[c-nsp] BGP Balancing

[Jay Nakamura]

Yup, AS prepend and BGP communities.  Don't forget that you can
selectively adjust those per net blocks you are advertising so net A
comes in mostly in provider 1 and net B comes in provider 2 or some
other variation.  I didn't realize that when I first started doing BGP
15 years ago until someone mentioned it.


On Mon, Mar 22, 2010 at 1:29 AM, Muhammad Jawwad Paracha
<jawwad14 at gmail.com> wrote:
> Hi,
>
> Agree with Jay, AS path prepending is one good option to influence inbound
> traffic to load balance. Though you have to be precise with how many AS you
> are prepending to exactly load balance. But I have seen in web hosting
> environment that it sometime causes website user with problem of page not
> loading properly.
>
> These things need to be planned,and slowly implemented.
>
> Regards,
> Jawwad Paracha
> IBM
>
> On Mon, Mar 22, 2010 at 10:09 AM, Jay Hennigan <jay at west.net> wrote:
>
>> On 3/21/10 9:53 PM, Chris Gotstein wrote:
>> > It's actually both, but i'm mostly concerned with inbound traffic.
>>
>> Inbound is trickier than out
>
> ound.  Many carriers offer a list of BGP
>> communities which can be used to influence how they treat your
>> advertisements, either by manipulating local preference, prepending, or
>> both.
>>
>> Many are listed here:
>>
>> http://onesc.net/communities/
>>
>> but ask your upstreams to be sure.
>>
>> Make small changes slowly.  Verify with external looking-glass sites to
>> ensure that you're getting the results you want.
>>
>>
>> --
>> Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
>> Impulse Internet Service  -  http://www.impulse.net/
>> Your local telephone and internet company - 805 884-6323 - WB6RDV
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