Re: Load balancing

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
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>> >>>
>> >>
>> >>
>> >> --
>> >> Pavel Bykov
>> >> ----------------
>> >> Don't forget to help stopping the braindumps, use of which reduces
>> >> value
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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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>
>
> --
> <ruhann>
>
>
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Received on Sat Jul 18 2009 - 22:43:24 ART