From: Ding Tianhong <dingtianh...@huawei.com> Date: Thu, 16 Jul 2015 16:30:02 +0800
> The "follow" fail_over_mac policy is useful for multiport devices that > either become confused or incur a performance penalty when multiple > ports are programmed with the same MAC address, but the same MAC > address still may happened by this steps for this policy: > > 1) echo +eth0 > /sys/class/net/bond0/bonding/slaves > bond0 has the same mac address with eth0, it is MAC1. > > 2) echo +eth1 > /sys/class/net/bond0/bonding/slaves > eth1 is backup, eth1 has MAC2. > > 3) ifconfig eth0 down > eth1 became active slave, bond will swap MAC for eth0 and eth1, > so eth1 has MAC1, and eth0 has MAC2. > > 4) ifconfig eth1 down > there is no active slave, and eth1 still has MAC1, eth2 has MAC2. > > 5) ifconfig eth0 up > the eth0 became active slave again, the bond set eth0 to MAC1. > > Something wrong here, then if you set eth1 up, the eth0 and eth1 will have > the same > MAC address, it will break this policy for ACTIVE_BACKUP mode. > > This patch will fix this problem by finding the old active slave and > swap them MAC address before change active slave. > > Signed-off-by: Ding Tianhong <dingtianh...@huawei.com> Applied and queued up for -stable, thanks. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
