From: Joseph Saad (joseph.samir.saad@gmail.com)
Date: Wed Jan 02 2008 - 17:02:42 ARST
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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