Re: Load balancing

the really short version:

Although officially according to vendors there is no difference in the
purpose, as both distribute traffic. We Agree on that!.
But Technically their operation is different. If traffic is distributed in a
EVEN way it could be regarded as load-balancing, ALL other forms regardless
of the technology will be sharing the traffic load, since it is UNEVEN.

Its minors technicalities, but necessary to understand the difference. Else
you will have a stupid client coming to you and saying, "but these links are
not load-balancing, one has more traffic". yes.....

<ruhann>

On Sun, Jul 19, 2009 at 12:47 AM, Marcus J. Lasarko Sr. <mjlasarko_at_gmail.com
> wrote:

> Trying to boil this down... my interpretation is:
>
> Load Sharing uses any candidate path, not necessarily 'equal' or
> 'switched', directly connected or not, to distribute traffic. I use the term
> Load Sharing as being able to share links over diverse paths, to ANY
> destination - an example may be multi-homed ISP links
>
> Load Balancing will distribute/balance traffic between adjacent peers
> across multiple links, not routing. I interpret Load Balancing as sending
> traffic across multiple paths, to the SAME destination - an example may be a
> bundle or server farm, perhaps
>
> I was (and am still) confused when I see a vendor state that a routing
> protocol will do 'unequal cost load balancing', I think they mean load
> sharing, a load either way? Hearing some vendors speak of these terms they
> do seem interchangeable to me at times. The more I hear the less I
> understand :)
>
> ...As for BGP (or any other routing protocol) my understanding is that they
> do not load balance, they ask the RIB, the RIB can balance or pass the buck.
>
> I thought replying to this might help me understand, but I may be more
> confused than I was prior to this post?
>
> ~M
>
>
>
>
>
>
>
> On Jul 18, 2009, at 5:43 PM, Gary Duncanson wrote:
>
> There is also a subtle difference between load balancing and load sharing
>> so far as BGP is concerned. At least from what I remember from Dr Pete
>> Welcher's papers.
>> ----- Original Message ----- From: "Ruhann" <groupstudy_at_ru.co.za>
>> To: "Pavel Bykov" <slidersv_at_gmail.com>
>> Cc: "jack daniels" <jckdaniels12_at_gmail.com>; "Zaid Alwasity" <
>> zaidalwasity_at_hotmail.com>; "Cisco certification" <ccielab_at_groupstudy.com>
>> Sent: Saturday, July 18, 2009 10:24 PM
>> Subject: Re: Load balancing
>>
>>
>> As Pavel correctly pointed out, there are many ways on this particular
>>> topic
>>> :)
>>>
>>>
>>> On Tue, Jul 7, 2009 at 6:20 PM, Pavel Bykov <slidersv_at_gmail.com> wrote:
>>>
>>> No... I never said that. There are many ways to load balance.
>>>> On CPU, on L3, on routing protocol level, on L4, on L7... No time to
>>>> look
>>>> for all the links right now.
>>>> etherchannel, mac address distribution (like GLBP), hardware cef,
>>>> software
>>>> cef, ace...
>>>>
>>>> On Tue, Jul 7, 2009 at 6:14 PM, jack daniels <jckdaniels12_at_gmail.com>
>>>> wrote:
>>>>
>>>> > Hi,
>>>> >
>>>> > So that means the only way to load share traffic is CEF ?
>>>> > Request you to fwd some links on how this load balancing happens and >
>>>> what
>>>> > all techiniques are available for load balancing.
>>>> >
>>>> > Reagrds
>>>> > J.Daniels
>>>> >
>>>> >
>>>> > On Tue, Jul 7, 2009 at 9:29 PM, Pavel Bykov <slidersv_at_gmail.com>
>>>> wrote:
>>>> >
>>>> >> Pretty much.
>>>> >>
>>>> >> Control Plane:
>>>> >> 1. Routing protocol decides that routes are equal cost (including
>>>> static)
>>>> >> and offers them to the routing table (up to preset limit. Default: 4,
>>>> max:6)
>>>> >> 2. Routing table installs all offered routes up to preset limit
>>>> >>
>>>> >> Data Plane:
>>>> >> 1. CEF FIB is programmed from the routing table, resolves all
>>>> adjacencies
>>>> >> (GLEAN entries for ARP) etc.
>>>> >> 2. Redundant entries are installed with sharing in mind
>>>> >>
>>>> >> Data plane forwards the packets, and it's CEFs task to load balance.
>>>> >> CEF cannot use flow mask in most cases, only source/destination pair
>>>> and
>>>> >> optionally ID (sort of seed).
>>>> >>
>>>> >>
>>>>
