• mode= — Specifies one of four policies allowed for the bonding module. Acceptable values forthis parameter are:0 — Sets a round-robin policy for fault tolerance and load balancing. Transmissions arereceived and sent out sequentially on each bonded slave interface beginning with the first oneavailable.1 — Sets an active-backup policy for fault tolerance. Transmissions are received and sent outvia the first available bonded slave interface. Another bonded slave interface is only used ifthe active bonded slave interface fails.2 — Sets an XOR (exclusive-or) policy for fault tolerance and load balancing. Using thismethod, the interface matches up the incoming request's MAC address with the MAC addressfor one of the slave NICs. Once this link is established, transmissions are sent outsequentially beginning with the first available interface.3 — Sets a broadcast policy for fault tolerance. All transmissions are sent on all slaveinterfaces.4 — Sets an IEEE 802.3ad dynamic link aggregation policy. Creates aggregation groups thatshare the same speed and duplex settings. Transmits and receives on all slaves in the activeaggregator. Requires a switch that is 802.3ad compliant.5 — Sets a Transmit Load Balancing (TLB) policy for fault tolerance and load balancing. Theoutgoing traffic is distributed according to the current load on each slave interface. Incomingtraffic is received by the current slave. If the receiving slave fails, another slave takes over theMAC address of the failed slave.6 — Sets an Active Load Balancing (ALB) policy for fault tolerance and load balancing.Includes transmit and receive load balancing for IPV4 traffic. Receive load balancing isachieved through ARP negotiation.• miimon= — Specifies (in milliseconds) how often MII link monitoring occurs. This is useful ifhigh availability is required because MII is used to verify that the NIC is active. To verify thatthe driver for a particular NIC supports the MII tool, type the following command as root:ethtool | grep "Link detected:"In this command, replace with the name of the device interface, such aseth0, not the bond interface. If MII is supported, the command returns:Link detected: yesIf using a bonded interface for high availability, the module for each NIC must support MII.Setting the value to 0 (the default), turns this feature off. When configuring this setting, a goodstarting point for this parameter is 100.• downdelay= — Specifies (in milliseconds) how long to wait after link failure before disablingthe link. The value must be a multiple of the value specified in the miimon parameter. TheAppendix A. General Parameter...392
