EdgeSwitch-UDLD-MIB

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Organization: Broadcom Inc

Last Updated: 2008--0-2-

Category: Protocol: UDLD, Vendor: EdgeSwitch/Ubiquiti

Description: Ubiquiti EdgeSwitch UDLD (Unidirectional Link Detection) MIB for detecting and disabling unidirectional Ethernet links.

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What Is EdgeSwitch-UDLD-MIB?

This MIB is a Ubiquiti Networks private module for EdgeSwitch (FastPath-based) switches, covering Unidirectional Link Detection (UDLD) — a Layer 2 protocol that detects Ethernet links that are only passing traffic in one direction. It exposes configuration data such as global UDLD mode, message/timeout intervals, and per-interface UDLD administrative mode and aggressive-mode settings, alongside operational status per interface. It is used primarily to monitor the software-reported link health/operational status of switch ports, flagging unidirectional link faults before they cause spanning-tree loops or blackholed traffic — a fault-detection rather than hardware-sensor function. It builds on the vendor's Broadcom FastPath agent framework rather than a formal IETF UDLD standard, since UDLD has no IETF MIB. It is typically deployed on Ubiquiti EdgeSwitch access/aggregation switches to catch miswired or partially-failed fiber/copper links in enterprise or campus networks, and administrators can download the EdgeSwitch-UDLD-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in EdgeSwitch-UDLD-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Ubiquiti EdgeSwitch
Broadcom FastPath-based Ethernet switches

Monitoring Examples

An admin would poll agentUdldInterfaceTable/agentUdldInterfaceEntry per-port to read agentUdldInterfaceOperStatus and agentUdldInterfaceAdminMode, checking whether UDLD is enabled and whether it reports the link as bidirectional or unidirectional on each port. Persistent unidirectional status on a port with agentUdldInterfaceAggresiveMode enabled indicates the switch will soon shut the port down, so this is a leading indicator of an impending link fault. agentUdldGlobalMode, agentUdldMessageInterval, and agentUdldTimeoutInterval let the admin confirm the global feature is active and tuned appropriately, while agentUdldReset can be used to clear a stuck condition.

What Can Be Monitored

UDLD global mode
message interval
timeout interval
per-interface UDLD admin mode
per-interface operational (bidirectional/unidirectional) status
aggressive mode setting

Imported Objects

From EdgeSwitch-REF-MIB

fastPath

OBJECT-IDENTITY

From IF-MIB

ifIndex

OBJECT-TYPE

From RFC1213-MIB

DisplayString

From SNMPv2-SMI

Integer32
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TEXTUAL-CONVENTION
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
fastPathUdld	1.3.6.1.4.1.4413.1.1.54			The Ubiquiti Private MIB for FastPath UDLD.
agentUdldMIBObjects	1.3.6.1.4.1.4413.1.1.54.1
agentUdldGlobal	1.3.6.1.4.1.4413.1.1.54.1.1
INT agentUdldGlobalMode	1.3.6.1.4.1.4413.1.1.54.1.1.1	INTEGER	read-write	Indicates the mode of UDLDP feature on the device. enable -- Unidirectional Link Detection Protocol is enabled on the device. disable -- Unidirectional Link Detection Protocol is disabled on the device.
INT agentUdldMessageInterval	1.3.6.1.4.1.4413.1.1.54.1.1.2	INTEGER	read-write	Indicates interval in seconds at which each port sends a packet to all of its neighbors at steady state when the link has been identified as bidirectional.
INT agentUdldTimeoutInterval	1.3.6.1.4.1.4413.1.1.54.1.1.3	INTEGER	read-write	Indicates Timeout interval in seconds.
INT agentUdldReset	1.3.6.1.4.1.4413.1.1.54.1.1.4	INTEGER	read-write	Resets all interfaces that have been shutdown by UDLD. On read OID will always be 0.
agentUdldInterface	1.3.6.1.4.1.4413.1.1.54.1.2
agentUdldInterfaceTable	1.3.6.1.4.1.4413.1.1.54.1.2.1		not-accessible	The table containing the status of UDLDP on the device's interfaces.
agentUdldInterfaceEntry	1.3.6.1.4.1.4413.1.1.54.1.2.1.1		not-accessible	An entry exists for each interface that supports UDLDP.
INT agentUdldInterfaceOperStatus	1.3.6.1.4.1.4413.1.1.54.1.2.1.1.1	INTEGER	read-only	This mib object contains the following values, which has the meaning as: 'shutdown' - An Unidirectional link has been detected and the port has been disabled. 'undetermined' - Unidirectional Link Detection protocol has not collected enough information to determine if the link is bidirectional or not. 'biDirectional' - A bidirectional link has been detected. 'notApplicable' - Unidirectional Link Detection Protocol is disabled. 'undetermined-LinkDown' - The port would transition into this state when the port link physically goes down due to any reasons other than the port been put into D-Disable mode by UDLD protocol on the switch.
INT agentUdldInterfaceAdminMode	1.3.6.1.4.1.4413.1.1.54.1.2.1.1.2	INTEGER	read-write	Indicates the Administrative mode of Unidirectional Link Detection Protocol Feature configured on this interface. enable -- Unidirectional Link Detection Protocol is enabled on this interface. disable -- Unidirectional Link Detection Protocol is disabled on this interface.
T/F agentUdldInterfaceAggresiveMode	1.3.6.1.4.1.4413.1.1.54.1.2.1.1.3	TruthValue	read-write	Indicates the mode of UDLDP feature on the interface. TRUE -- Aggressive mode is enabled on the interface. FALSE -- Aggressive mode is disabled on the interface.

RFC description

Manages UDLD (Unidirectional Link Detection Protocol) on EdgeSwitch devices to detect and prevent unidirectional link issues.

Start monitoring Ubiquiti EdgeSwitch (Broadcom FastPath-based) switch (Unidirectional Link Detection) 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.

Download EdgeSwitch-UDLD-MIB

What Is EdgeSwitch-UDLD-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description