master->backup CARP issue

Hello freebsd,


We have two FreeBSD boxes, each one has 4 CARP interfaces in preempt
mode, without arp balancing.

Backup without any reason preempts Master and after a while (an hour
or two) it becomes Backup again.
When Backup becomes Master on Master box
net.inet.carp.suppress_preempt: 1, but all interfaces are up and
seemed to work properly.


Is there any ways to debug this issue?


Additional info:

#uname -v
FreeBSD 6.1-RELEASE-p7

Master:
# grep carp /var/log/messages
Nov 14 01:50:59 atlas kernel: carp3: MASTER -> BACKUP (more frequent advertisement received)
Nov 14 01:52:30 atlas kernel: carp3: MASTER -> BACKUP (more frequent advertisement received)
Nov 14 02:43:55 atlas kernel: carp3: MASTER -> BACKUP (more frequent advertisement received)
Nov 14 02:59:12 atlas kernel: carp3: MASTER -> BACKUP (more frequent advertisement received)
Nov 14 03:26:13 atlas kernel: carp3: MASTER -> BACKUP (more frequent advertisement received)
Nov 14 03:26:32 atlas kernel: carp3: MASTER -> BACKUP (more frequent advertisement received)
Nov 14 04:58:39 atlas kernel: carp3: MASTER -> BACKUP (more frequent advertisement received)
Nov 14 05:53:27 atlas kernel: carp3: MASTER -> BACKUP (more frequent advertisement received)
Nov 14 06:01:12 atlas kernel: carp3: MASTER -> BACKUP (more frequent advertisement received)
Nov 14 06:03:36 atlas kernel: carp2: BACKUP -> MASTER (preempting a slower master)
Nov 14 06:03:36 atlas kernel: carp0: BACKUP -> MASTER (preempting a slower master)
Nov 14 06:03:36 atlas kernel: carp1: BACKUP -> MASTER (preempting a slower master)
Nov 14 06:03:38 atlas kernel: carp3: BACKUP -> MASTER (preempting a slower master)

Master & Backup (in normal state)
#sysctl -a | grep "net.inet.carp."
net.inet.carp.allow: 1
net.inet.carp.preempt: 1
net.inet.carp.log: 2
net.inet.carp.arpbalance: 0
net.inet.carp.suppress_preempt: 0

all NICs - 3Com 3c905C-TX

Master:
#ifconfig | grep -A2 carp
carp0: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
inet 10.1.1.3 netmask 0xffffff00
carp: MASTER vhid 1 advbase 1 advskew 10
carp1: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
inet 10.1.2.3 netmask 0xffffff00
carp: MASTER vhid 2 advbase 1 advskew 10
carp2: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
inet 10.1.3.3 netmask 0xffffff00
carp: MASTER vhid 3 advbase 1 advskew 10
carp3: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
inet 10.1.4.3 netmask 0xfffffff8
carp: MASTER vhid 4 advbase 1 advskew 10

Backup
#ifconfig |grep -A2 carp
carp0: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
inet 10.1.1.3 netmask 0xffffff00
carp: BACKUP vhid 1 advbase 1 advskew 20
carp1: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
inet 1.1.2.3 netmask 0xffffff00
carp: BACKUP vhid 2 advbase 1 advskew 20
carp2: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
inet 10.1.3.3 netmask 0xffffff00
carp: BACKUP vhid 3 advbase 1 advskew 20
carp3: flags=49<UP,LOOPBACK,RUNNING> mtu 1500
inet 10.1.4.3 netmask 0xfffffff8
carp: BACKUP vhid 4 advbase 1 advskew 20

Master:

#netstat -ni |grep carp
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
carp0 1500 <Link#12> 311894 1 5926852 0 0
carp0 1500 10.1.1 10.1.1.3 42293866 - 263238 - -
carp1 1500 <Link#13> 48653 1 5663615 0 0
carp1 1500 10.1.2 10.1.2.3 153785957 - 0 - -
carp2 1500 <Link#14> 48661 1 5663615 107 0
carp2 1500 10.1.3/24 10.1.3.3 476782 - 0 - -
carp3 1500 <Link#15> 48974 1 5663634 1155 0
carp3 1500 10.1.4.3/ 10.1.4.3 6885622 - 0 - -


Backup:

#netstat -ni |grep carp
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
carp0 1500 <Link#12> 35221 0 6437 0 0
carp0 1500 10.1.1 10.1.1.3 8699 - 0 - -
carp1 1500 <Link#13> 35220 0 6438 0 0
carp1 1500 10.1.2 10.1.2.3 86000 - 0 - -
carp2 1500 <Link#14> 35221 0 6437 0 0
carp2 1500 10.1.3/24 10.1.3.3 0 - 0 - -
carp3 1500 <Link#15> 35190 0 6443 23 0
carp3 1500 10.1.4.3/ 10.1.4.3 958 - 0 - -


Thanks in advance!


--
Best regards,
Eugene mailto:gonnabefun@xxxxxxxxx

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