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Bonding is a technology that allows aggregation of multiple ethernet-like interfaces into a single virtual link, thus getting higher data rates and providing failover. 

Note

of bonding interface is determined by taInterface bonding does not create an interface with a larger link speed. Interface bonding creates a virtual interface that can load balance traffic over multiple interfaces. More details can be found in the LAG interfaces and load balancing page.

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PropertyDescription
arp (disabled | enabled | proxy-arp | reply-only; Default: enabled)Address Resolution Protocol for the interface.
  • disabled - the interface will not use ARP
  • enabled - the interface will use ARP
  • proxy-arp - the interface will use the ARP proxy feature
  • reply-only - the interface will only reply to requests originated from matching IP address/MAC address combinations which are entered as static entries in the "/ip arp" table. No dynamic entries will be automatically stored in the "/ip arp" table. Therefore for communications to be successful, a valid static entry must already exist.
arp-interval (time; Default: 00:00:00.100)Time in milliseconds which defines how often to monitor ARP requests
arp-ip-targets (IP address; Default: )IP target address which will be monitored if link-monitoring is set to arp. You can specify multiple IP addresses, separated by a comma
comment (string; Default: )Short description of the interface
disabled (yes | no; Default: no)Changes whether the bonding interface is disabled
down-delay (time; Default: 00:00:00)If a link failure has been detected, the bonding interface is disabled for a down-delay time. The value should be a multiple of mii-interval, otherwise, it will be rounded down to the nearest value. This property only has an effect when link-monitoring is set to mii.
forced-mac-address (MAC address; Default: none)By default, the bonding interface will use the MAC address of the first selected slave interface. This property allows to configure static MAC address for the bond interface (all zeros, broadcast or multicast addresses will not apply). RouterOS will automatically change the MAC address for slave interfaces and it will be visible in /interface ethernet configuration export
lacp-rate (1sec | 30secs; Default: 30secs)Link Aggregation Control Protocol rate specifies how often to exchange with LACPDUs between bonding peers. Used to determine whether a link is up or other changes have occurred in the network. LACP tries to adapt to these changes providing failover.
link-monitoring (arp | mii | none; Default: mii)Method to use for monitoring the link (whether it is up or down)
  • arp - uses Address Resolution Protocol to determine whether the remote interface is reachable
  • mii - uses Media Independent Interface to determine link status. Link status determination relies on the device driver.
  • none - no method for link monitoring is used.
Note: some bonding modes require specific link monitoring to work properly.
min-links (integer: 0..4294967295; Default: 0)How many active slave links needed for bonding to become active
mii-interval (time; Default: 00:00:00.100)How often to monitor the link for failures (the parameter used only if link-monitoring is mii)
mode (802.3ad | active-backup | balance-alb | balance-rr | balance-tlb | balance-xor | broadcast; Default: balance-rr)Specifies one of the bonding policies
  • 802.3ad - IEEE 802.3ad dynamic link aggregation. In this mode, the interfaces are aggregated in a group where each slave shares the same speed. It provides fault tolerance and load balancing. Slave selection for outgoing traffic is done according to the transmit-hash-policy more>
  • active-backup - provides link backup. Only one slave can be active at a time. Another slave only becomes active, if the first one fails. more>
  • balance-alb - adaptive load balancing. The same as balance-tlb but received traffic is also balanced. The device driver should have support for changing it's MAC address. more>
  • balance-rr - round-robin load balancing. Slaves in a bonding interface will transmit and receive data in sequential order. It provides load balancing and fault tolerance. more>
  • balance-tlb - Outgoing traffic is distributed according to the current load on each slave. Incoming traffic is not balanced and is received by the current slave. If receiving slave fails, then another slave takes the MAC address of the failed slave. more>
  • balance-xor - Transmit based on the selected transmit-hash-policy. This mode provides load balancing and fault tolerance. more>
  • broadcast - Broadcasts the same data on all interfaces at once. This provides fault tolerance but slows down traffic throughput on some slow machines. more>
mtu (integer; Default: 1500)Maximum Transmit Unit in bytes. Must be smaller or equal to the smallest L2MTU value of a bonding slave. L2MTU of a bonding interface is determined by taking the smallest value of all slaveslowest L2MTU value among its slave interfaces
name (string; Default: )Name of the bonding interface
primary (string; Default: none)Controls the primary interface between active slave ports, works only for active-backup, balance-tlb and balance-alb modes. For active-backup mode, it controls which running interface is supposed to send and receive the traffic. For balance-tlb mode, it controls which running interface is supposed to receive all the traffic, but for balance-alb mode, it controls which interface is supposed to receive the unbalanced traffic (the non-IPv4 traffic). When none of the interfaces are selected as primary, device will automatically select the interface that is configured as the first one.
slaves (string; Default: none)At least two ethernet-like interfaces separated by a comma, which will be used for bonding
up-delay (time; Default: 00:00:00)If a link has been brought up, the bonding interface is disabled for up-delay time and after this time it is enabled. The value should be a multiple of mii-interval, otherwise, it will be rounded down to the nearest value. This property only has an effect when link-monitoring is set to mii.
transmit-hash-policy (layer-2 | layer-2-and-3 | layer-3-and-4; Default: layer-2)Selects the transmit hash policy to use for slave selection in balance-xor and 802.3ad modes
  • layer-2 - Uses XOR of hardware MAC addresses to generate the hash. This algorithm will place all traffic to a particular network peer on the same slave. This algorithm is 802.3ad compliant.
  • layer-2-and-3 - This policy uses a combination of layer2 and layer3 protocol information to generate the hash. Uses XOR of hardware MAC addresses and IP addresses to generate the hash. This algorithm will place all traffic to a particular network peer on the same slave. For non-IP traffic, the formula is the same as for the layer2 transmit hash policy. This policy is intended to provide a more balanced distribution of traffic than layer2 alone, especially in environments where a layer3 gateway device is required to reach most destinations. This algorithm is 802.3ad compliant.
  • layer-3-and-4 - This policy uses upper layer protocol information, when available, to generate the hash. This allows for traffic to a particular network peer to span multiple slaves, although a single connection will not span multiple slaves. For fragmented TCP or UDP packets and all other IP protocol traffic, the source and destination port information is omitted. For non-IP traffic, the formula is the same as for the layer2 transmit hash policy. This algorithm is not fully 802.3ad compliant.

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