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Setting up 2 VLAN's over fibre backbone

Hi,

I've got a question about setting up VLAN's on 3Com switches.

We've got two locations connected with a fibre backbone. (Both locations use the same subnet). On both locations a 3Com 4228G switch is used.

I want to set up a VLAN for a couple of pc's which are broadcasting quite a bit. I'm thinking about creating a VLAN 2 for these pc's and use the 3Com default VLAN 1 for the other clients. However.....what about my fibre backbone. Do I have to configure these fibre ports to be a member of both VLAN's to let both VLAN's communicate over the backbone? How do I do this?

So in short.....both locations use VLAN 1 and VLAN 2, how do I configure the backbone ports?

Regards,

Aico
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Aico
Asked:
Aico
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1 Solution
 
Don JohnstonInstructorCommented:
You will need to setup an 802.1q trunk over the fibre between the two switches. I would recommend creating two VLAN's; one for the PC's that "broadcast quite a bit" and a second for the others. Don't use the default VLAN for user traffic.

The only other thing to watchout for is that 802.1q has a "native" VLAN. It usually defaults to VLAN1. The catch here is that it must be the same on each end of the trunk.

-Don
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AicoAuthor Commented:
Do I only need to configure the fibre ports to use tagging or do I also have to configure all other ports to use tagging?

For example, is it possible to leave all the default ports (normal pc's) in the default VLAN 1 untagged and put the broadcasting pc ports in VLAN 2 untagged and configure all the fibre backbone ports to be a member of both VLAN's tagged?
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Don JohnstonInstructorCommented:
Yes, just the fibre ports need to be configured as tagged (or trunked). The end user ports are set as members of a paticular VLAN.

-Don
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AicoAuthor Commented:
Ok, one final question. I think this applies to all uplink ports ( in case of more then two switches ). Am I right? Do all the uplink ports need to be configured as tagged?
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Don JohnstonInstructorCommented:
Not neccessarily.

If you had another fibre link available between your two switches, you could use one to carry VLAN1 traffic and the other to cary VLAN2 traffic. In that case, you'd have an uplink port that wasn't tagged.

The only ports that need to be configured as tagged are ports that carry multiple VLANs.

-Don
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AicoAuthor Commented:
Great! Thank you for your help! Points well earned, I would say.
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