MARVELL-UDLD-MIB

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Organization: Marvell Computer Communications Ltd.

Last Updated: 2012-08-01

Category: Protocol: UDLD, Technology: Switching/L2, Vendor: Marvell

Description: Marvell Computer Communications Unidirectional Link Detection (UDLD) MIB for detecting and disabling unidirectional Ethernet links.

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What Is MARVELL-UDLD-MIB?

MARVELL-UDLD-MIB is a Marvell Computer Communications private MIB implementing Cisco's UniDirectional Link Detection (UDLD) protocol for detecting one-way Ethernet links before they cause Spanning Tree loops, registered under the RADLAN-MIB (rnd) enterprise subtree. Its rlUdldPortTable, indexed by rlUdldPortIfIndex, exposes per-port rlUdldPortAdminMode/rlUdldPortOperMode (normal, aggressive, disabled, default), rlUdldBidirectionalState (a textual convention covering shutdown, idle, detection, undetermined, and bidirectional), and rlUdldNumberOfDetectedNeighbors, while rlUdldNeighborTable — indexed by port, device ID, and port ID — tracks each detected neighbor's MAC address, name, message interval, remaining hold time, and rlUdldNeighborCurrentState (disabled, enabled, undefined, bidirectional). Two global scalars, rlUdldGlobalUDLDMode and rlUdldGlobalMessageTime, control fiber-port default behavior and probe interval switch-wide. Because rlUdldBidirectionalState directly reports whether a link has been confirmed as safely bidirectional, this MIB is highly actionable for catching miswired or one-way fiber links before they cause a network loop. It depends on InterfaceIndex from IF-MIB and MacAddress/TruthValue/RowStatus from SNMPv2-TC, and is deployed on Marvell-based (RADLAN-derived) managed Ethernet switches. Engineers debugging suspected one-way links commonly need the MARVELL-UDLD-MIB MIB Browser to interpret the bidirectional-state enumeration.

IPNetwork Monitor allows you to monitor SNMP objects defined in MARVELL-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

Marvell Prestera/RADLAN-based switch silicon and software, used as the management stack in many OEM managed Ethernet switches

Monitoring Examples

An operator polls rlUdldBidirectionalState for a fiber port suspected of a wiring fault; a value of undetermined or shutdown persisting after the configured rlUdldGlobalMessageTime interval, with rlUdldNumberOfDetectedNeighbors remaining zero, would indicate the link is not bidirectionally verified and UDLD has likely disabled the port to prevent a loop.

What Can Be Monitored

per-port UDLD admin/operational mode
port bidirectional link state
detected UDLD neighbor count and identity
neighbor message/hold-time and current state
global UDLD mode and probe message interval

Imported Objects

From IF-MIB

InterfaceIndex

From RADLAN-MIB

rnd	OBJECT-IDENTITY
rndNotifications	OBJECT-IDENTITY

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Gauge32
Integer32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

MacAddress
RowStatus
TEXTUAL-CONVENTION
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
rlUdld	1.3.6.1.4.1.89.218			This private MIB module for UDLD (Cisco Systems UniDirectional Link Detection Protocol).
rlUdldPortTable	1.3.6.1.4.1.89.218.1		not-accessible	The table holds information for Udld Ethernet ports.
rlUdldPortEntry	1.3.6.1.4.1.89.218.1.1		not-accessible	Entry in the rlUdldPortTable.
NUM rlUdldPortIfIndex	1.3.6.1.4.1.89.218.1.1.1	InterfaceIndex	not-accessible	Interface Index. This variable is the key for udld port table. uniquely identifies the udld port information.
UDL rlUdldPortAdminMode	1.3.6.1.4.1.89.218.1.1.2	UdldPortMode	read-write	This variable identifies port UDLD admin configured mode (normal, aggressive, disable).
UDL rlUdldPortOperMode	1.3.6.1.4.1.89.218.1.1.3	UdldPortMode	read-only	This variable identifies port UDLD operational mode (normal, aggressive, disable). for fiber ports it is combination of global mode and port mode
T/F rlUdldPortDefaultConfiguration	1.3.6.1.4.1.89.218.1.1.4	TruthValue	read-only	This variable indicates whether tne user configure the udld port. to present (default) or not in port configuration.
UDL rlUdldBidirectionalState	1.3.6.1.4.1.89.218.1.1.5	UdldPortBidirectionalState	read-only	This variable identifies the port UDLD status (shutdown, idle, detection, undetermined, bidirectional).
INT rlUdldNumberOfDetectedNeighbors	1.3.6.1.4.1.89.218.1.1.6	INTEGER	read-only	Number Of Detected Neighbors for this port.
rlUdldNeighborTable	1.3.6.1.4.1.89.218.2		not-accessible	The table holds information for Udld Neighbor of ethernet ports.
rlUdldNeighborEntry	1.3.6.1.4.1.89.218.2.1		not-accessible	Entry in the rlUdldNeighborTable.
NUM rlUdldNeighborPortIfIndex	1.3.6.1.4.1.89.218.2.1.1	InterfaceIndex	not-accessible	Interface Index. This variable is the key for udld port Neighbor table. uniquely identifies the udld port index.
STR rlUdldNeighborDeviceID	1.3.6.1.4.1.89.218.2.1.2	UdldString	not-accessible	The Neighbor Device-ID TLV should contain the switch base MAC address in ACSII format.
STR rlUdldNeighborPortID	1.3.6.1.4.1.89.218.2.1.3	UdldString	not-accessible	The Port-ID TLV should contain the port ACSII name as it is printed in show CLI commands.
MAC rlUdldNeighborDeviceMACAddress	1.3.6.1.4.1.89.218.2.1.4	MacAddress	not-accessible	The Neighbor mac address
STR rlUdldNeighborDeviceName	1.3.6.1.4.1.89.218.2.1.5	UdldString	read-only	The Neighbor NeighborDevice Name TLV should contain sysName in ACSII.
INT rlUdldNeighborMessageTime	1.3.6.1.4.1.89.218.2.1.6	INTEGER	read-only	The Neighbor Message Time is from Message Interval TLV. This time interval value used by a neighbor to send UDLD probes after the linkup or detection phases. Its time unit is 1 second.
INT rlUdldNeighborLeftLifeTime	1.3.6.1.4.1.89.218.2.1.7	INTEGER	read-only	The remaining holdtime for Neighbor entry in cache in seconds.
UDL rlUdldNeighborCurrentState	1.3.6.1.4.1.89.218.2.1.8	UdldNeighborCurrentState	read-only	This variable identifies the Neighbor port UDLD current status (Disabled, Enabled, Undefined, Bidirectional).
UDL rlUdldGlobalUDLDMode	1.3.6.1.4.1.89.218.3	UdldGlobalMode	read-write	Define Global UDLD Mode (normal, aggressive, disable)
INT rlUdldGlobalMessageTime	1.3.6.1.4.1.89.218.4	INTEGER	read-write	Define global value of the interval between two sent probe messages, use the udld message time command in Global Configuration mode.

RFC description

Implements Cisco's Unidirectional Link Detection (UDLD) protocol on Marvell switches for link integrity verification and detection of unidirectional failures.

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Download MARVELL-UDLD-MIB

What Is MARVELL-UDLD-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description