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If you look at BGP best path selection (on Cisco at least) Local
Pref has always come before BGP AS Path, and it would be silly for
any provider to not local pref downstream customers first. Your only
other choice on this front would be to have an external system
monitoring your primary path, and actively bringing up/destroying
the BGP session with your backup path when required, however I'd say
this is more prone to error.<br>
<br>
<div class="moz-cite-prefix">On 14/04/15 14:07, Richard Thornton
wrote:<br>
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cite="mid:CA++rrJrW=GWig_8vqBU76oCGgR=9dwbkyr7Rd6hm5AbJ42xsvQ@mail.gmail.com"
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<div dir="ltr">Thanks Mark, I remember seeing that in the past and
thinking it was dodgy that they were modifying/ignoring my
prepends, looking at the best way to add resiliency at minimum
cost.<br>
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<div class="gmail_quote">On Tue, 14 Apr 2015 at 13:58 Mark Newton
<<a moz-do-not-send="true"
href="mailto:newton@atdot.dotat.org">newton@atdot.dotat.org</a>>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
On Apr 14, 2015, at 10:57 AM, Richard Thornton <<a
moz-do-not-send="true"
href="mailto:richie.thornton@gmail.com" target="_blank">richie.thornton@gmail.com</a>>
wrote:<br>
<br>
> Thanks Harry, so would you do something like 20mbit with
Vocus and 1mbit with Telstra on a high speed port burstable to
20mbit and basically set the local preference and AS prepends
to always use Vocus when it is up?<br>
<br>
No, Telstra will localpref any prefixes you send them, so the
Telstra link will carry all the traffic to you from AS1221 and
AS4637 even when the Vocus link is up.<br>
<br>
So you’ll likely need more than 1 Mbps commit to Telstra if
you have any capacity to them at all.<br>
<br>
What are you actually trying to achieve, in business terms?
Cost reduction? Resiliency? Something else?<br>
<br>
- mark<br>
<br>
<br>
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