From: Mike Williams (ccie2be@swbell.net)
Date: Sun Nov 02 2003 - 11:26:03 GMT-3
If I'm not mistaken, you can use the source IP and dest IP addresses to
determine which link in a L2 etherchannel that traffic will take. So
even if you have a L2 etherchanenl between 2 routers, the traffic can
balance over the links (in proportion to the distribution of the
source/dest addresses).
Mike W.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Ryan Cheng
Sent: Sunday, November 02, 2003 1:25 AM
To: Shafi, Shahid; ccielab@groupstudy.com
Subject: Re: Dumb Question but will ask
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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