RC-MLT-MIB

MIB Reference — IPNetwork Monitor · Updated September 14, 2026

All MIBsRC-MLT-MIB

Organization: Bay Networks, Rapid-City Group

Last Updated: 2010-10-20

Category: Link Aggregation, Nortel Enterprise Data

Description: Manages Multi-Link Trunking (MLT) group configuration and member port status on Bay Networks Rapid-City series switches.

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What Is RC-MLT-MIB?

RC-MLT-MIB is a Bay Networks/Nortel Accelar enterprise MIB for managing Multi-Link Trunking (MLT), Nortel's link-aggregation technology, on Rapid-City series switches. It exposes per-MLT-group extended interface statistics, unicast, multicast, and broadcast packet counters plus high-capacity octet/packet counters, alongside multicast traffic distribution and notification configuration objects. This supports traffic/performance monitoring of aggregated links: an administrator can see whether traffic is balanced across member ports and detect abnormal packet-type distributions that might indicate a failing link or loop. It extends standard IF-MIB-style high-capacity counters with MLT-group-specific extensions in the vendor's Rapid-City tree. It is deployed on Bay Networks/Nortel Accelar/Rapid-City switches wherever multiple physical links are trunked together for bandwidth and redundancy, and the RC-MLT-MIB MIB is what NMS platforms poll to track that trunked-link performance.

IPNetwork Monitor allows you to monitor SNMP objects defined in RC-MLT-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

  • Bay Networks/Nortel Accelar (Rapid-City) routing switch

Monitoring Examples

An operator polls rcStatMltIfExtnTable/rcStatMltIfExtnEntry keyed by rcStatMltIfExtnMltId to compare rcStatMltIfExtnIfHCInOctets/rcStatMltIfExtnIfHCOutOctets against rcStatMltIfExtnIfInBroadcastPkts/rcStatMltIfExtnIfOutBroadcastPkts, watching for broadcast storms on a trunked group. rcMltMcastDistribution is checked to confirm multicast traffic is being load-shared as expected across MLT member links, and rcMltNotificationObjects govern which trunk state-change traps (e.g., member port up/down) are sent to the NMS.

What Can Be Monitored

  • MLT unicast/multicast/broadcast packet counts
  • high-capacity in/out octets per trunk
  • multicast traffic distribution
  • trunk state-change notifications
Imported Objects

From IF-MIB

InterfaceIndex
InterfaceIndexOrZero

From RAPID-CITY

EnableValue
IdList
PortSet
rcL2RedundancyOBJECT-IDENTITY
rcLinkFlapDetectOBJECT-IDENTITY
rcMltOBJECT-IDENTITY
rcStatOBJECT-IDENTITY

From SNMPv2-SMI

Counter32
Counter64
Gauge32
Integer32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE
TimeTicks

From SNMPv2-TC

DisplayString
MacAddress
RowStatus
TruthValue

How to Use in IPNetwork Monitor

Example using rcStatMltIfExtnIfInMulticastPkts OID:

Select a Bay Networks/Nortel Accelar (Rapid-City) routing switch (Multi-Link Trunking traffic statistics) 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 rcStatMltIfExtnIfInMulticastPkts 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 multi-pkts to upper. 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

RFC description

Multi-Link Trunking (MLT) aggregation management for Nortel/Bay Networks, supporting link bundling, load distribution, and redundancy.

Start monitoring Bay Networks/Nortel Accelar (Rapid-City) routing switch (Multi-Link Trunking traffic statistics) 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 RC-MLT-MIB