Date: Wed, 1 Mar 2017 15:06:46 +0100 From: "Lutz Donnerhacke" <lutz@donnerhacke.de> To: <ari@ish.com.au> Cc: <freebsd-stable@freebsd.org> Subject: Re: CARP forcing failover Message-ID: <000001d29295$1260ec90$3722c5b0$@donnerhacke.de>
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> igb0.2: flags=3D8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> = metric 0 mtu 1500 > status: active > vlan: 2 vlanpcp: 0 parent interface: igb0 > carp: BACKUP vhid 3 advbase 1 advskew 50 > groups: vlan >=20 > That's two internal vlans and one external network. Each interface has = its > own vhid since that's the advice I had in the past. >=20 > Now, what command can I type that I could run remotely (SSH over the = em0 > link) to force all the CARP addresses simultaneously to decrease the = advskew > and become MASTER. Alternatively I could run something on the MASTER = to make > it BACKUP. Everything I've done so far is one command per interface = which has > got me in trouble before as I manage to accidentally remove my own = access to > the box before I'm done. You have to provide the correct subset of the parameters to change the = behaviour without changing the other properties. # ifconfig igb0.2 vhid 3 advbase 1 advskew 250 pass 'xxxx' This will change the parameters for the vhid 3 on the interface igb0.2 = only. But the change will cover *all* vhid parameters, so if you left some = off, they will vanish. Of course, you are free to use multiple IPs per interface using the = "alias" option. It does work even for carp instances. VHIDs needs to be unique per layer2 segment, because they are used as = selectors for the kernel code to validate the CARP packet. Please note, that VRRP/HSRP/GLBP may use the same packet format as CARP, = so their VHIDs should be different from yours.
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