From: Clay K Auch (clauch) (clauch@cisco.com)
Date: Sun Dec 02 2007 - 06:36:31 ART
The docs are a wonderful thing <grin>. The text below is straight out of the config guide for 3550s.
==============================================================
Command: port-channel load-balance <method>
Configure an EtherChannel load-balancing method value:
*src-mac-Load distribution using the source-MAC address.
*dst-mac-Load distribution using the destination-MAC address.
The default is src-mac.
When src-mac is used, load distribution based on the source and destination IP address is also enabled. For all IP traffic being routed, the switch chooses a port for transmission based on the source and destination IP address. Packets between two IP hosts always use the same port for packet transmission, but packets between any other pair of hosts might use a different transmission port.
=============================================================
Here is the link as well ...
Enjoy!
Clay
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Calil Zorby
Sent: Thursday, November 29, 2007 4:09 PM
To: Calil Zorby; Joseph Saad
Cc: ccielab@groupstudy.com
Subject: Re: Basics- Etherchannel load-balancing
Anybody has any idea about this?
thanks
----- Original Message -----
From: "Calil Zorby"
To: "Joseph Saad"
Subject: Re: Basics- Etherchannel load-balancing
Date: Wed, 28 Nov 2007 15:09:12 -0500
Hi, Joseph!
If not, what the diference between the load balance using "src-mac"
and
"src IP" ? When each method will be used?
thanks
----- Original Message -----
From: "Joseph Saad"
To: "Calil Zorby"
Subject: Re: Basics- Etherchannel load-balancing
Date: Wed, 28 Nov 2007 22:43:21 +0400
I tend to agree except to the part where the port of choice is based
on the source IP address while routing.
On Nov 28, 2007 8:20 AM, Calil Zorby wrote:
Alex,
"...for all IP traffic being routed..." the SW "...chooses a port
for
transmission based on the source and destination IP
address..."
But, for traffic being switched, it will use the src-mac, by
default.
Anyone correct me if I am wrong.
thanks
-----Original Message-----
From: Alex Steer [mailto:alex.steer@xxxxxxxxxxx]
Sent: Sunday, November 04, 2007 4:58 AM
To: Joseph Brunner; Radioactive Frog; Rich Collins
Cc: Roman Rodichev; groupstudy
Subject: RE: Basics- Etherchannel load-balancing
That's very interesting.
It's also very misleading. Why call it src-mac if its actually
src-mac-src-dst-ip. I wonder if the proctors are aware of that?
I
think I wouldn't trust that just in case the person marking my
exam
isn't aware (no ones perfect, apart from me).
-----Original Message-----
From: nobody@xxxxxxxxxxxxxx [mailto: nobody@xxxxxxxxxxxxxx] On
Behalf Of
Joseph Brunner
Sent: 04 November 2007 06:13
To: 'Radioactive Frog'; 'Rich Collins'
Cc: 'Roman Rodichev'; 'groupstudy'
Subject: RE: Basics- Etherchannel load-balancing
The 3550's and 3560 share dst-mac & src-mac, while the 3560 add's
more
options...
rack1sw1(config)#port-channel load-balance ? (3560)
dst-ip Dst IP Addr
dst-mac Dst Mac Addr
src-dst-ip Src XOR Dst IP Addr
src-dst-mac Src XOR Dst Mac Addr
src-ip Src IP Addr
src-mac Src Mac Addr
rack1sw2(config)#port-channel load-balance ? (3550)
dst-mac Dst Mac Addr
src-mac Src Mac Addr
both default to src-mac
3550 default settings
per the doc cd if you leave the 3550 on default src-mac it also
load
balances based on ipv4 destination ip address... and I quote...
"When src-mac is used, load distribution based on the source and
destination
IP address is also enabled. For all IP traffic being routed, the
switch
chooses a port for transmission based on the source and
destination IP
address. Packets between two IP hosts always use the same port
for
packet
transmission, but packets between any other pair of hosts might
use a
different transmission port."
3560 default settings
I have not had a chance to capture traffic from my 3560's
incoming port
channel physical member interfaces separately yet to see if they
also
load
balance based on source and destination ip address with default
src-mac
load
balancing, like the 3550's but with the other modes I doubt it.
-Joe
-----Original Message-----
From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx ] On
Behalf Of
Radioactive Frog
Sent: Saturday, November 03, 2007 11:55 PM
To: Rich Collins
Cc: Roman Rodichev; groupstudy
Subject: Re: Basics- Etherchannel load-balancing
How about mixing 3550's and 3560's on each side?
-----------------------------------------------------------
The basic theory of etherchannel:
there are 2 protocol standard in etherchannel - PAgP and LACP.
PAGP is cisco properietary , therefore if you configure switch to
use
PAgP,
both switch must be Cisco make. No matter what model i.e. 3550 or
3660
or
65xx. All works okay.
LACP is a Ieee802.3ad standard. Therefore any make any
vendor/module
doesn't
matter.
So you can plugin one end Cisco switch and other end Cisco.
Cisco----4port trunk--------HP-sw
I have personally tested it and it is working in production
environment.
a good reading:
http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configur
atio
n_example09186a00806cb982.shtml
HTH
frog
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