CISCO-METRO-PHY-MIB

MIB Reference — IPNetwork Monitor · Updated October 05, 2026

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Organization: Cisco Systems, Inc.

Last Updated: 2005-09-02

Category: Cisco Devices, Network Interfaces, Optical and WDM

Description: Manages Metro Ethernet physical layer interfaces including SONET/SDH and optical parameters on Cisco metro devices.

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What Is CISCO-METRO-PHY-MIB?

CISCO-METRO-PHY-MIB is a Cisco-specific module for Metro Ethernet and DWDM (dense wavelength division multiplexing) optical switching platforms, covering physical-layer interface configuration and protocol-specific error counters. It exposes data in categories such as interface protocol/rate settings, loopback and safety controls, clocking, auto-negotiation, and per-interface physical-layer statistics. It is explicitly useful for monitoring hardware status of optical transport gear — tracking interface operating mode, loopback state, laser safety interlocks (OFC and forward laser control), and error/statistics counters that reveal a degrading or misconfigured optical link before it causes an outage. The MIB is layered on top of standard interface conventions and is meant to be used alongside the ifTable/ifStackTable framework for correlating physical ports to logical interfaces. It is typically deployed on Cisco metro optical/DWDM switches carrying SONET/SDH or Ethernet traffic across metro-area optical networks, and engineers can download the CISCO-METRO-PHY-MIB file to load it into their MIB browser for reference.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-METRO-PHY-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

  • Cisco Metro Ethernet / DWDM optical switches

Monitoring Examples

An operator would poll cmPhyIfTable/cmPhyIfEntry indexed rows to read cmPhyIfMode, cmPhyIfProtocol, and cmPhyIfClockRate for each physical port, and check cmPhyIfMonitor plus cmPhyStatistics counters to detect rising physical-layer errors. Fields like cmPhyIfLoopback, cmPhyIfOFC, cmPhyIfLaserSafetyControl, and cmPhyIfForwardLaserControl let an admin confirm a port hasn't been left in a diagnostic loopback or safety-shutdown state, which would explain an unexpected link-down condition. cmPhyIfAutoNegotiation and cmPhyIfTxBufferSize are useful for diagnosing negotiation mismatches or buffering-related throughput issues on the optical link.

What Can Be Monitored

  • physical interface protocol and rate
  • loopback mode state
  • laser safety and forward laser control status
  • OFC (Open Fibre Control) status
  • auto-negotiation status
  • physical-layer error statistics
Imported Objects

From CISCO-SMI

ciscoExperimentOBJECT-IDENTITY

From IF-MIB

ifIndexOBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Counter64
Integer32
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TEXTUAL-CONVENTION
TruthValue

How to Use in IPNetwork Monitor

Example using cmPhyRxCVRD OID:

Select a Cisco Metro Ethernet / DWDM optical switch 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 cmPhyRxCVRD 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. This object represents the lower word value of the counter associated with the number of code violations and running disparity errors encountered, in the receive direction. 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 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

RFC description

Manages physical layer interface configuration and error statistics for Cisco DWDM optical metro switches.

Start monitoring Cisco Metro Ethernet / DWDM optical switches 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 CISCO-METRO-PHY-MIB