failover and load balancing

pat patkumar82 at
Thu Jun 25 17:43:53 UTC 2009


  As per my knowledge failover protocol uses MAC hashing using Pearson
algorithm, for MAC 00:00:00:00:00:01 output of algorithm should be 110(6E)
which is less than your split value (i assume your split is  defalut  128) ,
hence Primary shall respond your DISCOVER with offer.

Experts please confirm if iam wright or wrong.


On Thu, Jun 25, 2009 at 10:32 PM, loganathan Govindaraj
<loganosc at>wrote:

> Hi
>        We are testing failover and load balancing our setup is like this
> Dhcp server primary-------------|
>                                           |
>                                           | -------------------
> Router/Relay agent----------------- DHCP clients
> Dhcp secondry -------------------|
> The router/relay agent is configured to forward the broadcast to both the
> servers.
> When i send a client with a mac-address of 00:00:00:00:00:00:01 the router
> forwards the packet to both primary and secondry.
> On recipt of a discover the i get a offer from the primary server once and
> in another instance the mac address is offered by the secondry .
> I am not able to get how the hashing works. Can any one explain how the
> hasing works
> Another behaviour which i would like to mention here . Some times we get
> offers from both the servers as the discover is reaching the servers .As per
> the protocol after hashing primary or secondry should send an update to the
> peer and then provide an offer .The behaviour is contradicting
> Logan
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