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Home > Success Center > Network Performance Monitor (NPM) > VLAN 4095 is displayed in reports

VLAN 4095 is displayed in reports

Table of contents

Updated November 14, 2016


This article explains the condition where VLAN ID 4095 is visible in a report, even though a user has not configured it on their system (it is not visible for example in a Show Config output).


VLAN 4095 and VLAN 0 are both reserved VLANs across many vendor equipment. As a result, it may appear when polling VLAN information from a device.


  • All NPM versions
  • Cisco, Juniper, ESX


It is possible to filter the VLAN to exclude it from a report, whether in Web Reports or Report Writer. It is also possible to exclude the VLAN from the database through SQL.

  1. Go to Node Details > List Resources.
  2. If the VLAN is shown, clear the selection.


Alternative solution

  1. Click Edit on the List of VLANs resource.
  2. If a filter option is available, add a filter where VLAN <> 4095. Otherwise, click Edit and create a Feature request to allow filters in the List of VLANs resource.


Build a SQL report for all VLANs, excluding VLAN 4095 and turn this report into a web resource.


  • Vendors reserve 4095 for VLANs, For example, Cisco reserves VLAN 1 (in addition to VLANs 0 and 4095).
  • VLAN identifier (VID) is a 12-bit field specifying the VLAN to which the frame belongs. The hexadecimal values 0x000 and 0xFFF are reserved.
  • The reserved value 0x000 indicates that the frame does not carry a VLAN ID. In this case, the 802.1Q tag specifies only a priority and is referred to as a priority tag.
  • The ID value 0xFFF is reserved for implementation use. It must not be configured or transmitted. It can be used to indicate a wildcard match in management operations or filtering databse entries.
  • On bridges, VID 0x001 (the default VLAN ID) is often reserved for management VLAN. This is vendor-specific.
  • All other values may be used as VIDs, allowing up to 4,094 VLANs.





Last modified
18:00, 13 Nov 2016