What is a non-routable VLAN? Why would you use one?

1545 pts.
Tags:
Networking
Networks
Routing and switching
Virtual LAN
VLAN
VLAN configuration
I've heard the term "non-routable VLAN" but am not sure what exactly it means, why it exists or when it's used. It would seem perhaps just by definition that it's an existing virtual local area network (VLAN) that just doesn't have a VLAN interface created for it anywhere on purpose. Do you use it on switches' host ports or is it used for backbone links? I've also heard it used in reference to guest access. Thanks in advance.

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As the name explains “non-routable VLAN” is a virtual LAN that you cannot route. VLANs are by default Layer 2, restricting the broadcast domain. If you create a VLAN it will be Layer 2 until the time you assign an IP address to it, which makes it routable.

You are right in saying that it’s a VLAN without any IP address assigned to it. The reason for doing this is for security issues. All VLANs which you don’t want to route to should be non-routable.

VLAN hopping is one of the security issues that would make you want to restrict access between VLANs and use non-routable VLANs. Some of my customers have liked the idea of using non-routable VLANs for Internet access/guest users.

Hope this clarifies.

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