Jeff Broadwick wrote:
"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."
AS prepending is not as effective as it used to be. I suggest you try it
if you disagree and see for yourself. Further, while doing more
specifics advertisements is effective from a traffic engineering
standpoint it doesn't address the original issue at all.
"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."
I completely disagree in regard to quality upstreams. We have seen first
hand some of the cheaper providers' practices of forcing asymmetric
routing because of their peering ratio requirements. Additionally, the
better providers support additional techniques such as BGP communities
to influence traffic routing.
-Matt
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