Re: FW: Switching question

Hello CCIE CCIE,

With a name like this, you must get two CCIEs.

If using VLAN IDs other than the default vlan 1, how will each switch know
to maintain the vlan id; via frame tagging? Trunks are needed if you have
multiple vlans and want these to span your network. If you want vlan 10 to
span between the switches, then you need to enable trunking so that the VLAN
ID is maintained.

Another solution is to add a vlan to SW2 and configure a dot1q tunnel
between the ports that SW1 and SW3 connect to. Be sure to enable control
packets via the l2tunnel command so that SW1 and SW3 think they are directly
connected and or can trunk to each other. Another option using this method,
is that you could configure the egress port of each SW1 and SW3 with the
correct vlan id, so they are on the same network; vlan 10.

In this way, you are hiding SW2 from them, and they think they are directly
connected. ;-)

HTH,

Andrew Lee Lissitz

On Thu, Oct 22, 2009 at 8:37 PM, CCIE CCIE <get_ccie_at_hotmail.com> wrote:

> Hi group,
>
> i have 3 switches
>
> SW1---SW2---SW3
>
> trunks are in between, ONLY SW1&3 has the VLAN 10
>
> now if i have 2 clients in vlan 10, one on SW1 and the other on SW3 wants
> to
> communicate, can they do it without creating vlan 10 on SW2 ??
>
> the first thought was yes, but it seems that it will not work, so any
> explanation ??
> i thought that this traffic will be carried through the trunk int, passing
> SW2, even if vlan 10 was not created on it
>
>
> Regards
>
>
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-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net