[176312] in North American Network Operators' Group
Re: eBGP Graceful-Restart and GR Helper Mode with external networks.
daemon@ATHENA.MIT.EDU (Mark Tinka)
Mon Nov 24 15:31:36 2014
X-Original-To: nanog@nanog.org
From: Mark Tinka <mark.tinka@seacom.mu>
To: nanog@nanog.org
Date: Mon, 24 Nov 2014 22:31:21 +0200
In-Reply-To: <CAN8DL0Xgmji_irbub+7ssCJ+f8oEvFUBSy2nUJQ5_+E+gOASzw@mail.gmail.com>
Reply-To: mark.tinka@seacom.mu
Errors-To: nanog-bounces@nanog.org
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On Monday, November 24, 2014 10:08:11 PM Chris Costa wrote:
> Is there a BCOP (or substantiated opinion) for
> negotiating eBGP Graceful-Restart and Graceful-Restart
> Helper-Mode with external networks? Implementation looks
> varied across a few larger transit providers, and in
> some cases implemented inconsistently within the same
> provider. Seeing most IX peers with GR disabled,
> although I don't see they've disabled GR Helper Mode.=20
> Apparently, Junos (12.3, at least) doesn't offer
> disabling GR Helper Mode for BGP.
We generally disable GR on eBGP sessions because different=20
peers (be they customers, upstreams or peers) have different=20
hardware/software that could make this tricky.
Internally, we run NSR on boxes with dual control planes.=20
This is recent, as several of your garden-variety (and=20
exotic) service provider network protocols and services are=20
now reasonably supported that it makes sense to migrate from=20
GR to NSR.
We don't generally run GR on boxes with single control=20
planes, as there could be operational impact when BFD is=20
involved under some circumstances. That said, GR Helper mode=20
tends to always be available even when GR is not enabled.
Mark.
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