[afnog] local pref issue with HE

[Frank Habicht]

Hi Mark,

I'm seeing a good potential for suboptimal routing.

If you have a Provider TransitA connected to your East and a provider
TransitB connected to your West, and interconnection points far apart in
geography and latency, and TransitA also covers the location in your
West, then any traffic from on-net services and single-homed customers
of TransitA in the West will surely be routed to the East first before
given to you.

Which should cause some unnecessary latency, likely avoided by getting
service from TransitA in the West as well.

There might be plenty of other valid reasons to choose that setup
[ even interfaces cost $$$ ], but in my understanding that's a negative
aspect that remains.
And one should be aware of it.

If there's a general way to work around it, I'd be interested ;-)

Happy holiday season to all!

Frank


On 12/25/2015 10:04 AM, Mark Tinka wrote:
> 
> 
> On 23/Dec/15 20:45, Robert McKay wrote:
>  
>>
>> Really the only way to balance traffic is to have exactly the same
>> upstream ISPs as transits at every location.. otherwise if you have
>> different upstream ISPs at different locations, those ISPs (and their
>> customers) will only send you traffic at the location where you are
>> connected to them - even if there is a much closer path via a competitor.
> 
> We have not found this to be entirely true.
> 
> Provided the transit providers you are buying from are of equal global
> size, they can be different and still let you achieve balanced traffic
> across each of them, when taken from different locations.
> 
> Mark.
> 
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