From: Ryan Cheng (ryanck@i-cable.com)
Date: Sun Nov 02 2003 - 04:24:42 GMT-3
Hi Shahid,
Etherchannel is to make 2 or many physical links to be a logical link, but
the question comes, how to load-share the traffic into each link?
L2 Ethernet: it makes use of the L2 information (e.g. Ethernet DA and SA) as
a matching criteria, says any traffic which has a different DA and SA in the
ethernet header will be flowed into different physical link
L3 Ethernet: in contrast, the L3 information (e.g. destination and source IP
address) is used in this case
If you are using a L2 ethernet channel between Routers, the load-sharing
won't work since all traffic between the routers have a fixed Ethernet DA
and SA.
Hope my reply is useful.
Regards,
Ryan
----- Original Message -----
From: "Shafi, Shahid" <sshafi@qualcomm.com>
To: <ccielab@groupstudy.com>
Sent: Sunday, November 02, 2003 8:40 AM
Subject: Dumb Question but will ask
> Hi Guys,
>
> A stupid one but I'll ask though I think I know the answer: What is the
> difference between layer2 and layer 3 etherchannel? What wont work if I
> use Layer 3 Etherchannel between switches? VTP?? What is more efficient
> and why?
>
> Any input is great!
>
> thanks
>
> Shahid
>
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