[c-nsp] BGP peering visibility

[Nick Cutting]

Thanks Gert - I'll be switching back to the primary ISP tonight - and am awaiting information from the secondary.

I am really interested in how all the ISP's put their routing policies together - is there some or best practice system they work worth ?

 It is very difficult to find information outside of customer communities.  As a person who is on the outside looking in - I really want to know more about how the routing polices are built, with respect to customer and peers.
Even the CCIE service provider study material doesn't really talk about real world implementations of these polices - more just how each individual technology works.

NIck

-----Original Message-----
From: Gert Doering [mailto:gert at greenie.muc.de] 
Sent: 03 November 2015 22:26
To: Nick Cutting
Cc: Mark Tinka; Wycliffe Bahati; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] BGP peering visibility

Hi,

On Tue, Nov 03, 2015 at 09:32:01PM +0000, Nick Cutting wrote:
> And the theory being if they are using the route, due to LOCAL_PREF they will advertise it - and it is the communities they use, on behalf of the ones I sent, upstream that will influence their peers? - due to the non-transitive nature of LP?

Depending on the value of local-pref - if they set it to "lower than for other paths to that prefix", they won't use your path unless it is the only remaining one.

Now which particular values a network uses for local-pref is a local choice - the *default* value is 100, and "lower" means "worse", but people are free to use 1000 for "customers" and "999" for "peers", or anything else.  Talk to your upstream, this is the only way to figure out why they are still sending traffic to you and what you should be doing differently.

Now, if your upstream is not able to answer that question, *change* the upstream, because they are not worth the money you give them.  There's way too many idiots out there selling cheap bandwidth but not being able to spell BGP, let alone diagnose and debug it.

gert
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de