![]() ![]() LACP balances outgoing traffic across the active ports based on hashed protocol header information and accepts incoming traffic from any active port. The standard also mandates that all devices in the aggregate must operate at the same speed and duplex mode. This standard also mandates that frames will be delivered in order and connections should not see misordering of packets. It includes automatic configuration of the aggregates, so minimal configuration of the switch is needed. Bonding modes 802.3adĨ02.3ad mode is an IEEE standard also called LACP (Link Aggregation Control Protocol). We will leave mii-interval to its default value (100ms). When unplugging one of the cables, the failure will be detected almost instantly compared to ARP link monitoring. interface bonding set link-monitoring=mii Having additional targets increases the reliability of the ARP monitoring. If only one target is set, the target itself may go down. It is possible to specify multiple ARP targets that can be useful in High Availability setups. The meaning of each option is described later in this article. ARP monitoring is enabled by setting three properties - link-monitoring, arp-ip-targets and arp-interval. Otherwise, all replies from the ARP targets will be received on the same link which could cause other links to fail. If balance-rr and balance-xor modes are set, then the switch should be configured to evenly distribute packets across all links. This gives assurance that traffic is actually flowing over the links. ![]() ![]() The ARP replies are not validated, any received packet by the slave interface will result in the slave interface considered as active. ARP MonitoringĪRP monitoring sends ARP queries and uses the response as an indication that the link is operational. It is not possible to use both methods at the same time due to restrictions in the bonding driver. Bonding in RouterOS currently supports two schemes for monitoring a link state of slave devices: MII and ARP monitoring. In the above example, if one of the bonded links were to fail, the bonding driver will still continue to send packets over the failed link which will lead to network degradation. ![]() It is critical that one of the available link monitoring options is enabled. The bonding interface needs a couple of seconds to get connectivity with its peers. ![]()
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