HH3C-SMLK-MIB

All MIBs › HH3C-SMLK-MIB

Organization: Hangzhou H3C Tech. Co., Ltd.

Last Updated: 2014-07-23

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

Description: HH3C MIB for Smart Link (SMLK) providing fast active/standby uplink failover on H3C access switches.

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What Is HH3C-SMLK-MIB?

HH3C-SMLK-MIB manages the Smart Link feature on H3C access switches, a fast-convergence dual-uplink redundancy mechanism designed to address the slow failover of traditional Spanning Tree Protocol. It exposes Smart Link group configuration, preemption mode and delay, speed threshold for uplink selection, control VLAN, and associated spanning-tree instance ranges. Its monitoring value is in failover/fault visibility: tracking preemption mode, device ID, and per-port group membership reveals whether the primary uplink is active, whether a failover to the backup link has occurred, and whether preemption back to the preferred uplink is configured correctly. It functions as a vendor alternative to STP/RSTP for uplink redundancy and can coexist with IEEE 802.1D/w spanning-tree instances referenced via its instance-list objects. It is deployed on H3C access-layer switches with dual uplinks to distribution/core switches, common in campus and branch office network designs. Network engineers evaluating or troubleshooting this functionality can download the HH3C-SMLK-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in HH3C-SMLK-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 access switch

Monitoring Examples

An administrator would poll hh3cSmlkGroupTable for a given hh3cSmlkGroupID and hh3cSmlkDeviceID to check hh3cSmlkPreemptionMode and hh3cSmlkPreemptionDelay, confirming which uplink is currently active and whether automatic preemption back to the primary is configured. Checking hh3cSmlkPortTable alongside hh3cSmlkGroupRowStatus would reveal if a backup uplink port has taken over traffic, indicating the primary link has failed.

What Can Be Monitored

Smart Link group status
active vs backup uplink port
preemption mode and delay
control VLAN configuration

Imported Objects

From HH3C-OID-MIB

hh3cCommon

OBJECT-IDENTITY

From IF-MIB

InterfaceIndex

From SNMPv2-SMI

Counter64
Integer32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

From SNMPv2-TC

DateAndTime
MacAddress
RowStatus

How to Use in IPNetwork Monitor

Example using hh3cSmlkFlushCount OID:

