HH3C-DLDP-MIB

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Organization: Hangzhou H3C Tech. Co., Ltd.

Last Updated: 2004-12-13

Category: Technology: Loop Detection, Technology: Switching/L2, Vendor: H3C/HH3C

Description: Manages H3C Device Link Detection Protocol (DLDP) for unidirectional link detection on switch ports.

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What Is HH3C-DLDP-MIB?

HH3C-DLDP-MIB is an H3C proprietary MIB for the Device Link Detection Protocol (DLDP), used to detect unidirectional links on switch ports that standard link-state detection cannot catch. It exposes global DLDP settings (work mode, system enable/reset, detection interval, authentication mode and password) as well as a per-port state table and a per-port DLDP configuration table. Its monitoring value is software/link-health focused: the per-port DLDP state reveals whether a port has been detected as unidirectional and potentially shut down (hh3cDLDPUnidirectionalShutdown), which is critical for catching fiber miswiring or one-way optical faults before they cause spanning-tree loops. It is a vendor-specific protocol MIB that complements standard IF-MIB port status by adding link-directionality detection not covered by IEEE 802.3/802.1D standards. It is deployed on H3C switches using fiber-optic uplinks where unidirectional link faults are a known risk. Engineers can download the HH3C-DLDP-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in HH3C-DLDP-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

H3C switches

Monitoring Examples

An administrator would poll hh3cDLDPPortStateTable/hh3cDLDPPortStateEntry to check hh3cDLDPPortState for each port, looking for a port reported as unidirectional after being flagged by hh3cDLDPUnidirectionalShutdown, which would explain an unexpected port shutdown despite the link light being up. Checking hh3cDLDPInterval and hh3cDLDPAuthenticationMode against hh3cDLDPSystemEnable would confirm DLDP is actively probing that port at the expected cadence. The hh3cDLDPTrapObject group would notify the admin in real time when a unidirectional link is first detected.

What Can Be Monitored

per-port DLDP state (bidirectional/unidirectional)
DLDP detection interval
authentication mode for DLDP packets
unidirectional-link auto-shutdown status

