question regarding multi-homing

Jason Shearer jshearer at amedisys.com
Thu Dec 31 08:00:20 CST 2009


>>Link up, receiving all routes but provider stops propagating your announcement outward.

Longer AS path prepending on your secondary connection should take care of this, eh?  Might end up with asymmetric routing but better than no traffic being returned.


>>Link up but unusably high packet loss to some or all destinations.

Assuming Cisco hardware what is the best way to handle this?  Setup some IP SLA and bind them to a tracking objects?  Use EEM and TCL scripting?

Thanks!
Jason

-----Original Message-----
From: William Herrin [mailto:herrin-nanog at dirtside.com]
Sent: Wednesday, December 30, 2009 12:25 PM
To: Simon Chen
Cc: nanog at nanog.org
Subject: Re: question regarding multi-homing

On Wed, Dec 30, 2009 at 12:02 PM, Simon Chen <simonchennj at gmail.com> wrote:
> I have a question regarding multi-homing, mostly from stub network's
> operational point of view. My big question is: what kind of failures
> do you usually see from your providers? Link down? Link up, but
> withdraw some routes? Link up, no route change, but blackholing
> partial or all traffic? Anything else?

Two more failure modes:

Link up, receiving all routes but provider stops propagating your
announcement outward.

Link up but unusably high packet loss to some or all destinations.

Regards,
Bill Herrin


--
William D. Herrin ................ herrin at dirtside.com  bill at herrin.us
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004


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