Date: Sun, 16 Dec 2007 16:59:29 -0500 From: "Niki Denev" <nike_d@cytexbg.com> To: "Han Hwei Woo" <hhw@astutehosting.com> Cc: freebsd-net@freebsd.org Subject: Re: is carp on if_bridge possible? Message-ID: <2e77fc10712161359u17ae857flee75401c85516f77@mail.gmail.com> In-Reply-To: <47659291.6050809@astutehosting.com> References: <2e77fc10712132129o810a608v4ec6a742f9860a63@mail.gmail.com> <47625B80.3090904@FreeBSD.org> <2e77fc10712140937i19741f9cwe717499b18012a9a@mail.gmail.com> <2e77fc10712161021x378114eeh8cc0b2e0809800db@mail.gmail.com> <47659291.6050809@astutehosting.com>
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On Dec 16, 2007 4:03 PM, Han Hwei Woo <hhw@astutehosting.com> wrote: > > Hi Niki, > > I hope I'm understanding you correctly, but the reason you're running > if_lag is so that failover will occur even if there is a switch failure? > > If you enable preempt by setting: sysctl net.inet.carp.preempt=1, and you > have a carp running on the routers' interface that goes through the > switches, all the carp interfaces would failover in the event of a switch > failure, including the external facing one. With bridging or link > aggregation, there is nothing to stop a router from staying the master on > the external interface, even if the switch it is connected to fails. > > > Cheers, > Han Hwei Woo > > Hi Han, Yes, I have net.inet.carp.preempt enabled, but i'm using carp only on the internal interfaces to provide virtual default gateway for the servers behind it. Each of the routers speaks BGP (using openbgpd) to our provider and has it's own fiber uplink. The routers are also directly connected to each other with iBGP and OSPF(using openospfd) so this is not an issue. Regards, Niki
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