Strange practices?

Murphy, Jay, DOH Jay.Murphy at state.nm.us
Mon Jun 7 16:49:46 CDT 2010


"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
 Please consider the environment before printing e-mail


-----Original Message-----
From: Dale Cornman [mailto:bstymied at gmail.com] 
Sent: Monday, June 07, 2010 2:50 PM
To: nanog at nanog.org
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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