[AusNOG] Attempting to understand DC internet connectivity

[Andrew Jones]

I can't say for sure regarding Telstra, but some providers will allow 
you to add communities to your announcement so that they have their 
local-pref set to be less-preferred in the provider's network than 
routes learned on peers/transit.

On 14.04.2015 14:12, Joseph Goldman wrote:
> 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.
>
> On 14/04/15 14:07, Richard Thornton wrote:
>
>> 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.
>>
>> On Tue, 14 Apr 2015 at 13:58 Mark Newton <newton at atdot.dotat.org> 
>> wrote:
>>
>>> On Apr 14, 2015, at 10:57 AM, Richard Thornton 
>>> <richie.thornton at gmail.com> wrote:
>>>
>>> > 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?
>>>
>>> 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.
>>>
>>> So you’ll likely need more than 1 Mbps commit to Telstra if you 
>>> have any capacity to them at all.
>>>
>>> What are you actually trying to achieve, in business terms? Cost 
>>> reduction? Resiliency? Something else?
>>>
>>>    - mark
>>
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