more-specifics via IX

Mon Oct 15 14:05:57 UTC 2007

On Oct 15, 2007, at 9:48 AM, Mike Leber wrote:

>
>
> On Mon, 15 Oct 2007, Bradley Urberg Carlson wrote:
>> I have a few customers' customers, who appear at a local IX.  Due to
>> the MLPA-like nature of the IX, I hear their prefixes both at the IX
>> and via my own transit customers.  I normally use localpref to prefer
>> customer advertisements over peers' advertisements.
>>
>> There is a customer's customer who is advertising more-specifics  
>> at the
>> IX (and using a different source AS, to boot)
>
> Time to time you will see this.
>
> You could also hear the more specifics from another peer that is  
> one of
> their transit providers or you could hear them via one of your transit
> providers.
>
>> I can think of a couple ways to prevent hearing these, but thought I
>> should ask for suggestions first.
>
> You can do all kinds of things to other network's routes especially  
> when
> those routes aren't from your customers and what you are doing doesn't
> break connectivity (or solves a capacity problem and improves
> connectivity).  However, if you tweak routes of a paying customer  
> then you
> will need to consider what your answer to your customer will be for
> overriding their traffic engineering.

In this case it's his customer's customer... so no answer _necessary_  
(as I've learnt from experience)