIB, any SNMPv3-capable network device (SNMP engine identity/boot/clock status) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

CISCOSB-Dlf-MIB is a Cisco Small Business (formerly Linksys/Radlan-derived) private MIB that controls Destination Lookup Failure (DLF) handling on the switch's Layer 2 forwarding engine, specifically unknown-unicast egress flooding behavior. Rather than exposing performance counters, it mainly provides configuration objects that determine on which ports unknown-unicast traffic is flooded or filtered. Its relevance to hardware/software status monitoring is limited, but it does let an operator verify the switch's current forwarding-policy configuration state per port, which is useful when diagnosing unexpected broadcast/flood traffic or asymmetric switching behavior. It depends on the switch's underlying bridging/forwarding MIB structure and Cisco Small Business's private enterprise tree. It is deployed on small-business and SMB-class managed switches where administrators need fine control over flood behavior for security or bandwidth reasons, and administrators can download the CISCOSB-Dlf-MIB file directly to load it into their MIB browser.

An administrator would inspect rlDlfPortList to see which ports currently have unknown-unicast flooding enabled or disabled, useful when troubleshooting excessive broadcast-domain traffic reaching ports that should be isolated. This is fundamentally a configuration/state object rather than a live traffic counter, so it reveals policy misconfiguration rather than real-time faults.

Manages Cisco Small Business switch port unknown unicast egress filtering settings.