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nagylzs
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IEEE 802.3ad (LACP) transmit-hash-policy on SwOs

Sat Oct 10, 2020 4:35 pm

Hi! The documentation az https://help.mikrotik.com/docs/display/ROS/Bonding says this about IEEE 802.3ad (LACP):

> The ARP link monitoring is not recommended, because the ARP replies might arrive only on one slave port due to transmit hash policy on the LACP peer device. This can result in unbalanced transmitted traffic, so MII link monitoring is the recommended option.

Of course, the MII link monitoring has a flaw: it can only check connection state, but it cannot reliably tell if the packets are actually flowing. The ARP link monitoring is better from this perspecitve, and I was wondering if I would be safe to use it if I happen to know that the switch on the other side happens to be running SwOs. I went through this documentation: https://wiki.mikrotik.com/wiki/SwOS/CSS610#LAG and it only says that "IEEE 802.3ad (LACP) compatible link aggregation is supported". But it does not say what kined of transmit hash policy is used.

So the question is this: what kind of transmit hash policy is used in SwOs? Is it documented somewhere?

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