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Re: Granularity (was Re: [RRG] ALT + NERD is inelegant & inefficient, compared to APT or Ivip)

On 2008-01-25 05:08, Brian Dickson wrote:
> Brian E Carpenter wrote:
>>
>> Another point is that a normal scenario for a dual homed site wishing
>> to change one of its ISPs would be to triple-home for a while (i.e.
>> add ISP C while retaining ISPs A and B) and then drop A or B once things
>> are stable with C. So changing from 2 to 3 and then back to 2 should
>> be a simple operation, not two changes of mode.
>>   
> By changes of mode, presumably you mean multi-homed -> single-homed ->
> multi-homed?
> 
> I don't think that would be strictly necessary.
> 
> Each EID prefix is constructed based on a pair of upstreams.
> 
> However, there could be multiple EID prefixes, announced with different
> preferences on them.
> 
> They would be ABab, ACac, and BCbc. Sort them however you want, change
> them as C gets ironed out.
> 
> And eventually disconnect A or B, and magically the EIDs with A or B in
> them go away.
> 
> Obviously, in this scheme, removing an uplink could break existing
> connections, but I doubt that's a show-stopper.

Frankly this is beginning to make shim6 look simple and straightforward...

   Brian

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