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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.
PXE
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Boot in MLAG
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Configuration
PXE passthrough behavior is very important in either an L2 or L3 MLAG configuration. Configuring nodes for network (PXE) boot when 802.3ad and MLAG are in place can prove difficult to use for such network configurations. Vendor implementation of PXE passthrough for MLAG can behave inconsistently, therefore active-backup bonding mode is strongly advised for use in this scenario.
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