Re: Load balancing

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
>>> >
>>> >
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>>>
>>>
>>> --
>>> Pavel Bykov
>>> ----------------
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>>>
>>>
>>>
>>>
>>>
>>>
>>
>
>
> --
> Pavel Bykov
> ----------------
> Don't forget to help stopping the braindumps, use of which reduces value of
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Received on Tue Jul 07 2009 - 21:44:06 ART