Strange practices?

Murphy, Jay, DOH Jay.Murphy at
Mon Jun 7 22:52:22 UTC 2010

Right on...


~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."

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From: dorn at [mailto:dorn at] On Behalf Of Dorn Hetzel
Sent: Monday, June 07, 2010 4:41 PM
To: Steve Bertrand
Cc: Murphy, Jay, DOH; nanog at
Subject: Re: Strange practices?


Perhaps the providers BGP is just being fed from interface anchored static routes which will, hopefully, drop out if the customer facing interface goes down.  Of course, this is realistic if we're talking about actual circuits like a T-1, not so much if we're talking metro ethernet or something...

On Mon, Jun 7, 2010 at 6:38 PM, Steve Bertrand <steve at> wrote:

On 2010.06.07 17:59, Murphy, Jay, DOH wrote:
> "So if the enterprise loses connectivity to one of these two providers, does the provider without working connectivity to the enterprise have mechanism in place to cease originating the address space?"
> Yes, BGP updates.

...again, I'm confused.

BGP updates from where to where? From how I understand the OP's original
question, there is no BGP.

Hence, if one of the providers is statically routing the prefix to an
interface or un-numbered as opposed to an IP address, then blackholing
can occur if IP reachability is broken, but the link-layer is not. Is
this not correct?



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