IEEE8021-ECMP-MIB

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Organization: IEEE 802.1 Working Group

Last Updated: 2018-06-28

Category: Standard: IEEE 802, Technology: Switching/L2

Description: IEEE 802.1 MIB covering Equal Cost Multiple Paths (ECMP), with objects for Ethernet path selection and load balancing.

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What Is IEEE8021-ECMP-MIB?

IEEE8021-ECMP-MIB is a vendor-neutral IEEE 802.1Q standards MIB defining management objects for Equal Cost Multiple Paths (ECMP) in Ethernet bridged networks, an IEEE 802.1 networking/switching standard rather than a vendor product MIB. It exposes forwarding-database and flow-filter configuration objects describing how traffic is hashed and load-balanced across multiple equal-cost Ethernet paths, along with static tie-break entries for path selection. Its monitoring focus is configuration and forwarding-behavior status rather than physical hardware health: an administrator can inspect the ECMP forwarding database and flow-filter settings to confirm traffic is being load-balanced across the expected set of ports and to verify hash-generation and TTL-based filter parameters are correctly applied. As an official IEEE 802.1Q MIB it is explicitly tied to the IEEE 802.1Q standard and is meant to be implemented alongside other IEEE 802.1 bridge MIBs on a compliant device. It is used on any standards-compliant Ethernet bridge/switch that implements 802.1Q ECMP load balancing, most commonly in data-center fabric or campus core switches. Engineers implementing or auditing this functionality typically reference the IEEE8021-ECMP-MIB RFC/standard documentation for the authoritative specification.

IPNetwork Monitor allows you to monitor SNMP objects defined in IEEE8021-ECMP-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

vendor-neutral, standards-based MIB, not tied to a specific manufacturer; applies to IEEE 802.1Q-compliant Ethernet bridges/switches

Monitoring Examples

The ieee8021QBridgeEcmpFdbTable/Entry reports ieee8021QBridgeEcmpFdbPortList, the set of egress ports eligible for a given ECMP forwarding entry, while the ieee8021EcmpFlowFilterCtlTable/Entry (keyed by ieee8021EcmpFlowFilterCtlVid) exposes ieee8021EcmpFlowFilterCtlEnabled, ieee8021EcmpFlowFilterCtlHashGen, and ieee8021EcmpFlowFilterCtlTtl for per-VLAN flow-filtering behavior. An administrator would poll the FDB port list to confirm traffic for a given MAC/flow is spread across the intended multiple egress ports, and check ieee8021EcmpEctStaticTable's ieee8021EcmpEctStaticEntryTieBreakMask to verify static tie-break rules are being honored when the hash produces a tie, catching uneven load distribution across ECMP paths.

What Can Be Monitored

ECMP forwarding database port lists
per-VLAN flow-filter enablement
hash generation method
TTL-based filtering
static tie-break path selection

Imported Objects

From IEEE8021-BRIDGE-MIB

ieee8021BridgeBasePort	OBJECT-TYPE
ieee8021BridgeBasePortComponentId	OBJECT-TYPE

From IEEE8021-Q-BRIDGE-MIB

ieee8021QBridgePortVlanStatisticsEntry	OBJECT-TYPE
ieee8021QBridgeTpFdbEntry	OBJECT-TYPE

From IEEE8021-SPB-MIB

IEEE8021SpbBridgePriority
ieee8021SpbTopIx	OBJECT-TYPE
ieee8021SpbmTopSrvTableEntry	OBJECT-TYPE

From IEEE8021-TC-MIB

ieee802dot1mibs

OBJECT-IDENTITY

From Q-BRIDGE-MIB

PortList
VlanId

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter64
Integer32
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

RowStatus
TruthValue

How to Use in IPNetwork Monitor

Example using ieee8021QBridgeTpVlanPortTtlDiscards OID:

