TN-NAS-MIB

MIB Reference — IPNetwork Monitor · Updated October 06, 2026

All MIBs › TN-NAS-MIB

Organization: Transition Networks, Inc.

Last Updated: 2012-04-05

Category: Network Access and Authentication, Transition Networks Media Converters

Description: Manages Transition Networks network access server authentication configuration and session state.

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-NAS-MIB?

TN-NAS-MIB is a Transition Networks proprietary SNMP MIB implementing Network Access Server functionality per IEEE 802.1X, controlling port-based authentication of connected devices via RADIUS, including re-authentication timers, guest VLAN assignment, and EAPOL protocol timeouts. It exposes global 802.1X system parameters (re-auth enable/period, EAPOL timeout, aging/hold times) and RADIUS-assigned QoS/VLAN enablement flags, plus a per-port configuration table. It is used to monitor the software status of network access control: whether re-authentication is enabled and its period, whether guest VLAN fallback is active for unauthenticated devices, and hold time before a failed client can retry, critical for diagnosing why a client is stuck unauthenticated or misplaced in the guest VLAN. It depends on RADIUS as an external AAA standard for actual credential validation, referenced via the RADIUS-assigned QoS/VLAN enable objects. It is deployed on Transition Networks managed switches at the network edge, where TN-NAS-MIB SNMP monitoring helps operators enforce and verify 802.1X port security.

IPNetwork Monitor allows you to monitor SNMP objects defined in TN-NAS-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 switch with 802.1X port authentication

Monitoring Examples

An operator polls tnNASSysReAuthEnabled and tnNASSysReAuthPeriod to confirm periodic re-authentication is active and its interval, and checks tnNASSysGuestVlanEnable/tnNASSysGuestVlanId to verify unauthenticated clients land in the correct guest VLAN. tnNASSysEAPOLTimeout and tnNASSysHoldTime are reviewed when a client repeatedly fails to authenticate, since an overly short timeout can cause spurious authentication failures. tnNASPortCfgTable is checked per-port to confirm 802.1X is enabled only on the intended access ports.

What Can Be Monitored

  • re-authentication enable/period
  • EAPOL timeout
  • guest VLAN enablement/ID
  • RADIUS-assigned QoS/VLAN enablement
  • per-port 802.1X configuration
Imported Objects

From Q-BRIDGE-MIB

VlanId

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Gauge32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
TimeTicks
Unsigned32

From SNMPv2-TC

DisplayString
MacAddress
RowStatus
TruthValue

From TRANSITION-SMI

tnProductsOBJECT-IDENTITY

How to Use in IPNetwork Monitor

Example using tnNASRxAccessChallenges OID:

Select a Transition Networks managed switch with 802.1X port authentication (re-auth/guest-VLAN 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 tnNASRxAccessChallenges 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 802.1X-based: Counts the number of times that the switch receives the first request from the backend server following the first response from the supplicant. 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 Gauge32-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

Manages network access server functionality including port-based and MAC-based authentication on Transition Networks equipment.

Start monitoring Transition Networks managed switch with 802.1X port authentication (re-auth/guest-VLAN 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-NAS-MIB