Messages

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Mitel MiVoice Business/MCD/3300 / Re: DHCP Configuration on Redundant Controllers

« on: June 09, 2011, 06:34:03 AM »

Our needs are for about 200 phones/users per building floor with maximum potential growth to 220.  We have assigned /24 subnets per floor which should be enough if it wasn't for the backup requirement.    It sounds like with the secondary DHCP server we will need a /23 and assign the lower /24 pool to the primary and the higher /24 to the secondary.  This also implies changes to the network gateway interface IP address mask and assumes contiguous IP subnet space is available.  Is this correct?

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Mitel MiVoice Business/MCD/3300 / Re: DHCP Configuration on Redundant Controllers

« on: June 08, 2011, 10:55:54 AM »

Thank you all for the replies.  I think some of the people misunderstood my question.  The two controllers are not on the same network, they are not even in the same geographic region.  They just happen to hand out the same IP space to IP phones, one being the primary and the other a secondary DHCP server which kicks in if and only if the primary fails.  The two IP DHCP pools must be the same size so that they can accommodate all users in a call center.  Also these pools have to match the IP addressing of the network interface, which cannot be changed (part of a longer conversation).  Also, the way a DHCP server knows which IP addresses have been assigned by the another DHCP server is via the DHCP mechanism of broadcasting requests and responses.  This is where my question comes in.  The closest answer was from user Mitel100 who recommended we split the space 80/20.  My question again is can we do this with the exact same IP ranges, why or why not?

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Mitel MiVoice Business/MCD/3300 / Re: DHCP Configuration on Redundant Controllers

« on: June 06, 2011, 03:33:51 PM »

Ralph, I don't quite understand what you are saying.  Can you please expand your answer a little bit if possible?  Thanks.

4

Mitel MiVoice Business/MCD/3300 / DHCP Configuration on Redundant Controllers

« on: June 06, 2011, 10:27:10 AM »

We are using two controllers as DHCP servers at two different locations.  The network side is configured properly (ip helpers, etc.).  We would like to use the exact same IP address ranges on both DHCP servers so in case of failure of the primary, the secondary would kick in with no visible IP address changes.  I know this is completely normal configuration for other DHCP servers (Windows, Linux, etc.) but I have been told that Mitel does not support this well and we are risking running into a situation where both controllers give away the same IP address causing duplicate IP address clashes.  Can someone please confirm this?