Date: Sun, 18 Sep 2011 15:00:22 +0200 From: Damien Fleuriot <ml@my.gd> To: Patrick Lamaiziere <patfbsd@davenulle.org> Cc: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org>, "Brian Seklecki \(Mobile\)" <lavalamp@probikesllc.com> Subject: Re: CARP interfaces and mastership issue Message-ID: <8811CF10-EB7D-4204-B66F-17B4B4ABCC1E@my.gd> In-Reply-To: <20110918124429.616282f5@davenulle.org> References: <4E71C059.5060404@hi-media.com> <4E7218A4.4000205@my.gd> <alpine.BSF.2.00.1109151208210.45497@vger.digitalfreaks.org> <CAE63ME4tLpSzfC1ENwaPs1iB-r1yHRs2Zj138iyM%2BW3s6vWyCA@mail.gmail.com> <60645CA5-D1E5-4AF9-9C56-66FA755B0280@digsys.bg> <alpine.BSF.2.00.1109172331080.45497@vger.digitalfreaks.org> <20110918124429.616282f5@davenulle.org>
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On 18 Sep 2011, at 12:44, Patrick Lamaiziere <patfbsd@davenulle.org> wrote: > Le Sat, 17 Sep 2011 23:40:06 -0400 (EDT), > "Brian Seklecki (Mobile)" <lavalamp@probikesllc.com> a écrit : > >>> >>>> What would help here, is for a carp interface to wait a given delay >>>> (tunable through a sysctl ?) after creation or after being brought >>>> up >> >> I see now. >> >> The tunable sounds like a good idea; we should check OpenBSD, they >> probably already implemented something and we're behind. >> >> If not, a "preempt dampener" feature would be an awesome return >> feature. >> >> Might need to implment another state: MASTER-LISTENING (or LEARNING) >> ah a STP. > > OpenBSD uses a "carp demote counter" that prevents to become master > (but it will become master anyway if there is not carp advertizement on > the interface). There is a sysctl in FreeBSD but it's readonly. > > This is used to delay carp until pfsync synchronization is done and by > daemons like bgpd. > > Anyway if carp becomes master when the interface is set up, it looks to > be a bug on FreeBSD (and if you are sure that the problem does not > come from the switch). This can be easily verified. When our vlan13 is forwarding on the switch, destroy and recreate the carp13 interface. It still assumes mastership during a short time, then yields and becomes backup.
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