From: Erick B. (erickbe@yahoo.com)
Date: Fri Feb 14 2003 - 22:52:55 GMT-3
Hi,
I haven't used this yet in real-world, but cisco has
one example of it being used with service providers /
carrier networks (metro, all ethernet attached w/gear
that supports dot1q tunneling).
For example:
ACME inc is the customer connecting to some provider
via gigabit ethernet. ACME inc happens to have another
location in reach of connecting to the providers
network via Ethernet as well.
ACME inc has VLANs 10, 20, and 30 they want to use at
both sites. Without tunneling, they would need to get
provider to agree to pass all these VLANs and hope
they don't interfere with other customers of theirs.
With tunneling, it takes all these VLANs of ACME inc
and trunks them inside another dot1q trunk with a
single VLAN # that the provider would assign. They
would pass through providers network as this VLAN only
and on egress the providers VLAN would be removed and
ACME inc's VLANs trunked into the other ACME as VLANS
10, 20, and 30.
Right now, newer 3550 and 6500 code support this. I
don't know of any other vendors off hand. I'd imagine
newer extreme, foundry, nortel code do this but not
sure.
--- CCIE FUN <ccieexam2002@yahoo.com> wrote:
> Hello All
> Can anybody please explain me the 802.1Q tunneling
> technology on the Catalyst 3550.
> What are its applications?
> Where it should be used?
>
> I am kind of new the 3550 switch features and have
> never dealt with this tunneling technology.
>
> any info or a brief explanation would be good.
>
> thanks
>
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