Date: Wed, 15 Feb 2006 22:19:31 -0500 From: "Webster, Andrew" <awebster@connectalk.com> To: <freebsd-questions@freebsd.org> Subject: CARP question (interpretation clarification) Message-ID: <9D61D69E3C1F7F459C5513AD830EE2192BC2C2@mtlex01.connectalk.com>
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On FreeBSD 5.4-p8, the man page for CARP(4), has a paragraph about
net.inet.carp.preempt which reads :
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net.inet.carp.preempt Allow virtual hosts to preempt each
other. It
is also used to failover carp interfaces
as a
group. When the option is enabled and
one of
the carp enabled physical interfaces goes
down,
advskew is changed to 240 on all carp
inter-
faces. See also the first example.
Disabled
by default.
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If I understand this correctly, a system having multiple carp interfaces
would either see all carp interfaces as all MASTER or all BACKUP, but
not a combination of both?
On my system, I've got preempt turned on, but as shown below on my
"backup" machine, two carp interfaces are in BACKUP config, and one is
MASTER.
On the "master" machine of this pair, I have the reverse, two MASTER,
and one BACKUP corresponding to the appropriate subnets.
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Am I misinterpreting the documentation, or does the preempt function not
work the way I expected it to?=20
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r2# sysctl -a | grep preempt
net.inet.carp.preempt: 1
r2# ifconfig -a
=2E..
carp0: flags=3D41<UP,RUNNING> mtu 1500
inet 172.16.0.230 netmask 0xfffffc00=20
carp: BACKUP vhid 1 advbase 1 advskew 100
carp1: flags=3D41<UP,RUNNING> mtu 1500
inet 172.16.20.230 netmask 0xfffffc00=20
carp: BACKUP vhid 20 advbase 1 advskew 100
carp2: flags=3D41<UP,RUNNING> mtu 1500
inet 10.10.88.1 netmask 0xffffffe0=20
carp: MASTER vhid 88 advbase 1 advskew 100
=20
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Thanks!
=20
Andrew=20
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