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Is there a standard or technical limitation that determines the number of ports/MAC Addresses per VLAN?

Chris Partsenidis EXPERT RESPONSE FROM: Chris Partsenidis

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QUESTION POSED ON: 19 September 2003
Is there a standard or technical limitation that determines the number of ports/MAC Addresses per VLAN? I have heard the number 100 batted around as the standard. Do you know where that number comes from?

I know that certain platforms like the CISCO Catalyst can support up to 1024 VLANs, but cannot find the limit of either static or dynamic users on one VLAN.


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EXPERT RESPONSE
It is certainly true that Cisco switches post a limitation on the number of VLANs someone is able to create. While I am not certain about the maximum amount of VLANs you can create on all the various catalyst switches, I do know that on a Cisco 6000 catalyst, your VLAN id can be within the range 1 to 1005.

On another document I had read a few weeks ago there was a reference to the Catalyst 3000 series, mentioning that it supported a maximum of 64 VLANs.

Since every switch model is not the same, they are likely to have different specifications that restrict the number of active VLANs they can handle.

I am also unaware of what limitation other vendors pose on their VLAN ready switches. A few switches that I had a look at didn't reveal much information, in order to allow me to compare them and come to a logical conclusion.

As for limits on static and dynamic users, this is an issue I had looked into a few months ago but never managed to find the answer.

My best suggestion is to spend a while on Cisco's site and Google. Your bound to come across a site or article that will help you find your answers.


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