Re: Load balancing

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
>> ----------------
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>>
>

-- 
Pavel Bykov
----------------
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