Network Administration 4-21
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You create a trunk of virtual interfaces to eliminate a switch as a single point of failure.
A trunk of virtual interfaces is known as a second-level virtual interface.
NOTE: With second-level interfaces, if a switch fails and there is a failover to another
switch, it might take a few minutes for the spanning tree relay to be reconfigured.
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You can use second-level virtual interfaces on a single filer.
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You use second-level virtual interfaces on a single filer to maintain service even if a
switch fails.
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A subnetwork has two switches that are capable of trunking over multiple port con-
nections. The filer has a two-link multiple-mode trunk to one switch and a two-link
multiple-mode trunk to the second switch. You can create a second-level trunking sin-
gle mode that contains both of the multiple-mode trunks. When the second-level
trunk is configured using the ifconfig(1) command, only one of the two multiple-
mode trunks is brought up as the active link. If all the underlying interfaces in the
active trunk fail, the second-level trunk activates the link corresponding to the other
trunk.