Select an H3C access switch, dual-uplink (Smart Link redundancy) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type hh3cSmlkFlushCount into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. It reports the number of transmitted flush messages. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter64-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
hh3cSmlk	1.3.6.1.4.1.25506.2.147			This MIB defines objects for managing Smart Link. Smart Link is a feature developed to address the slow convergence issue with STP. It provides link redundancy and fast convergence in a dual uplink network, allowing the backup link to take over quickly when the primary link fails.
hh3cSmlkObject	1.3.6.1.4.1.25506.2.147.1
hh3cSmlkGroupTable	1.3.6.1.4.1.25506.2.147.1.1		not-accessible	A list of entries of a smart link group.
hh3cSmlkGroupEntry	1.3.6.1.4.1.25506.2.147.1.1.1		not-accessible	A list of parameters that describe a smart link group.
I32 hh3cSmlkGroupID	1.3.6.1.4.1.25506.2.147.1.1.1.1	Integer32	accessible-for-notify	An index that uniquely identifies an entry in the smart link group table.
MAC hh3cSmlkDeviceID	1.3.6.1.4.1.25506.2.147.1.1.1.2	MacAddress	read-only	Device ID of a smart link group. The device ID is the bridge MAC of the device.
INT hh3cSmlkPreemptionMode	1.3.6.1.4.1.25506.2.147.1.1.1.3	INTEGER	read-create	Preemption mode of a smart link group.
I32 hh3cSmlkSpeedThreshold	1.3.6.1.4.1.25506.2.147.1.1.1.4	Integer32	read-create	Speed threshold for a smart link group in speed mode. This object is valid only when the value of hh3cSmlkPreemptionMode is 'speed'.
I32 hh3cSmlkPreemptionDelay	1.3.6.1.4.1.25506.2.147.1.1.1.5	Integer32	read-create	Preemption delay for a smart link group, in the range of 0 to 300 seconds.
I32 hh3cSmlkControlVlanID	1.3.6.1.4.1.25506.2.147.1.1.1.6	Integer32	read-create	Index of the control VLAN specified for a smart link group. The value 65535 indicates that the control VLAN has not been configured.
OCT hh3cSmlkInstanceListLow	1.3.6.1.4.1.25506.2.147.1.1.1.7	OCTET STRING	read-create	Each octet contained in this value specifies an eight-instance group, with the first octet specifying instances 0 through 7, the second octet specifying instances 8 through 15, and so on. Within each octet, the most significant bit represents the highest numbered instance, and the least significant bit represents the lowest numbered instance. Each instance to which the protected VLANs of a smart link group are mapped corresponds to a bit within the value of this object. A bit with a value of '1' indicates that the VLANs mapped to the instance are protected VLANs of the smart link group. The VLANs mapped to the instance are not protected VLANs if the corresponding bit has a value of '0'. The value of this object must be set with hh3cSmlkInstanceListHigh at the same time when a SET operation is performed.
OCT hh3cSmlkInstanceListHigh	1.3.6.1.4.1.25506.2.147.1.1.1.8	OCTET STRING	read-create	Each octet contained in this value specifies an eight-instance group, with the first octet specifying instances 2048 through 2055, the second octet specifying instances 2056 through 2063, and so on. Within each octet, the most significant bit represents the highest numbered instance, and the least significant bit represents the lowest numbered instance. The most significant bit of the last octet is invalid. Each instance to which the protected VLANs of a smart link group are mapped corresponds to a bit within the value of this object. A bit with a value of '1' indicates that the VLANs mapped to the instance are protected VLANs of the smart link group. The VLANs mapped to the instance are not protected VLANs if the corresponding bit has a value of '0'. The value of this object must be set with hh3cSmlkInstanceListLow at the same time when a SET operation is performed.
ROW hh3cSmlkGroupRowStatus	1.3.6.1.4.1.25506.2.147.1.1.1.9	RowStatus	read-create	This object is responsible for managing creation, deletion, and modification of rows. The rows support active status, CreatAndGo, and destroy operations.
hh3cSmlkPortTable	1.3.6.1.4.1.25506.2.147.1.2		not-accessible	A list of port entries of a smart link group.
hh3cSmlkPortEntry	1.3.6.1.4.1.25506.2.147.1.2.1		not-accessible	A list of parameters that describe a port to be added to a smart link group.
NUM hh3cSmlkPortIfIndex	1.3.6.1.4.1.25506.2.147.1.2.1.1	InterfaceIndex	accessible-for-notify	IfIndex of a port in a smart link group.
INT hh3cSmlkPortRole	1.3.6.1.4.1.25506.2.147.1.2.1.2	INTEGER	read-create	Role of a port in a smart link group.
INT hh3cSmlkPortStatus	1.3.6.1.4.1.25506.2.147.1.2.1.3	INTEGER	read-only	Status of a port in a smart link group.
C64 hh3cSmlkFlushCountEx	1.3.6.1.4.1.25506.2.147.1.2.1.4	Counter64	read-only	Number of transmitted flush messages.
DAT hh3cSmlkLastFlushTime	1.3.6.1.4.1.25506.2.147.1.2.1.5	DateAndTime	read-only	Time when the last flush message was transmitted.
ROW hh3cSmlkPortRowStatus	1.3.6.1.4.1.25506.2.147.1.2.1.6	RowStatus	read-create	This object is responsible for managing creation, deletion, and modification of rows. The rows support active status, CreatAndGo, and destroy operations.
hh3cSmlkFlushEnableTable	1.3.6.1.4.1.25506.2.147.1.3		not-accessible	A list of ports on which flush message receiving is enabled.
hh3cSmlkFlushEnableEntry	1.3.6.1.4.1.25506.2.147.1.3.1		not-accessible	A list of parameters that describe a port on which flush message receiving is enabled.
NUM hh3cSmlkIfIndex	1.3.6.1.4.1.25506.2.147.1.3.1.1	InterfaceIndex	not-accessible	IfIndex of a port on which flush message receiving is enabled.
OCT hh3cSmlkControlVlanListLow	1.3.6.1.4.1.25506.2.147.1.3.1.2	OCTET STRING	read-write	Specifies the control VLANs used for receiving flush messages. The VLAN ID range, described by bitmap, is from 1 to 2048. The length of bitmap is 256 in bytes. Each octet within this value specifies a set of eight VLANs, with the first octet specifying VLANs 1 through 8, the second octet specifying VLANs 9 through 16, and so on. Within each octet, the most significant bit represents the highest numbered VLAN, and the least significant bit represents the lowest numbered VLAN.
OCT hh3cSmlkControlVlanListHigh	1.3.6.1.4.1.25506.2.147.1.3.1.3	OCTET STRING	read-write	Specifies the control VLANs used for receiving flush messages. The VLAN ID range, described by bitmap, is from 2049 to 4094. The length of bitmap is 256 in bytes. Each octet within this value specifies a set of eight VLANs, with the first octet specifying VLANs 2049 through 2056, the second octet specifying VLANs 2057 through 2064, and so on. Within each octet, the most significant bit represents the highest numbered VLAN, and the least significant bit represents the lowest numbered VLAN.
hh3cSmlkTrap	1.3.6.1.4.1.25506.2.147.2
hh3cSmlkTrapPrefix	1.3.6.1.4.1.25506.2.147.2.0
NTF hh3cSmlkGroupLinkActive	1.3.6.1.4.1.25506.2.147.2.0.1			A trap message is generated when the status of a port in a smart link group changes to active.

RFC description

H3C Smart Link MIB for fast network convergence, providing link redundancy and backup failover in dual uplink networks.

Start monitoring H3C access switch, dual-uplink (Smart Link redundancy) 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 HH3C-SMLK-MIB