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Bonding mode 1 (active-backup) is advised for “out of the box” multi-switch and MLAG configurations, whereas bonding mode 4 (802.3ad) needs additional configuration on the switch side to function. Since failover and traffic balancing with MLAG is proprietary to switch vendors, it is necessary to review switch capability to determine the appropriate bonding mode for MLAG (i.e., bonding mode 1 or 4 i.e. active-backup or 802.3ad).
Use of Multi-port NICs with Swarm
Swarm bonds the NIC ports it detects and uses a single IP address for the bond definition. Note that multiport network cards (two or more ports per card) aren’t considered fully redundant when used in Swarm storage hosts. Multiport NICs experience common failure modes which can disconnect a Swarm host completely. A true 'active-active' design includes the use of separate NICs in the storage hosts to meet that requirement.
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