"Has anyone ever heard of a multi-homed enterprise not running bgp with
either of 2 providers, but instead, each provider statically routes a block
to their common customer and also each originates this block in BGP?”
As stated before...yes this is a common practice.
"One of the ISP's in this case owns the block and has even provided a letter of
authorization to the other, allowing them to announce it in BGP as well.”
Yes, one ISP owns the block, both will aggregate the blocks and announce the
blocks to the global internet. BGP attributes will shape best path for routing;
i.e., AS-PATH, ORIGIN, LOCAL PREF. MEDS should take care of "leaking" routes.
So, is this design scheme viable? Yes, it is.
~Jay Murphy
IP Network Specialist
NM State Government
IT Services Division
PSB – IP Network Management Center
Santa Fé, New México 87505
"We move the information that moves your world."
“Good engineering demands that we understand what we’re doing and why, keep an
open mind, and learn from experience.”
“Engineering is about finding the sweet spot between what's solvable and what
isn't."
Radia Perlman
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-----Original Message-----
From: Dale Cornman [mailto:[email protected]]
Sent: Monday, June 07, 2010 2:50 PM
To: [email protected]
Subject: Strange practices?
Has anyone ever heard of a multi-homed enterprise not running bgp with
either of 2 providers, but instead, each provider statically routes a block
to their common customer and also each originates this block in BGP? One
of the ISP's in this case owns the block and has even provided a letter of
authorization to the other, allowing them to announce it in BGP as well.
I had personally never heard of this and am curious if this is a common
practice as well as if this would potentially create any problems by 2
Autonomous Systems both originating the same prefix.
Thanks
-Bill
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