Imported Objects

From HH3C-OID-MIB

hh3cCommon

OBJECT-IDENTITY

From RFC1213-MIB

ifIndex

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

From SNMPv2-TC

MacAddress
TEXTUAL-CONVENTION
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
hh3cDldp	1.3.6.1.4.1.25506.2.43			H3C DLDP (Device Link Detection Protocol) MIB
hh3cDLDPMibObject	1.3.6.1.4.1.25506.2.43.1
hh3cDLDPConfigGroup	1.3.6.1.4.1.25506.2.43.1.1
INT hh3cDLDPWorkMode	1.3.6.1.4.1.25506.2.43.1.1.1	INTEGER	read-write	The work mode of DLDP. Normal mode means DLDP does not detect neighbor on its own initiative when all neighbors aged. Enhance mode means DLDP detects neighbor on its own initiative when all neighbors aged.
T/F hh3cDLDPSystemEnable	1.3.6.1.4.1.25506.2.43.1.1.2	TruthValue	read-write	DLDP enable or disable systematically. This node only supports set operation. If setting it to true, all the fiber ports will enable DLDP and the agent automatically creates new rows for each port in hh3cDLDPPortDLDPTable. If setting it to false, all the fiber ports will disable DLDP and the agent automatically destroy the corresponding rows in hh3cDLDPPortDLDPTable
T/F hh3cDLDPSystemReset	1.3.6.1.4.1.25506.2.43.1.1.3	TruthValue	read-write	DLDP reset systematically. This node only supports set operation. If the value of hh3cDLDPSystemReset is true, and the current state is disable, it will change to inactive while the port is down or active while the port is up. If hh3cDLDPPortDLDPState is not disable, it does not change.
INT hh3cDLDPInterval	1.3.6.1.4.1.25506.2.43.1.1.4	INTEGER	read-write	The interval of sending an advertisement PDU. unit : second
INT hh3cDLDPAuthenticationMode	1.3.6.1.4.1.25506.2.43.1.1.5	INTEGER	read-write	Type of authentication mode.
OCT hh3cDLDPAuthenticationPassword	1.3.6.1.4.1.25506.2.43.1.1.6	OCTET STRING	read-write	This is the password for authentication. If the value of hh3cDLDPAuthenticationMode is none, the user can not set this node. If the value of hh3cDLDPAuthenticationMode is simple or MD5, the user must set this node with a string. When the user get or walk this node, it displays cipher password if hh3cDLDPAuthenticationMode is MD5 or clear password if hh3cDLDPAuthenticationMode is simple or zero length string if hh3cDLDPAuthenticationMode is none.
INT hh3cDLDPUnidirectionalShutdown	1.3.6.1.4.1.25506.2.43.1.1.7	INTEGER	read-write	The mode of unidirectional shutdown. It indicates the shutdown mode when a unidirectional link happened. Auto mode means the port will be shut down automatically when DLDP detects unidirectional link. Manual mode means the port needs to be shut down by the administrator manually when DLDP detects unidirectional link.
hh3cDLDPPortStateTable	1.3.6.1.4.1.25506.2.43.1.2		not-accessible	The table of the Ethernet ports of a LAN switch.
hh3cDLDPPortStateEntry	1.3.6.1.4.1.25506.2.43.1.2.1		not-accessible	Information about a hh3cDLDPPortDLDPTable entity.
ENA hh3cDLDPPortState	1.3.6.1.4.1.25506.2.43.1.2.1.1	EnabledStatus	read-write	State of a port. If setting it to enabled, the port will enable DLDP and a new row will be added in hh3cDLDPPortDLDPTable for this port. If setting it to disabled, the port will disable DLDP and the corresponding row will be destroyed in hh3cDLDPPortDLDPTable.
hh3cDLDPPortDLDPTable	1.3.6.1.4.1.25506.2.43.1.3		not-accessible	Table of a LAN switch's ports, which enable DLDP.
hh3cDLDPPortDLDPEntry	1.3.6.1.4.1.25506.2.43.1.3.1		not-accessible	The information of a port, which enable DLDP.
DLD hh3cDLDPPortDLDPState	1.3.6.1.4.1.25506.2.43.1.3.1.1	DLDPStatus	read-only	Operating state of DLDP on the port. It is relational with hh3cDLDPPortState and hh3cDLDPLinkState.
INT hh3cDLDPLinkState	1.3.6.1.4.1.25506.2.43.1.3.1.2	INTEGER	read-only	The link state of the port.
T/F hh3cDLDPPortDLDPReset	1.3.6.1.4.1.25506.2.43.1.3.1.3	TruthValue	read-write	DLDP reset systematically. This node only supports set operation. If the value of hh3cDLDPPortDLDPReset is true, and the current state is disable, it will change to inactive while the port is down or active while the port is up.
hh3cDLDPNeighborTable	1.3.6.1.4.1.25506.2.43.1.4		not-accessible	Table of a port's neighbors.
hh3cDLDPNeighborEntry	1.3.6.1.4.1.25506.2.43.1.4.1		not-accessible	The information of a neighbor.
MAC hh3cDLDPNeighborBridgeMac	1.3.6.1.4.1.25506.2.43.1.4.1.1	MacAddress	not-accessible	The bridge MAC address of a neighbor.
I32 hh3cDLDPNeighborPortIndex	1.3.6.1.4.1.25506.2.43.1.4.1.2	Integer32	not-accessible	The port index of a neighbor.
DLD hh3cDLDPNeighborState	1.3.6.1.4.1.25506.2.43.1.4.1.3	DLDPNeighborStatus	read-only	The state of a neighbor.
I32 hh3cDLDPNeighborAgingTime	1.3.6.1.4.1.25506.2.43.1.4.1.4	Integer32	read-only	The aging time of a neighbor. unit: second
hh3cDLDPTrapObject	1.3.6.1.4.1.25506.2.43.2
hh3cDLDPNotification	1.3.6.1.4.1.25506.2.43.2.1
NTF hh3cDLDPUnidirectionalPort	1.3.6.1.4.1.25506.2.43.2.1.1			It will send a SNMP trap when the state of a port has changed to unidirectional-link .

RFC description

Device Link Detection Protocol (DLDP) implementation for detecting unidirectional links and preventing layer 2 loop communication.

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Download HH3C-DLDP-MIB

What Is HH3C-DLDP-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description