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<div class="moz-cite-prefix">On 9/Jun/15 18:25, Joey ESQUIBAL wrote:<br>
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<blockquote
cite="mid:E4EF14F5-4DD7-4E1D-9C6B-8334CBE02034@isoceltelecom.com"
type="cite">
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Dear AfNOG,
<div class=""><br class="">
</div>
<div class="">I trust this e-mail finds everyone well.</div>
<div class=""><br class="">
</div>
<div class="">May I ask your opinion and or best practice about
having multiple IP transit to 4 different IPLC's.</div>
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</div>
<div class="">For argument’s sake, I have allocated sample
capacities on each circuit below:</div>
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<div class="">IPLC 1 (1 x STM4) => IP Transit 1</div>
<div class="">IPLC 2 (1 x STM4) => IP Transit 2</div>
<div class="">IPLC 3 (2 x STM1) => IP Transit 1</div>
<div class="">IPLC 4 (2 x STM1) => IP Transit 2</div>
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<div class="">All circuit ends to different geographical
locations.</div>
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<div class="">I’m thinking of having two IP transit (which I think
should be good already) and advertise specific prefix(es) on
each peer.</div>
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<br>
Possible.<br>
<br>
Since you're multi-homing to the same ISP's, you could ask each of
them to let you know whether they support BGP communities that would
allow you to influence routing within their network through the use
of LOCAL_PREF, AS_PATH prepend, e.t.c.<br>
<br>
This way, you can make your announcements uniform to avoid breaking
down prefixes, or you could break down prefixes but attach a
NO_EXPORT community to them, together with other BGP communities
your providers may support, so you get the load sharing without the
global pollution.<br>
<br>
In case your providers do not support BGP communities you can use,
then you may announce prefixes across each link as you see fit,
focusing on which PoP's are closer to the destinations your
customers are trying to reach, and getting as much bandwidth as you
can through those without running those links hot, in order to
reduce administration.<br>
<br>
Mark.<br>
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