Hi Matt,

I ran this past my support team.  They don't agree with this:

"AS prepending is fairly effective method.  Assuming you have more then just
a /24 network, you also can use selective advertising of more specific
prefixes through a preferred provider to influence inbound traffic."

"In this case having quality upstreams is not the issue at all.  This person
wants all their VOIP traffic to be symmetrically routed, at least from their
network control.  (Between the end points packets going over the Internet
may be asymmetrically routed and forcing symmetric routing could still be a
moot point.)  Regardless of the upstreams used they still want one to be the
primary and have the other for redundancy."

Jeff
 

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Matt Liotta
Sent: Wednesday, February 07, 2007 5:23 PM
To: WISPA General List
Subject: Re: [WISPA] BGP Question

Prepending is not an effective way of forcing other providers to send their
traffic through your preferred upstream. In fact, there is no good way to do
it at all. It is far better to just have quality upstreams.

-Matt

Don Annas wrote:
> When peering with multiple providers, is it a requirement that you 
> pick a primary to send and receive traffic or can you not prepend AS 
> hops and allow traffic to arrive to you via the 'best' BGP route.
>
> As a VoIP provider, it is important that traffic enter and leave via 
> the same provider.  We currently have a primary provider picked and 
> force traffic in by incrementing the AS prepends on our other BGP peers.
>
> There is still some traffic that enters our network via the other 
> peers regardless of the AS prepends and we are looking to either force 
> all traffic in and out one provider as long as that peer is up, or 
> preferably, allow traffic to enter whichever peer is the best route 
> while forcing the return traffic back out the connection that the traffic
entered.
>
> - Don Annas
> Triad Telecom, Inc.
> 336.510.3800 x111
> [EMAIL PROTECTED]
>
>   

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