Shorter mclt times?

[Nicholas F Miller]

I went back and re-read Mani's response and think I may have been  
missing something. Does the MCLT become the default lease time for all  
new leases when they are in partner-interrupted and/or partner-down? I  
could see how you would get a much higher load if your lease times  
dropped from an hour to five minutes. Of course this would only be an  
issue if you were getting a lot of new machines on the network vs  
machines renewing a lease. Those leases should keep the lease times  
they originally had.
_________________________________________________________
Nicholas Miller, ITS, University of Colorado at Boulder



On Jul 15, 2009, at 12:07 PM, Simon Hobson wrote:

> Nicholas F Miller wrote:
>> I'm not trying to be obtuse, but...
>>
>> ...we currently have two dedicated DHCP servers (one is a hot  
>> spare) that are barley taxed. I am at a loss to understand why a  
>> short MCLT would cause us any trouble. Our current DHCP server can/ 
>> could handle a large number of clients that may start their leases  
>> around the same time. Why would failover, with a failover partner  
>> as powerful as the primary server, have a problem with a short MCLT?
>
> It's not a case of "it will", people are just pointing out that if  
> your servers are reasonably well loaded and you increase the load,  
> then you could have problems. Also, there is a difference in load  
> between handling a request-ack handshake to renew a lease, and  
> handling a discover-offer-request-ack (sometimes abbreviated to  
> DORA) handshake to deal with a client that's lost it's lease from  
> the dead partner.
>
> The same is true of normal lease time settings - shorter leases  
> increase the load on the servers.
>
> Since you are certain that you have a modest load, it's not going to  
> be a problem for you.
>
> -- 
> Simon Hobson
>
> Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
> author Gladys Hobson. Novels - poetry - short stories - ideal as
> Christmas stocking fillers. Some available as e-books.
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