COM21-HCXVLAN-MIB

MIB Reference — IPNetwork Monitor · Updated September 14, 2026

All MIBsCOM21-HCXVLAN-MIB

Organization: Com21, Inc.

Last Updated: 1997-01-08

Category: DOCSIS and Cable, VLAN and Bridging

Description: Manages VLAN segmentation and subscriber traffic separation on COM21 HCX cable systems.

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What Is COM21-HCXVLAN-MIB?

This is the Com21 ComController VLAN MIB, part of the HCX product family, used to configure and manage VLAN-based subscriber traffic segmentation on COM21's hybrid fiber-coax cable access equipment. It exposes VLAN assignment, tagging, and traffic-separation configuration objects for subscriber and service traffic carried over the ComController chassis. From a monitoring standpoint it is used mainly to check the configuration/operational status of VLAN segmentation on the device - e.g., whether a subscriber's VLAN mapping is correctly applied - though it may also expose card status tied to VLAN processing. It is one of several COM21 ComController MIBs (alongside HCXRX and HCXTOP) that together cover the full chassis, and likely depends on general chassis/interface conventions shared across that family. It would be deployed by cable operators needing to monitor and audit subscriber traffic segregation on their HFC access network. Engineers can download the COM21-HCXVLAN-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in COM21-HCXVLAN-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

  • COM21 ComController headend unit
  • cable/HFC broadband access equipment

Monitoring Examples

No sample object names were provided for this MIB. Based on its stated purpose, it would likely expose per-subscriber or per-port VLAN assignment tables that an operator would check to confirm traffic separation is correctly configured, or to spot a misapplied VLAN causing subscriber traffic leakage. This is inferred from the module's stated purpose rather than confirmed object names.

What Can Be Monitored

  • VLAN assignment/tagging configuration
  • subscriber traffic segmentation status
Imported Objects

From COM21-HCX-MIB

com21OBJECT-IDENTITY
com21HcxOBJECT-IDENTITY

From COM21-HCXALM-MIB

hcxAlmSeverityOBJECT-TYPE
hcxEventLogTimeOBJECT-TYPE

From SNMPv2-SMI

Gauge32
Integer32
IpAddress
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
TimeTicks

From SNMPv2-TC

DisplayString
MacAddress

How to Use in IPNetwork Monitor

Example using hcxVlanCurrMcastTxPkts OID:

Select a Com21 ComController HCX VLAN management (legacy) 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 hcxVlanCurrMcastTxPkts 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 contains the number of Multicast net packets sent downstream over the Vlan in the current 15min period. 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 VLAN configuration and statistics on Com21 HCX ComController devices.

Start monitoring Com21 ComController HCX VLAN management (legacy) 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 COM21-HCXVLAN-MIB