MII Type 1 - device driver determines whether link is up or down. MII monitoring monitors only the state of the local interface. Warning: When ARP monitoring is used, bonding slaves will send out ARP requests without a VLAN tag, even if an IP address is set on a VLAN interface in the same subnet as the arp-ip-targets Unplug one of the cables to test if the link monitoring works correctly, you will notice some ping timeouts until arp monitoring detects link interface bonding> /pi 172.16.0.2 We will not change arp-interval value in our example, RouterOS sets arp-interval to 100ms by default. Having additional targets increases the reliability of the ARP monitoring.Įnable ARP interface bonding> set 0 link-monitoring=arp interface bonding> set 0 link-monitoring=arp arp-ip-targets=172.16.0.1 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. Meaning of each option is described later in this article. Otherwise all replies from the ARP targets will be received on the same link which could cause other links to fail.ĪRP monitoring is enabled by setting three properties link-monitoring, arp-ip-targets and arp-interval. If balance-rr and balance-xor modes are set, then the switch should be configured to evenly distribute packets across all links. This also gives assurance that traffic is actually flowing over the links.
It is not possible to use both methods at the same time due to restrictions in the bonding driver.ĪRP monitoring sends ARP queries and uses the response as an indication that the link is operational. 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.īonding in RouterOS currently supports two schemes for monitoring a link state of slave devices: MII and ARP monitoring. It is critical that one of the available link monitoring options is enabled. Note: bonding interface needs a couple of seconds to get connectivity with its peer. Add bonding interface on interface bonding> add slaves=ether1,ether2Īnd on interface bonding> add slaves=ether1,ether2Īdd addresses to bonding ip address> add address=172.16.0.1/24 ip address> add address=172.16.0.2/24 interface=bonding1.Make sure that you do not have IP addresses on interfaces which will be enslaved for bonding interface!.To make this possible, follow these steps: Let us assume that we have 2 NICs in each router (Router1 and Router2) and want to get maximum data rate between 2 routers. More details can be found in the LAG interfaces and load balancing page. Interface bonding creates a virtual interface that can load balance traffic over multiple interfaces. Note: Interface bonding does not create a interface with a larger link speed.
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