[122098] in North American Network Operators' Group
Re: BFD over p2p transport links
daemon@ATHENA.MIT.EDU (Chuck Anderson)
Fri Feb 5 13:00:34 2010
Date: Fri, 5 Feb 2010 12:59:58 -0500
From: Chuck Anderson <cra@WPI.EDU>
To: nanog@nanog.org
Mail-Followup-To: nanog@nanog.org
In-Reply-To: <4B6C5A6F.2070601@redpill-linpro.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Fri, Feb 05, 2010 at 06:50:39PM +0100, Tore Anderson wrote:
> * Serge Vautour
>
> > I'm being asked to look into using BFD over our P2P transport links.
> > Is anyone else doing this? Our transport links are all 10G Ethernet
> > (LAN-PHY). There's no alarming inside of LAN-PHY like there is in
> > SONET. The transport side should propagate a fiber break by stopping
> > to send light on both ends. This is enough to cause the router
> > interfaces to drop and for protocols to converge.
>
> If only one strand in your fibre breaks, only the side that has the
> broken strand connected to Rx will see the physical interface go down.
> I've seen this happen with Extreme equipment at least.
Not if you leave Auto-Negotiation enabled, which provides Remote Fault
Indication.