>>>> http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_command_reference_chapter09186a0080417d88.html#wp1010171
>>>> >>
>>>> >>
>>>> >>
>>>> >>
>>>> >> On Tue, Jul 7, 2009 at 4:48 PM, jack daniels <jckdaniels12_at_gmail.com
>>>> >wrote:
>>>> >>
>>>> >>> Hi,
>>>> >>>
>>>> >>> Please suggest -
>>>> >>> so routing protocol bring the two routes in routing table for >>>
>>>> processor
>>>> >>> to read and to load balance TRAFFIC we need CEF .... Cef will load
>>>> balance
>>>> >>> traffic per flow and per destination.
>>>> >>>
>>>> >>>
>>>> >>> Regards
>>>> >>>
>>>> >>>
>>>> >>>
>>>> >>> On Tue, Jul 7, 2009 at 1:55 PM, Zaid Alwasity <
>>>> zaidalwasity_at_hotmail.com>wrote:
>>>> >>>
>>>> >>>> Hi all,
>>>> >>>>
>>>> >>>> I think that load sharing means dividing the load manually between
>>>> >>>> multiple
>>>> >>>> device for example ,network 1-5 are served through router A ,and
>>>> network
>>>> >>>> 6-10 are served through router B like HSRP though multiple stand-by
>>>> >>>> group,
>>>> >>>> and for load balancing both devices are actively serving the >>>>
>>>> networks
>>>> >>>> 1-10
>>>> >>>> like GLBP.
>>>> >>>>
>>>> >>>> Regards,
>>>> >>>> Zaid
>>>> >>>>
>>>> >>>>
>>>> >>>> -----Original Message-----
>>>> >>>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On
>>>> Behalf
>>>> Of
>>>> >>>> Pavel Bykov
>>>> >>>> Sent: 07 July 2009 10:59
>>>> >>>> To: jack daniels
>>>> >>>> Cc: Cisco certification
>>>> >>>> Subject: Re: Load balancing
>>>> >>>>
>>>> >>>> for routining, equal cost routes are simultaneously installed in
>>>> >>>> CEF.
>>>> >>>> CEF then load balances to what is predefined. Normally, it's
>>>> SRC/DST
>>>> >>>> pair
>>>> >>>> what makes the hash.
>>>> >>>> ip cef load-sharing
>>>> >>>> command changes the method of balancing.
>>>> >>>>
>>>> >>>> Software platforms (800/1800/2800/3800/7200) also enable you to
>>>> load
>>>> >>>> balance
>>>> >>>> per packet in routnd robin fasion.
>>>> >>>> Then it's per interface command "ip load-sharing per-packet"
>>>> >>>>
>>>> >>>> Load sharing/balancing are similar terms which are not divided
>>>> regarding
>>>> >>>> particular feature.
>>>> >>>> So you can refer to balancing as sharing and sharing to balancing.
>>>> >>>>
>>>> >>>>
>>>> >>>> On Tue, Jul 7, 2009 at 9:47 AM, jack daniels >>>> <
>>>> jckdaniels12_at_gmail.com>
>>>> >>>> wrote:
>>>> >>>>
>>>> >>>> > Dear All,
>>>> >>>> >
>>>> >>>> > I'm very confused on the diffrent ways for load balancing the
>>>> traffic
>>>> >>>> if I
>>>> >>>> > have more than one route in my routing table.
>>>> >>>> >
>>>> >>>> > Also please suggest diffrence between load sharing and load
>>>> balancing
>>>> >>>> >
>>>> >>>> >
>>>> >>>> > Regards
>>>> >>>> > J.Daniels
>>>> >>>> >
>>>> >>>> >
>>>> >>>> > Blogs and organic groups at http://www.ccie.net
>>>> >>>> >
>>>> >>>> >
>>>> >>>>
>>>> _______________________________________________________________________
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>>>> >>>> >
>>>> >>>> >
>>>> >>>> >
>>>> >>>> >
>>>> >>>> >
>>>> >>>> >
>>>> >>>> >
>>>> >>>>
>>>> >>>>
>>>> >>>> --
>>>> >>>> Pavel Bykov
>>>> >>>> ----------------
>>>> >>>> Don't forget to help stopping the braindumps, use of which reduces
>>>> value
>>>> >>>> of
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>>>> >>>>
>>>> >>>>
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>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>
>>>> >>
>>>> >>
>>>> >> --
>>>> >> Pavel Bykov
>>>> >> ----------------
>>>> >> Don't forget to help stopping the braindumps, use of which reduces >>
>>>> value
>>>> >> of your certifications. Sign the petition at
>>>> >> http://www.stopbraindumps.com/
>>>> >>
>>>> >
>>>> >
>>>>
>>>>
>>>> --
>>>> Pavel Bykov
>>>> ----------------
>>>> Don't forget to help stopping the braindumps, use of which reduces value
>>>> of
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>>>> http://www.stopbraindumps.com/
>>>>
>>>>
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>> --
>>> <ruhann>
>>>
>>>
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>>
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>

-- 
<ruhann>
Blogs and organic groups at http://www.ccie.net