Vlan

Answered Question
Jul 8th, 2010

Hi experts  I am using a 3750 switch I want to configure 3 vlans on it , but I want to make sure that all ports in the switch will be available for all the vlans.. and I have three different Ip range for three vlans. I appreciate some could help with  it.

I have this problem too.
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Correct Answer by ccarring about 6 years 4 months ago

Hi Biju,

This sounds like a contradiction of basic VLAN design. In fact, it sounds like you are wanting to simply bridge everything together. It will be an extremely inefficient use of the media, as the broadcasts for all three networks will eat up bandwidth that the VLAN is designed to separate one from another.

Here's a link to a doc about VLAN design that might help:

http://www.cisco.com/en/US/docs/internetworking/design/guide/nd2012.html#wp3377

Seems like you'd want to make the three separate VLANs, create a routed interface on each, and let the VLAN interfaces route between them.

What is the requirement for all ports on the switch to have access to all VLANs?

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Correct Answer
ccarring Thu, 07/15/2010 - 10:40

Hi Biju,

This sounds like a contradiction of basic VLAN design. In fact, it sounds like you are wanting to simply bridge everything together. It will be an extremely inefficient use of the media, as the broadcasts for all three networks will eat up bandwidth that the VLAN is designed to separate one from another.

Here's a link to a doc about VLAN design that might help:

http://www.cisco.com/en/US/docs/internetworking/design/guide/nd2012.html#wp3377

Seems like you'd want to make the three separate VLANs, create a routed interface on each, and let the VLAN interfaces route between them.

What is the requirement for all ports on the switch to have access to all VLANs?

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