H3C-SMLK-MIB

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Organization: Hangzhou H3C Tech. Co., Ltd.

Last Updated: 2014-07-23

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

Description: H3C MIB for Smart Link management providing sub-second link failover and load balancing in access ring topologies.

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What Is H3C-SMLK-MIB?

H3C-SMLK-MIB manages H3C's "Smart Link" feature, a fast-convergence dual-uplink redundancy mechanism designed as an alternative to slower Spanning Tree Protocol (STP) convergence in access-ring topologies. It exposes Smart Link group tables defining preemption mode/delay, a speed threshold for switchover decisions, the control VLAN used for link-state signaling, and per-group port tables identifying the primary/secondary uplink ports. This is a hardware/link-redundancy status MIB: administrators use it to verify which uplink is currently active, whether preemption back to a preferred link is pending, and to receive traps the moment a failover between primary and backup uplinks occurs. It's an H3C proprietary alternative/complement to standard STP-based MIBs (e.g., BRIDGE-MIB), not dependent on them but serving a similar redundancy purpose. It's deployed on H3C access switches in ring or dual-homed topologies where sub-second failover is required, such as metro Ethernet access rings. Engineers can download the H3C-SMLK-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in H3C-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 switches (ring/dual-uplink topology)

Monitoring Examples

An operator would poll h3cSmlkGroupTable/h3cSmlkGroupEntry (by h3cSmlkGroupID and h3cSmlkDeviceID) to check h3cSmlkPreemptionMode and h3cSmlkPreemptionDelay, confirming whether the group is configured to automatically revert to the primary uplink after it recovers. Checking h3cSmlkPortTable would show which port is currently forwarding versus blocked within the Smart Link group, and h3cSmlkSpeedThreshold indicates the link-speed floor that triggers a failover decision. An h3cSmlkTrap notification firing indicates the active uplink just switched, which the NOC would correlate with any reported ring outage.

What Can Be Monitored

active/backup uplink port state
preemption mode and delay
link speed threshold
control VLAN ID
Smart Link failover traps

Imported Objects

From HUAWEI-3COM-OID-MIB

h3cCommon

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 h3cSmlkFlushCount OID:

Select an H3C access switch, ring/dual-uplink topology (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 h3cSmlkFlushCount 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
h3cSmlk	1.3.6.1.4.1.2011.10.2.147			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.
h3cSmlkObject	1.3.6.1.4.1.2011.10.2.147.1
h3cSmlkGroupTable	1.3.6.1.4.1.2011.10.2.147.1.1		not-accessible	A list of entries of a smart link group.
h3cSmlkGroupEntry	1.3.6.1.4.1.2011.10.2.147.1.1.1		not-accessible	A list of parameters that describe a smart link group.
I32 h3cSmlkGroupID	1.3.6.1.4.1.2011.10.2.147.1.1.1.1	Integer32	accessible-for-notify	An index that uniquely identifies an entry in the smart link group table.
MAC h3cSmlkDeviceID	1.3.6.1.4.1.2011.10.2.147.1.1.1.2	MacAddress	read-only	Device ID of a smart link group. The device ID is the bridge MAC of the device.
INT h3cSmlkPreemptionMode	1.3.6.1.4.1.2011.10.2.147.1.1.1.3	INTEGER	read-create	Preemption mode of a smart link group.
I32 h3cSmlkSpeedThreshold	1.3.6.1.4.1.2011.10.2.147.1.1.1.4	Integer32	read-create	Speed threshold for a smart link group in speed mode. This object is valid only when the value of h3cSmlkPreemptionMode is 'speed'.
I32 h3cSmlkPreemptionDelay	1.3.6.1.4.1.2011.10.2.147.1.1.1.5	Integer32	read-create	Preemption delay for a smart link group, in the range of 0 to 300 seconds.
I32 h3cSmlkControlVlanID	1.3.6.1.4.1.2011.10.2.147.1.1.1.6	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 h3cSmlkInstanceListLow	1.3.6.1.4.1.2011.10.2.147.1.1.1.7	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 h3cSmlkInstanceListHigh at the same time when a SET operation is performed.
OCT h3cSmlkInstanceListHigh	1.3.6.1.4.1.2011.10.2.147.1.1.1.8	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 h3cSmlkInstanceListLow at the same time when a SET operation is performed.
ROW h3cSmlkGroupRowStatus	1.3.6.1.4.1.2011.10.2.147.1.1.1.9	RowStatus	read-create	This object is responsible for managing creation, deletion, and modification of rows. The rows support active status, CreatAndGo, and destroy operations.
h3cSmlkPortTable	1.3.6.1.4.1.2011.10.2.147.1.2		not-accessible	A list of port entries of a smart link group.
h3cSmlkPortEntry	1.3.6.1.4.1.2011.10.2.147.1.2.1		not-accessible	A list of parameters that describe a port to be added to a smart link group.
NUM h3cSmlkPortIfIndex	1.3.6.1.4.1.2011.10.2.147.1.2.1.1	InterfaceIndex	accessible-for-notify	IfIndex of a port in a smart link group.
INT h3cSmlkPortRole	1.3.6.1.4.1.2011.10.2.147.1.2.1.2	INTEGER	read-create	Role of a port in a smart link group.
INT h3cSmlkPortStatus	1.3.6.1.4.1.2011.10.2.147.1.2.1.3	INTEGER	read-only	Status of a port in a smart link group.
C64 h3cSmlkFlushCountEx	1.3.6.1.4.1.2011.10.2.147.1.2.1.4	Counter64	read-only	Number of transmitted flush messages.
DAT h3cSmlkLastFlushTime	1.3.6.1.4.1.2011.10.2.147.1.2.1.5	DateAndTime	read-only	Time when the last flush message was transmitted.
ROW h3cSmlkPortRowStatus	1.3.6.1.4.1.2011.10.2.147.1.2.1.6	RowStatus	read-create	This object is responsible for managing creation, deletion, and modification of rows. The rows support active status, CreatAndGo, and destroy operations.
h3cSmlkFlushEnableTable	1.3.6.1.4.1.2011.10.2.147.1.3		not-accessible	A list of ports on which flush message receiving is enabled.
h3cSmlkFlushEnableEntry	1.3.6.1.4.1.2011.10.2.147.1.3.1		not-accessible	A list of parameters that describe a port on which flush message receiving is enabled.
NUM h3cSmlkIfIndex	1.3.6.1.4.1.2011.10.2.147.1.3.1.1	InterfaceIndex	not-accessible	IfIndex of a port on which flush message receiving is enabled.
OCT h3cSmlkControlVlanListLow	1.3.6.1.4.1.2011.10.2.147.1.3.1.2	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 h3cSmlkControlVlanListHigh	1.3.6.1.4.1.2011.10.2.147.1.3.1.3	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.
h3cSmlkTrap	1.3.6.1.4.1.2011.10.2.147.2
h3cSmlkTrapPrefix	1.3.6.1.4.1.2011.10.2.147.2.0
NTF h3cSmlkGroupLinkActive	1.3.6.1.4.1.2011.10.2.147.2.0.1			A trap message is generated when the status of a port in a smart link group changes to active.

RFC description

Smart Link MIB for H3C/Huawei devices providing fast convergence and link redundancy.

Start monitoring H3C access switch, ring/dual-uplink topology (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 H3C-SMLK-MIB