H3C-DLDP-MIB

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Organization: Huawei 3Com Technologies Co., Ltd.

Last Updated: 2004-12-13

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

Description: H3C MIB for Device Link Detection Protocol (DLDP) detecting unidirectional link failures on fiber connections.

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What Is H3C-DLDP-MIB?

H3C-DLDP-MIB is an H3C private-enterprise MIB for the Device Link Detection Protocol (DLDP), a link-layer keepalive mechanism designed to detect unidirectional fiber-optic link failures that standard Ethernet auto-negotiation cannot catch, and to automatically shut down the affected port. It exposes global configuration (work mode, enable/reset controls, hello interval, authentication mode and password) as well as per-port operational state in a dedicated port-state table. Its monitoring focus is link/fault status: an operator checks each port's DLDP state to catch a unidirectional link before it triggers a bridging loop, and relies on trap notifications when the protocol automatically shuts down a suspect port. It operates alongside standard interface and spanning-tree MIBs (such as IF-MIB and BRIDGE-MIB) since it protects the same physical links those protocols manage. Deployment context is H3C switches interconnected via fiber-optic links in campus or data-center networks, where an undetected unidirectional link could otherwise cause a loop. Engineers can download the H3C-DLDP-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in H3C-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 switch with fiber-optic uplinks

Monitoring Examples

An administrator polls h3cDLDPPortStateTable/h3cDLDPPortStateEntry for h3cDLDPPortState on each fiber port to see whether it is normal, down, or flagged as unidirectional. h3cDLDPSystemEnable and h3cDLDPWorkMode confirm the protocol is active and operating in the intended mode, while h3cDLDPTrapObject notifications alert the operator when h3cDLDPUnidirectionalShutdown fires and the port is automatically disabled to prevent a loop.

What Can Be Monitored

per-port DLDP link state
DLDP enable state and work mode
hello interval
unidirectional-link automatic shutdown events
authentication mode

Imported Objects

From HUAWEI-3COM-OID-MIB

h3cCommon

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
h3cDldp	1.3.6.1.4.1.2011.10.2.43			HUAWEI-3COM DLDP (Device Link Detection Protocol) MIB
h3cDLDPMibObject	1.3.6.1.4.1.2011.10.2.43.1
h3cDLDPConfigGroup	1.3.6.1.4.1.2011.10.2.43.1.1
INT h3cDLDPWorkMode	1.3.6.1.4.1.2011.10.2.43.1.1.1	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 h3cDLDPSystemEnable	1.3.6.1.4.1.2011.10.2.43.1.1.2	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 h3cDLDPPortDLDPTable. If setting it to false, all the fiber ports will disable DLDP and the agent automatically destroy the corresponding rows in h3cDLDPPortDLDPTable
T/F h3cDLDPSystemReset	1.3.6.1.4.1.2011.10.2.43.1.1.3	TruthValue	read-write	DLDP reset systematically. This node only supports set operation. If the value of h3cDLDPSystemReset 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 h3cDLDPPortDLDPState is not disable, it does not change.
INT h3cDLDPInterval	1.3.6.1.4.1.2011.10.2.43.1.1.4	INTEGER	read-write	The interval of sending an advertisement PDU. unit : second
INT h3cDLDPAuthenticationMode	1.3.6.1.4.1.2011.10.2.43.1.1.5	INTEGER	read-write	Type of authentication mode.
OCT h3cDLDPAuthenticationPassword	1.3.6.1.4.1.2011.10.2.43.1.1.6	OCTET STRING	read-write	This is the password for authentication. If the value of h3cDLDPAuthenticationMode is none, the user can not set this node. If the value of h3cDLDPAuthenticationMode 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 h3cDLDPAuthenticationMode is MD5 or clear password if h3cDLDPAuthenticationMode is simple or zero length string if h3cDLDPAuthenticationMode is none.
INT h3cDLDPUnidirectionalShutdown	1.3.6.1.4.1.2011.10.2.43.1.1.7	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.
h3cDLDPPortStateTable	1.3.6.1.4.1.2011.10.2.43.1.2		not-accessible	The table of the Ethernet ports of a LAN switch.
h3cDLDPPortStateEntry	1.3.6.1.4.1.2011.10.2.43.1.2.1		not-accessible	Information about a h3cDLDPPortDLDPTable entity.
ENA h3cDLDPPortState	1.3.6.1.4.1.2011.10.2.43.1.2.1.1	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 h3cDLDPPortDLDPTable for this port. If setting it to disabled, the port will disable DLDP and the corresponding row will be destroyed in h3cDLDPPortDLDPTable.
h3cDLDPPortDLDPTable	1.3.6.1.4.1.2011.10.2.43.1.3		not-accessible	Table of a LAN switch's ports, which enable DLDP.
h3cDLDPPortDLDPEntry	1.3.6.1.4.1.2011.10.2.43.1.3.1		not-accessible	The information of a port, which enable DLDP.
DLD h3cDLDPPortDLDPState	1.3.6.1.4.1.2011.10.2.43.1.3.1.1	DLDPStatus	read-only	Operating state of DLDP on the port. It is relational with h3cDLDPPortState and h3cDLDPLinkState.
INT h3cDLDPLinkState	1.3.6.1.4.1.2011.10.2.43.1.3.1.2	INTEGER	read-only	The link state of the port.
T/F h3cDLDPPortDLDPReset	1.3.6.1.4.1.2011.10.2.43.1.3.1.3	TruthValue	read-write	DLDP reset systematically. This node only supports set operation. If the value of h3cDLDPPortDLDPReset 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.
h3cDLDPNeighborTable	1.3.6.1.4.1.2011.10.2.43.1.4		not-accessible	Table of a port's neighbors.
h3cDLDPNeighborEntry	1.3.6.1.4.1.2011.10.2.43.1.4.1		not-accessible	The information of a neighbor.
MAC h3cDLDPNeighborBridgeMac	1.3.6.1.4.1.2011.10.2.43.1.4.1.1	MacAddress	not-accessible	The bridge MAC address of a neighbor.
I32 h3cDLDPNeighborPortIndex	1.3.6.1.4.1.2011.10.2.43.1.4.1.2	Integer32	not-accessible	The port index of a neighbor.
DLD h3cDLDPNeighborState	1.3.6.1.4.1.2011.10.2.43.1.4.1.3	DLDPNeighborStatus	read-only	The state of a neighbor.
I32 h3cDLDPNeighborAgingTime	1.3.6.1.4.1.2011.10.2.43.1.4.1.4	Integer32	read-only	The aging time of a neighbor. unit: second
h3cDLDPTrapObject	1.3.6.1.4.1.2011.10.2.43.2
h3cDLDPNotification	1.3.6.1.4.1.2011.10.2.43.2.1
NTF h3cDLDPUnidirectionalPort	1.3.6.1.4.1.2011.10.2.43.2.1.1			It will send a SNMP trap when the state of a port has changed to unidirectional-link .

RFC description

Device Link Detection Protocol MIB for H3C/Huawei switches to prevent unidirectional link loops.

Start monitoring H3C switch with fiber-optic uplinks (Device Link Detection Protocol) 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 H3C-DLDP-MIB

What Is H3C-DLDP-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description