Select a device implementing IEEE8021-ECMP-MIB 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 ieee8021QBridgeTpVlanPortTtlDiscards into the Find box to locate it in the OID tree, then select it and click OK. The number of valid frames received by this port from its segment that were classified as belonging to this VLAN and that were discarded due to TTL expiry. 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 between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
ieee8021EcmpMib	1.3.111.2.802.1.1.28			MIB Module for managing systems that provide 802.1Q Equal Cost Multiple Paths. Unless otherwise indicated, the references in this MIB module are to IEEE Std 802.1Q. Copyright (C) IEEE (2018). This version of this MIB module is part of IEEE Std 802.1Q; see the draft itself for full legal notices.
ieee8021EcmpNotifications	1.3.111.2.802.1.1.28.0
ieee8021EcmpObjects	1.3.111.2.802.1.1.28.1
ieee8021QBridgeEcmpFdbTable	1.3.111.2.802.1.1.28.1.1		not-accessible	A table that contains information about unicast entries for which the device has forwarding and/or filtering information. This information is used by the ECMP next hop selection function in determining how to propagate a received frame.
ieee8021QBridgeEcmpFdbEntry	1.3.111.2.802.1.1.28.1.1.1		not-accessible	Information about a specific unicast MAC address for which the device has some forwarding and/or filtering information.
POR ieee8021QBridgeEcmpFdbPortList	1.3.111.2.802.1.1.28.1.1.1.1	PortList	read-only	The complete set of ports, in this FID, to which frames destined for this individual MAC address may be forwarded.
ieee8021EcmpFlowFilterCtlTable	1.3.111.2.802.1.1.28.1.2		not-accessible	A table flow filtering control informmation for ports in a Bridge supporting F-Tag processing.
ieee8021EcmpFlowFilterCtlEntry	1.3.111.2.802.1.1.28.1.2.1		not-accessible	An entry in the Flow Filtering Control Table for a port (CPB or PNP).
VLA ieee8021EcmpFlowFilterCtlVid	1.3.111.2.802.1.1.28.1.2.1.1	VlanId	not-accessible	A B-vID registered on the port.
T/F ieee8021EcmpFlowFilterCtlEnabled	1.3.111.2.802.1.1.28.1.2.1.2	TruthValue	read-only	Indicates whether or not flow filtering behavior is enabled on the port for the VID (true(1) is enabled, false(2) is disabled).
T/F ieee8021EcmpFlowFilterCtlHashGen	1.3.111.2.802.1.1.28.1.2.1.3	TruthValue	read-only	indicates whether or not flow hash generation is enabled on the port for the VID (true(1) is enabled, false(2) is disabled).
I32 ieee8021EcmpFlowFilterCtlTtl	1.3.111.2.802.1.1.28.1.2.1.4	Integer32	read-write	the initial TTL value for frames entering the flow filtering SPT Domain. Valid values are 1..63, zero indicates the value has not been set. This object is persistent.
ieee8021EcmpEctStaticTable	1.3.111.2.802.1.1.28.1.3		not-accessible	Table containing alternate Bridge priorities for tie-breaker masks used in selecting shared tree root bridges. The table is indexed by - ieee8021SpbTopIx from ieee8021SpbMtidStaticTable indicating the ISIS-SPB topology instance into which the bridge priority will be advertised, and - ieee8021EcmpEctStaticEntryTieBreakMask the associated tie-break mask value.
ieee8021EcmpEctStaticEntry	1.3.111.2.802.1.1.28.1.3.1		not-accessible	This entry contains information about backbone services configured on this system to be advertised by ISIS-SPB.
I32 ieee8021EcmpEctStaticEntryTieBreakMask	1.3.111.2.802.1.1.28.1.3.1.1	Integer32	not-accessible	The value used to create the Tie-Break Mask for selecting a shared tree root bridge.
IEE ieee8021EcmpEctStaticEntryBridgePriority	1.3.111.2.802.1.1.28.1.3.1.2	IEEE8021SpbBridgePriority	read-create	A Bridge Priority value to be used for selecting a shared tree root bridge, i.e., the most significant 4 bits of the Bridge Identifier. This object is persistent.
ROW ieee8021EcmpEctStaticEntryRowStatus	1.3.111.2.802.1.1.28.1.3.1.3	RowStatus	read-create	This column holds the status for this row. When the status is active, no columns of this table may be modified. All columns must have a valid value before the row can be activated. This object is persistent.
ieee8021EcmpTopSrvTable	1.3.111.2.802.1.1.28.1.4		not-accessible	Added info for SPBM PBB encapsulated services in this network.
ieee8021EcmpTopSrvEntry	1.3.111.2.802.1.1.28.1.4.1		not-accessible	This table contains additional information about backbone services configured on this system to be advertised by ISIS-SPB.
T/F ieee8021EcmpTopSrvEntryTsBit	1.3.111.2.802.1.1.28.1.4.1.1	TruthValue	read-only	If true(1), indicates the BSI transmits multicast frames on a shared tree from this CBP.
I32 ieee8021EcmpTopSrvEntryTieBreakMask	1.3.111.2.802.1.1.28.1.4.1.2	Integer32	read-only	The value used to create the Tie-Break Mask for calculating multicast trees.
ieee8021QBridgePortVlanTtlStatisticsTable	1.3.111.2.802.1.1.28.1.5		not-accessible	A table containing per-port, per-VID TTL discard statistics.
ieee8021QBridgePortVlanTtlStatisticsEntry	1.3.111.2.802.1.1.28.1.5.1		not-accessible	TTL discard statistics for a VID on an interface.
C64 ieee8021QBridgeTpVlanPortTtlDiscardsEx	1.3.111.2.802.1.1.28.1.5.1.1	Counter64	read-only	The number of valid frames received by this port from its segment that were classified as belonging to this VLAN and that were discarded due to TTL expiry. Discontinuities in the value of the counter can occur at re-initialization of the management system, and at other times as indicated by the value of ifCounterDiscontinuityTime object of the associated interface (if any).
ieee8021EcmpConformance	1.3.111.2.802.1.1.28.2
ieee8021EcmpGroups	1.3.111.2.802.1.1.28.2.1
ieee8021QBridgeEcmpFdbGroup	1.3.111.2.802.1.1.28.2.1.1			FDB Port Map for ECMP Individual address
ieee8021EcmpFlowFilterCtlGroup	1.3.111.2.802.1.1.28.2.1.2			Flow filtering control parameters on a CBP or PNP
ieee8021EcmpEctStaticGroup	1.3.111.2.802.1.1.28.2.1.3			Optional Bridge Priority for selecting shared tree root
ieee8021EcmpTopSrvGroup	1.3.111.2.802.1.1.28.2.1.4			Advertised I-SID parameters controlling multicast routing
ieee8021QBridgePortVlanTtlStatisticsGroup	1.3.111.2.802.1.1.28.2.1.5			TTL discard statistics
ieee8021EcmpCompliances	1.3.111.2.802.1.1.28.2.2
ieee8021EcmpCompliance	1.3.111.2.802.1.1.28.2.2.1			Compliance to IEEE 802.1 SPBM ECMP
ieee8021EcmpFlowFilteringCompliance	1.3.111.2.802.1.1.28.2.2.2			Compliance to IEEE 802.1 SPBM ECMP with flow filtering

RFC description

IEEE 802.1 MIB for Equal Cost Multiple Paths (ECMP) providing Ethernet path selection and load balancing management objects.

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Download IEEE8021-ECMP-MIB