[VoiceOps] Geographic redundancy

Paul Timmins paul at timmins.net
Thu Aug 13 15:41:13 EDT 2009

Mark R Lindsey wrote:
> On Aug 13, 2009, at 12:46 PM, Kenny Sallee wrote:
>> * redundancy for CLEC
> In the case of a site fault, the remaining site would detect the fault 
> and assume full control. It's critically important in these designs 
> that the two call control servers have connectivity that's the most 
> reliable part; i.e., if anything at all is working, then the two call 
> control servers should be able to communicate: If I'm a call control 
> server, it is impossible for me to determine whether the other 
> call-control server is dead, or if it's just not able to communicate 
> with me. If it's alive, but the two call control servers cannot 
> communicate, then both can become active and try to assume control of 
> the linkset. Bad stuff ensues.
It sounds like for the entire effort and cost of this, there's still a 
SPOF, not to mention it requires you always augment at 45% or lower so 
if you lose one server, you don't block.


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