Guidelines

Can you change the native VLAN?

June 13, 2020 by Rhyley Bryan

Can you change the native VLAN?

By default, the native VLAN for a trunk interface on a Cisco IOS device is the default VLAN on Cisco IOS devices – VLAN 1. The default behaviour can be changed by using the command switchport trunk native vlan.

How do I change my default VLAN?

You can not change the default Cisco configurations. You can use the “interface range” to put all ports in a different VLAN in one go. You don’t really need to change the Native VLAN on the uplink trunk, so long as the other switch is using the same Native VLAN.

How do I switch between VLANs?

Three options are available for routing between VLANs:

Use a router, with one router LAN interface connected to the switch for each and every VLAN.
Use one router interface with trunking enabled.
Use a Layer3 switch, a device that performs both the switching and routing operations.

How do I display native VLAN?

Use the show interfaces trunk command to check whether the local and peer native VLANs match. If the native VLAN does not match on both sides, VLAN leaking occurs. Use the show interfaces trunk command to check whether a trunk has been established between switches.

Why would you change the native VLAN?

All VLANs will be tagged. No risk of leaking traffic from access ports to trunk ports unless configured to do so. Dedicated VLAN for management, separated from clients who will not be able to access it. Requires more thought which will lead to a better design than trusting defaults.

What is native VLAN used for?

Conclusion. Finally, we can conclude that the basic purpose of native VLAN is to serve it as a common identifier on opposing ends of a trunk link. To carry untagged traffic which is generated by a computer device attached to a switch port, which is configured with the native VLAN.

What is native VLAN for?

Native VLAN: The native VLAN is the one into which untagged traffic will be put when it’s received on a trunk port. This makes it possible for your VLAN to support legacy devices or devices that don’t tag their traffic like some wireless access points and simply network attached devices.

Why do we need native VLAN?

Can 2 VLANs talk to each other?

Two devices on the same VLAN can communicate even if they have different subnet addresses. If the two are aware of their MAC adresses. You can define the MAC address of a device using ARP command on command line of a PC.

How do I assign an IP address to a VLAN?

Here are the steps to configure an IP address under VLAN 1:

enter the VLAN 1 configuration mode with the interface vlan 1 global configuration command.
assign an IP address with the ip address IP_ADDRESS SUBNET_MASK interface subcommand.
enable the VLAN 1 interface with the no shutdown interface subcommand.

Is native VLAN required?

In order to configure native VLAN, switch port trunk native VLAN command is used. Native VLANs are recognized if they are not tagged to any trunks. It is not necessary to have native VLAN on the trunk.

Is native VLAN necessary?

How to configure native VLAN in Switch port?

Is there only one native VLAN per trunk?

There is only one native VLAN per trunk and this must match on both the ends of the trunk which are responsible for all the traffic which is untagged.

What happens if I change the VLAN of BPDUs?

Traffic such as BPDUs, PagP, CDP, use the native VLAN that is vlan 1.But if you change the native vlan then CDP/VTP/PagP will still use vlan 1 but the packets will be tagged.Only DTP uses the native vlan so if you changed the native vlan then DTP would use the new vlan to send frames.With PVST+ BPDUs obviously run on all vlans. Hope to Help !!

Which is a good security practice for VLANs?

A good security practice is to separate management and user data traffic. The management VLAN, which is VLAN 1 by default, should be changed to a separate, distinct VLAN. A recommended security practice is to change the native VLAN to a different VLAN than VLAN 1. The native VLAN should also be distinct from all user VLANs.