From: ccie2be (ccie2be@nyc.rr.com)
Date: Sun Nov 02 2003 - 02:26:00 GMT-3
L3 EtherChannel - Imagine a serial link with a huge amount of bandwidth, say
200, 400, or 800 mb. And, just like any normal serial interface on a
router, an EtherChannel also has an ip address assigned to it. As you
probably already know, an EtherChannel (L2 or L3) bundles multiple physical
links into a single logical link.
L2 EtherChannel - This is typically used as a trunk between 2 switches and
since trunks typically carry traffic from all vlans, a L2 EtherChannel
provides a means of increasing the bandwidth between 2 devices.
Here's another way to think of it. What's the difference between a normal
router interface and a normal switch port? A router sends packets to a
router interface based on L3 info ( the network address of the link
connected to that interface). A switch, on the other hand, sends frames to
a switch port based on L2 info ( Mac addresses).
An EtherChannel (L2 or L3) behaves the same way as the underlying ports or
interfaces would but just allows a greater amount of bandwidth because
multiple ports or interfaces are being grouped together to increase the
bandwidth.
dt
----- Original Message -----
From: "Shafi, Shahid" <sshafi@qualcomm.com>
To: <ccielab@groupstudy.com>
Sent: Saturday, November 01, 2003 7:40 PM
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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