Juniper-BRIDGE-MIB

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Organization: Juniper Networks, Inc.

Last Updated: 2003-11-04

Category: Technology: Bridging, Vendor: Juniper

Description: Defines managed objects for IEEE 802.1D bridge functionality monitoring on Juniper Networks E-series platforms.

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What Is Juniper-BRIDGE-MIB?

Juniper-BRIDGE-MIB is a Juniper Networks enterprise MIB that models IEEE 802.1D transparent bridging functionality on Juniper E-series edge routers. It exposes data about bridge interfaces, their mapping to underlying router interfaces, configured MAC learning limits, and dynamically learned MAC-to-port associations that age out over time. While primarily a configuration/topology MIB, it does support monitoring of software-level bridging state such as interface row status (active/creating/failed), MAC address table occupancy, and aging counters that reveal whether the learning table is thrashing or nearing capacity. It complements the standard IETF BRIDGE-MIB and IF-MIB by adding Juniper-specific bridge-to-interface layering constructs. It is typically deployed on Juniper E-series broadband edge routers running Layer 2 bridged access or aggregation services. Engineers can download the Juniper-BRIDGE-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in Juniper-BRIDGE-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

Juniper E-series edge router
broadband access/aggregation router

Monitoring Examples

An administrator polls juniBridgeIfTable/juniBridgeIfEntry to check juniBridgeIfRowStatus and juniBridgeIfMaxLearnCount for each bridge interface, confirming the interface is active and has not hit its configured MAC learning ceiling. Cross-referencing juniBridgeIfLowerIfIndex against juniBridgeIfIndex maps each virtual bridge interface back to its physical or logical parent interface for troubleshooting. Polling juniBridgeAgeTable/juniBridgeAgeEntry (juniBridgeMacAddress, juniBridgeAge) shows which MAC addresses are aging out, revealing flapping hosts or an oversubscribed bridge domain. A rising juniBridgeMiscCounters value alongside a full learn table often signals a bridging loop or MAC table exhaustion.

What Can Be Monitored

bridge interface status
MAC learning limit utilization
learned MAC address table
MAC address aging
bridge-to-interface mapping
bridging error counters

Imported Objects

From IF-MIB

InterfaceIndex
InterfaceIndexOrZero

From Juniper-MIBs

juniMibs

MODULE-IDENTITY

From Juniper-TC

JuniNextIfIndex

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

MacAddress
RowStatus

How to Use in IPNetwork Monitor

Example using juniBridgeDupMacCounter OID:

Select a Juniper E-series edge router (802.1D transparent bridging) 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 juniBridgeDupMacCounter into the Find box to locate it in the OID tree, then select it and click OK. The total number of duplicate mac entries found for this bridge group. 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 Counter32-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
juniBridgeMIB	1.3.6.1.4.1.4874.2.2.63			The Bridge MIB for the Juniper enterprise.
juniBridgeIfLayer	1.3.6.1.4.1.4874.2.2.63.1
JUN juniBridgeIfNextIfIndex	1.3.6.1.4.1.4874.2.2.63.1.1	JuniNextIfIndex	read-only	Coordinate ifIndex value allocation for entries in juniBridgeIfTable. A GET of this object returns the next available ifIndex value to be used to create an entry in the associated interface table; or zero, if no valid ifIndex value is available. This object also returns a value of zero when it is the lexicographic successor of a varbind presented in an SNMP GETNEXT or GETBULK request, for which circumstance it is assumed that ifIndex allocation is unintended. Successive GETs will typically return different values, thus avoiding collisions among cooperating management clients seeking to create table entries simultaneously.
juniBridgeIfTable	1.3.6.1.4.1.4874.2.2.63.1.2		not-accessible	This table contains entries for Bridge interfaces present in the system.
juniBridgeIfEntry	1.3.6.1.4.1.4874.2.2.63.1.2.1		not-accessible	Each entry describes the characteristics of a Bridge interface. Creating/deleting entries in this table causes corresponding entries for be created/deleted in ifTable/ifXTable/juniIfTable.
NUM juniBridgeIfIndex	1.3.6.1.4.1.4874.2.2.63.1.2.1.1	InterfaceIndex	not-accessible	The ifIndex of the Bridge interface. When creating entries in this table, suitable values for this object are determined by reading juniBridgeIfNextIfIndex.
ROW juniBridgeIfRowStatus	1.3.6.1.4.1.4874.2.2.63.1.2.1.2	RowStatus	read-create	Controls creation/deletion of entries in this table according to the RowStatus textual convention, constrained to support the following values only: createAndGo destroy To create an entry in this table, the following entry objects MUST be explicitly configured: juniBridgeIfRowStatus juniBridgeIfLowerIfIndex In addition, when creating an entry the following conditions must hold: A value for juniBridgeIfIndex must have been determined previously, by reading juniBridgeIfNextIfIndex. A corresponding entry in ifTable/ifXTable/juniIfTable is created/destroyed as a result of creating/destroying an entry in this table.
NUM juniBridgeIfLowerIfIndex	1.3.6.1.4.1.4874.2.2.63.1.2.1.3	InterfaceIndexOrZero	read-create	The ifIndex of an interface over which this Bridge interface to be layered. A value of zero indicates no layering. An implementation may choose to require that a nonzero value be configured at entry creation.
U32 juniBridgeSPolicyIndex	1.3.6.1.4.1.4874.2.2.63.1.2.1.4	Unsigned32	read-create	The index of the associated subscriber policy.
U32 juniBridgeIfMaxLearnCount	1.3.6.1.4.1.4874.2.2.63.1.2.1.5	Unsigned32	read-create	The maximum number of entries that can be learned on this interface.
juniBridgeAgeLayer	1.3.6.1.4.1.4874.2.2.63.2
juniBridgeAgeTable	1.3.6.1.4.1.4874.2.2.63.2.1		not-accessible	A table that contains information about unicast entries for which the bridge has aging information.
juniBridgeAgeEntry	1.3.6.1.4.1.4874.2.2.63.2.1.1		not-accessible	Information about a specific unicast MAC address for which the bridge has some forwarding and/or filtering information.
MAC juniBridgeMacAddress	1.3.6.1.4.1.4874.2.2.63.2.1.1.1	MacAddress	not-accessible	A unicast MAC address for which the bridge has aging information.
U32 juniBridgeAge	1.3.6.1.4.1.4874.2.2.63.2.1.1.2	Unsigned32	read-only	The age of this entry in the forwarding table.
juniBridgeMiscCounters	1.3.6.1.4.1.4874.2.2.63.3
C32 juniBridgeDupMacCounterEx	1.3.6.1.4.1.4874.2.2.63.3.1	Counter32	read-only	The total number of duplicate mac entries found for this bridge group. A duplicate mac address is considered duplicate if found on more than one interface(port).
juniBridgeConformance	1.3.6.1.4.1.4874.2.2.63.4
juniBridgeCompliances	1.3.6.1.4.1.4874.2.2.63.4.1
juniBridgeCompliance	1.3.6.1.4.1.4874.2.2.63.4.1.1			The compliance statement for entities which implement the Juniper Bridge MIB.
juniBridgeGroups	1.3.6.1.4.1.4874.2.2.63.4.2
juniBridgeGroup	1.3.6.1.4.1.4874.2.2.63.4.2.1			A collection of objects providing management of bridges in a Juniper product.

RFC description

Juniper Networks bridge interface MIB for service-provider routing platforms. Manages bridge interface creation, deletion, and forwarding age configuration.

Start monitoring Juniper E-series edge router (802.1D transparent bridging) 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 Juniper-BRIDGE-MIB