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connecting 2 VLAN's on 2 Switches

Dear All,

I have a 3COM 4200G-48pt and a 3COM 4210G-48pt switch.

The 4200G has two VLANs :

* LAN (32 ports)
* SAN (16 ports)

both with untagged member ports. I assume that basically this is a "port VLAN" where I simply split up the switch. For the computers connected to the switch, it is as if I had 2 seperate switches.

There's no need for any traffic going between the two VLAN's.

Now I want to add the new 4210G to get redundancy.

I made the same configuration on the 4210G, with 2 VLAN's with untagged ports.

There are 2 links between each lan on each switch, so :

- Switch 1 - pt 48 --> Switch 2 - pt 48
- Switch 1 - pt 47 --> Switch 2 - pt 47
- Switch 1 - pt 1 --> Switch 2 - pt 1
- Switch 1 - pt 2 --> Switch 2 - pt 2

for some reason, the system works fine for the "SAN - VLAN" but not for the "LAN - VLAN"...

SO:

1° is this configuration OK?
2° any clues why it doesn't work with LAN-VLAN ?

3° we have 5 desks with 4 workstations each. Currently, each desk has a small 8 pt switch. Is it a good idea to connect those switches to each 3COM switch?

thanks in advance!

Nicolas

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from_exp

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nd2u

ASKER

maybe it's best we forget about the desktop switches for the moment.

As for the inter switch connection... I don't see what's the problem actually...

So your solution is to interconnect via eg 4 ports of each switch and configure those ports as TAGGED members for each VLAN ?

from_exp

and to configure not only tagged for each vlan, but also as a member or link aggregation group, otherwise only one of them will work, but 3 other will be disabled by spanning tree.

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BooSTid

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