Why is it recommended that you do not use VLAN 1?

Why is it recommended that you do not use VLAN 1?

As a consequence, VLAN 1 may unwisely span the entire network if not appropriately pruned. If its scope is large enough, the risk of compromise can increase significantly.

Why we need a management VLAN in a network and why using VLAN as management VLAN is unsecure?

The primary benefit of using a management VLAN is improved network security. When all management traffic is on a separate VLAN, it is much harder for unauthorized users to make changes to your network or monitor network traffic. By default, all ports are members of the default VLAN.

What is the purpose of VLAN 1?

VLAN 1 contains control plane traffic and can contain user traffic. It is recommended that user traffic be configured on VLANs other than VLAN 1, primarily to prevent unnecessary user broadcast and multicast traffic from being processed by the Network Management Processor (NMP) of the supervisor.

Is VLAN 1 always untagged?

As VLAN 1 is the default native VLAN, it is used for untagged traffic. If you need to pass frames tagged VLAN 1, you will not be able to, by default. The solution is to change the default VLAN to another value. Once this is done, VLAN 1 can be passed across the trunk just the same as any other VLAN.

Do you need to configure VLAN 1 for Cisco?

Cisco recommends not to use VLAN 1 and not to use any VLAN that carries user data traffic as Management VLAN. You must configure IP address and default gateway for Management VLAN.

Which is VLAN does Cisco use for VLAN Trunking?

Lastly, most security best practices is to use a different VLAN other than 1, because by default, Cisco uses Vlan1 at LAYER2 for VTP (VLAN Trunking Protocol) management as the “NATIVE VLAN”, hence the name, management VLAN. That may be where some confusion comes in with the name “management”.

What is management VLAN and how to configure manager VLAN?

Management VLAN is used for managing the switch from a remote location by using protocols such as telnet, SSH, SNMP, syslog etc. Normally the Management VLAN is VLAN 1, but you can use any VLAN as a management VLAN. Cisco recommends not to use VLAN 1 and not to use any VLAN that carries user data traffic as Management VLAN.

How to not use VLAN 1 for inband management?

Not use VLAN 1 for inband management traffic and pick a different, specially dedicated VLAN that keeps management traffic separate from user data and protocol traffic. Prune VLAN 1 from all the trunks and from all the access ports that don’t require it (including not connected and shutdown ports).