From: Joseph Saad (joseph.samir.saad@gmail.com)
Date: Wed Jan 02 2008 - 17:04:38 ARST
so, let's assume that I want to use the same path for the traffic back and
forth.
I'd configure the sending switch with dest-mac and other switch with
source-mac (I am taking the simple assumption that the MAC addressess are
simply swapped in the response).
HTH,
Joseph.
On Jan 2, 2008 11:02 PM, Joseph Saad <joseph.samir.saad@gmail.com> wrote:
> What I simply mean is that: load balancing in a specific direction depends
> on the "Sending" switch.
>
> So, let's say you want to load balance the traffic always to be based on
> destination MAC. then, I would ask in which direction?
>
> It's important to draw a quick L2 for such questions.
>
> It is similar to a router load balancing traffic between 2 links ... It
> always depends on the router "sending" the traffic. the other router
> returning the response, could completely use a different path and it never
> depends on how the information was received.
>
> Difficult to test, but I fail to see how a switch configuration can
> control how the traffic is "received" by it.
>
> Joseph.
>
>
> On Jan 2, 2008 10:52 PM, Gary Duncanson < gary.duncanson@googlemail.com>
> wrote:
>
> > Joseph,
> >
> > This is interesting. Do you mean that the reply path is a done deal
> > because
> > the of the source mac used by the inbound frame?
> >
> > Incidently are you saying it needs to be port-channel load-balance
> > dest-mac
> > at both ends? It seems so.
> >
> > Regards
> > Gary
> > ----- Original Message -----
> > From: "Joseph Saad" < joseph.samir.saad@gmail.com>
> > To: "Cisco certification" <ccielab@groupstudy.com>
> > Sent: Wednesday, January 02, 2008 6:09 PM
> > Subject: Re: port-channel load-balance for 3550/3560
> >
> >
> > > Darren, the return traffic will need to have port-channel load-balance
> > > dest-mac also but on the other switch. load balancing is determined by
> > the
> > > "Sending" switch. don't you think?
> > >
> > > On Jan 2, 2008 5:42 PM, Darren Johnson <dazza_johnson@yahoo.co.uk>
> > wrote:
> > >
> > >> To load-balance from source at SW1 to destinations at SW2, you will
> > need
> > >> to
> > >> configure the etherchannel as:
> > >>
> > >> port-channel load-balance dest-mac
> > >>
> > >> Obviously, the return traffic would need the opposite
> > (source-mac)....
> > >>
> > >> Check it out.
> > >>
> > >>
> > >> http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/1
> >
> > >> 2.2_25_see/configuration/guide/swethchl.html#wp1020011
> > >>
> > >> Dazzler
> > >>
> > >> -----Original Message-----
> > >> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > Of
> > >> Frank CCIE
> > >> Sent: 31 December 2007 03:29
> > >> To: shiran guez
> > >> Cc: WorkerBee; Herbert Maosa; mazhar minhas; ccielab@groupstudy.com
> > >> Subject: Re: port-channel load-balance for 3550/3560
> > >>
> > >> Hi, Experts,
> > >>
> > >> If there is only one source at SW1 and many destination at SW2, and
> >
> > >> SW3 is between SW1 and SW2. SW3 is 3550.
> > >>
> > >> How to config load-balance in SW3?
> > >>
> > >> Thanks
> > >>
> > >> Frank
> > >>
> > >> On Dec 30, 2007 1:33 PM, shiran guez < shiranp3@gmail.com> wrote:
> > >> > if there is only one source and one destination yes it doesn't
> > meter
> > >> > but
> > >> if
> > >> > there is one source and many destination it dose meter the
> > direction of
> > >> the
> > >> > load balancing as if there is src-mac method on SW1 and SW1
> > connected
> > >> > to
> > >> SW2
> > >> > and behind SW2 there are many destination, then it doesn't meter
> > all
> > >> traffic
> > >> > will be using one link and not really load balance on the
> > ether-channel
> > >> > bundle but if you set on SW1 dst-mac and the host on SW1 is sending
> > to
> > >> many
> > >> > destinations then there will be load balancing on the
> > ether-channel.
> > >> >
> > >> > so it is important to know the ratio of the traffic source to
> > >> destination,
> > >> > if it is almost the same then you have of the 3560 src-dest-mac.
> > >> >
> > >> > so please Random is your worst enemy as Network Expert!
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> > On Dec 30, 2007 7:38 PM, WorkerBee < ciscobee@gmail.com> wrote:
> > >> >
> > >> > > Does it matters if the algo is different from both ends? It can
> > be
> > >> > > set
> > >> > > differently at
> > >> > > both ends and thins still work because at any one time, the
> > traffic
> > >> > > stream is send
> > >> > > across only 1 link out of x links in that bundle.
> > >> > >
> > >> > > The switch will still receive the packets correctly. Randomness
> > maybe
> > >> the
> > >> > > best
> > >> > > form of load balancing..
> > >> > >
> > >> > > On Dec 30, 2007 10:47 PM, Herbert Maosa <asawilunda@googlemail.com
> > >
> > >> wrote:
> > >> > > > It gets interesting when the port channel is between a 3550 and
> > a
> > >> 3560.
> > >> > > >
> > >> > > > :-)
> > >> > > >
> > >> > > > Herbert.
> > >> > > >
> > >> > > >
> > >> > > > On Dec 30, 2007 1:33 PM, mazhar minhas < mmgnoc@hotmail.co.uk>
> > >> > > > wrote:
> > >> > > >
> > >> > > >
> > >> > > > > hi,
> > >> > > > >
> > >> > > > > EXPERTS,
> > >> > > > >
> > >> > > > > i have one Questions here.
> > >> > > > >
> > >> > > > > i m trying to configure load-balance between port-channels.
> > >> > > > >
> > >> > > > > Found 2 commands, and need to confirm if you guys can help
> > please
> > >> > > > > ======
> > >> > > > > there are 2 differnet commands as for as i know .....
> > >> > > > > according to my knowledge.....
> > >> > > > > here they are
> > >> > > > >
> > >> > > > > port-channel load-balance src.mac (this is for 3550)
> > >> > > > >
> > >> > > > > por-chanel load-balance src-dst-ip (this is for 3560)
> > >> > > > >
> > >> > > > > can some one please confirm this....
> > >> > > > >
> > >> > > > > many thanks.
> > >> > > > >
> > >> > > > >
> > >> > > > >
> > >> > > > >
> > _________________________________________________________________
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> > >> >
> > >> > --
> > >> > Shiran Guez
> > >> > MCSE CCNP NCE1
> > >> > http://cciep3.blogspot.com
> > >> > http://www.linkedin.com/in/cciep3
> > >> >
> > >> >
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