From: John (jgarrison1@austin.rr.com)
Date: Fri Jul 18 2008 - 20:40:22 ART
Something else for me to lookup...thanks:P. I think that a router will strip
the source ip address, but not the mac. Obviously I don't know for sure or I
wouldn't have to look it up. I'm working on something else right now, and I
can't seem to find what I'm looking for so I'll have to put it off till
tommorow
----- Original Message -----
From: huan@huanlan.com
To: Huan Pham ; Joseph Saad ; Cisco certification ; John
Sent: Friday, July 18, 2008 4:52 PM
Subject: Re: Etherchannel load-balance
This is a back to fundamental question. Traffic forwarding between R1
& R2 uses their Fa0/1 MAC as source/destination. They then do IP lookup to
forward further to the final host destinations (using the orignal PC's host
MAC as destination MAC).
--- On Fri, 7/18/08, John <jgarrison1@austin.rr.com> wrote:
From: John <jgarrison1@austin.rr.com>
Subject: Re: Etherchannel load-balance
To: "Huan Pham" <Huan.Pham@peopletelecom.com.au>, "Joseph Saad"
<joseph.samir.saad@gmail.com>, "Cisco certification" <ccielab@groupstudy.com>
Date: Friday, July 18, 2008, 11:01 PM
Huan,If the routers strip the source mac. How does traffic know where to go
in either direction.?-----
Original Message ----- From: "Huan Pham" <Huan.Pham@peopletelecom.com.au>To:
"Joseph Saad" <joseph.samir.saad@gmail.com>; "Ciscocertification"
<ccielab@groupstudy.com>Sent: Thursday, July 17, 2008 6:17 PMSubject: RE:
Etherchannel load-balance> This is an interesting question!>> I do not think
that Joseph's solution answers the question. This is> because:>> For this
particular example, as VLAN A is behind R1, SW2 only sees a> single MAC of
R1--Fa0/1, and not all MAC of PC in VLAN A. Therefore, it> can not
(effectively) do load-balancing based on destination MAC, nor> can it do
load-balancing based on source IP (traffic from server in VLAN> C only have
one single source IP). Note that switches can only influence> (load-balance)
traffic going out, and not traffic coming back.>> Similarly, SW1 can not do
load-balance
based on source MAC, although it> can do load-blance based on source IP.>> So
my solution is:>> SW1: load-balance based on source IP (or source-destination
IP)> SW2: load-balance based on destination IP (or source-destination IP)>>
BTW, Joseph, how do you configure SW1 with both source Mac and Source IP>
(assuming you only have IP traffic)?>> Regards,>>> -----Original Message----->
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of>
Joseph Saad> Sent: Monday, 7 July 2008 2:24 AM> To: Cisco certification>
Subject: Re: Etherchannel load-balance>> in this particular scenario I'd
configure>> SW1 with source Mac (or Source IP or both)> SW2 with destination
Mac (or Source IP or both)>> The simple rule is:> You configure the switch
"sending out the
traffic to theetherchannel"> in a way to suit the destination SW connected
hosts.>> HTH,> Joseph.>> On Fri, Jul 4, 2008 at 7:49 PM, Cisco Addicted>
<cisco.addicted@gmail.com>> wrote:>>> Dears,>>>> I want to know what is to
consider when deciding the ether channel>> load balancing if I may have the
following scenario:>>>>>>>>>>>> VLANA-(Fa0/0--R1--Fa0/1)------ SW1 (3560)===
===SW2 (3560)>> ------(fa0/1-R2----fa0/0) ----- VLAN C>>>>>>>> And
considering there is a many users in VLAN-A accessing server on>> VLAN-C, and
there is etherchannel trunk configured between SW1 &SW2.>>>>>>>> Thanks in
advance.>>>>>>
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