[122121] in North American Network Operators' Group
Re: BFD over p2p transport links
daemon@ATHENA.MIT.EDU (Phil Bedard)
Sat Feb 6 00:21:31 2010
In-Reply-To: <803804.84064.qm@web53606.mail.re2.yahoo.com>
From: Phil Bedard <bedard.phil@gmail.com>
Date: Sat, 6 Feb 2010 00:20:54 -0500
To: Serge Vautour <serge@nbnet.nb.ca>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
We use it on all of our links which are generally over our own DWDM/dark =
fiber network. All links are 10G LAN PHY. Our DWDM systems propagate =
link failures but one of the main reasons we implemented it was our =
router vendors did not drop link during reboots during software =
upgrades. GR wasn't supported in those cases. We have had some issues =
with false positives but overall it has been running fairly stable for =
over a year. I've found the same issue with another router vendor where =
after an upgrade you may have to reload a line module, and the module =
does not drop link during a reload...=20
Phil=20
On Feb 5, 2010, at 9:45 AM, Serge Vautour wrote:
> Hello,
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> 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.=20
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> Since LAN-PHY doesn't have any built end-end alarming, some folks =
believe that we may encounter situations where a fiber break doesn't =
cause interfaces do go down. Convergence would then have to wait for IGP =
hellos to detect the problem.=20
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> Is anybody else running BFD over 10G LAN-PHY transport links? Any =
comments around BFD for this application in general?
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> Thanks,
> Serge
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> =
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