TN-EVC-MIB

MIB Reference — IPNetwork Monitor · Updated September 09, 2026

All MIBsTN-EVC-MIB

Organization: Transition Networks, Inc.

Last Updated: 2014-05-06

Category: Service Management, Transition Networks Media Converters

Description: Manages Transition Networks Ethernet virtual circuit provisioning, attributes, and status.

Start monitoring vendor-neutral, standards-based MIB, any SNMPv3-capable network device (SNMP engine identity/boot/clock status) 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.

What Is TN-EVC-MIB?

TN-EVC-MIB is a Transition Networks private MIB for managing Ethernet Virtual Circuits (EVCs) on the vendor's managed media-converter and switching platforms. It exposes port-level EVC attributes such as tag mode, DEI mode, and address learning, together with EVC-level attributes like VLAN ID (VID), inner VID, and NNI port list, covering both configuration and operational status of provisioned virtual circuits. From a monitoring standpoint it is used to confirm that Carrier Ethernet services are provisioned and operating as expected -- e.g., that the correct VLANs are mapped to the correct NNI ports and that learning/tagging behavior matches the service design -- functioning as a service/software-status MIB rather than exposing hardware environmentals. It builds on IEEE 802.1ad/MEF Ethernet virtual circuit concepts layered onto Transition Networks' device architecture. It is typically deployed in carrier Ethernet access/aggregation networks where Transition Networks media converters or switches terminate EVCs for business services. Network engineers evaluating or troubleshooting this functionality can download the TN-EVC-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in TN-EVC-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

  • Transition Networks managed media converters/switches

Monitoring Examples

An operator can poll tnEvcTable/tnEvcEntry using tnEvcIndex to check tnEvcVid and tnEvcIVid against the expected service VLAN mapping, and inspect tnEvcNNIPortlist to confirm the EVC is bound to the correct network-facing ports. Checking tnEvcPortTable's tnEvcPortTagMode and tnEvcPortDEIMode per port can reveal a misconfigured tagging mode that would cause a customer's traffic to be dropped or misclassified.

What Can Be Monitored

  • EVC VLAN ID / inner VID mapping
  • NNI port list per EVC
  • port tag mode
  • DEI mode
  • address learning mode
Imported Objects

From ENTITY-MIB

entPhysicalIndexOBJECT-TYPE

From IF-MIB

InterfaceIndexOrZero
ifIndexOBJECT-TYPE

From INET-ADDRESS-MIB

InetAddress

From Q-BRIDGE-MIB

PortList
VlanId
VlanIdOrAny
VlanIdOrAnyOrNone
VlanIdOrNone

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter64
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

MacAddress
RowStatus
StorageType
TEXTUAL-CONVENTION
TruthValue

From TRANSITION-SMI

tnProductsOBJECT-IDENTITY

How to Use in IPNetwork Monitor

Example using tnEvcStatGreenFrameRx OID:

Select a Transition Networks managed media converters/switch (Ethernet Virtual Circuit VLAN/tagging config status) 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 tnEvcStatGreenFrameRx 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. The number of green received. 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

RFC description

Ethernet Virtual Circuit (EVC) MIB for transport networks. Manages E-Line, E-LAN, and E-Tree services as defined by Metro Ethernet Forum.

Start monitoring Transition Networks managed media converters/switches (Ethernet Virtual Circuit VLAN/tagging config status) 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 TN-EVC-MIB