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*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 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 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 > > 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 > > > > > > > _______________________________________________________________________ > > > Subscription information may be found at: > > > http://www.groupstudy.com/list/CCIELab.html > > > > > > > > > > > — > > 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 > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html