From: dara tomar (wish2ie@gmail.com)
Date: Tue Feb 26 2008 - 16:41:24 ARST
*The switching method is only when CEF is turned on which is by default and
is the recommended settings.
Per packet load-balancing considering the prefixes in the RIB via the paths.
Regards,
Dara*
On Wed, Feb 27, 2008 at 12:01 AM, Joseph Brunner <joe@affirmedsystems.com>
wrote:
> And then only with cef turned off or running per-packet mode Dara
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> dara
> tomar
> Sent: Tuesday, February 26, 2008 1:12 PM
> To: shiran guez
> Cc: Sadiq Yakasai; Rik Guyler; Cisco certification
> Subject: Re: outbound load-balancing
>
> *I agree cent percent with Shiran.
>
> Only Eigrp as a routing protocol gives us load-sharing ability based on
> metrics difference.
>
>
> The Switching function is responsible for doing the load-balancing based
> on
> the IP-RIB entries.
> The routing table only shows us the number of paths towards the
> destination
> as per RIB.
>
> But in reality the the switching function makes it happen or not.
>
> For every CEF entry (IP route) where there are multiple paths to the
> destination, the router creates a 16-row hash table, populating the
> entries
> with pointers to individual paths.
>
> The hash table can be inspected with the show ip cef prefix internal
> command.
>
> Execute this command and see how the 16 buckets are distributed.
>
> Ex:
> Command: **show ip cef prefix internal
>
> **1>While distributing on two links this is equal-cost balancing on two
> links:
>
> Load distribution: 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 (refcount 1)
>
> 2>While distributing on three links this is equal-cost balancing on three
> links:[only 15 used and one left]
>
> Load distribution: 0 1 2 0 1 2 0 1 2 0 1 2 0 1 2 (refcount 1)
>
> Regards,
> Dara*
>
> On Tue, Feb 26, 2008 at 11:27 PM, shiran guez <shiranp3@gmail.com> wrote:
>
> > this is equal cost load sharing, you can see that the load share is
> equal
> > 1
> > to each one of the routes, also the load balancing is not a routing
> > feature
> > but a the switching method
> >
> > you can select either per-destination or per-packet, the unequal load
> > sharing can be done only with EIGRP when using Cisco router. the unequal
> > load share mean that you will be able to send for example: for 10 packet
> > going out you will be able to send 2 packet with one route and 8 packet
> > with
> > another route.
> >
> > the router do not support unequal load balancing using static routes!
> >
> > On Tue, Feb 26, 2008 at 7:45 PM, Sadiq Yakasai <sadiqtanko@gmail.com>
> > wrote:
> >
> > > Hi Rik,
> > >
> > > You can actually do unequal cost load-balancing on the outbound using
> > > static routes. Have a look at this (R1 and R3 are dual hommed to each
> > > other):
> > >
> > > 192.168.1.0/24
> > > R1 (.1) ---------------------------------------------- (.3) R3
> > > ----------------------------------------------
> > > 162.1.13.0/24
> > >
> > > R1#sh run | i ip route
> > > ip route 0.0.0.0 0.0.0.0 192.168.1.3
> > > ip route 0.0.0.0 0.0.0.0 162.1.13.3
> > > ip route 0.0.0.0 0.0.0.0 10.10.10.1
> > > ip route 0.0.0.0 0.0.0.0 10.10.10.3
> > > ip route 0.0.0.0 0.0.0.0 10.10.10.4
> > > ip route 10.10.10.1 255.255.255.255 192.168.1.3
> > > ip route 10.10.10.2 255.255.255.255 192.168.1.3
> > > ip route 10.10.10.3 255.255.255.255 192.168.1.3
> > > ip route 10.10.10.4 255.255.255.255 192.168.1.3
> > > R1#sh ip route 0.0.0.0
> > > Routing entry for 0.0.0.0/0, supernet
> > > Known via "static", distance 1, metric 0, candidate default path
> > > Routing Descriptor Blocks:
> > > * 192.168.1.3
> > > Route metric is 0, traffic share count is 1
> > > 162.1.13.3
> > > Route metric is 0, traffic share count is 1
> > > 10.10.10.4
> > > Route metric is 0, traffic share count is 1
> > > 10.10.10.3
> > > Route metric is 0, traffic share count is 1
> > > 10.10.10.1
> > > Route metric is 0, traffic share count is 1
> > >
> > > A nice trick there!
> > >
> > > Sadiq
> > >
> > >
> _______________________________________________________________________
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> > >
> >
> >
> >
> > --
> > Shiran Guez
> > MCSE CCNP NCE1
> > http://cciep3.blogspot.com
> > http://www.linkedin.com/in/cciep3
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
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