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Network Administration 4-19
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In a single-mode trunk, only one of the interfaces is active. The other interfaces are on
standby, ready to take over if the active interface fails.
In Figure 4-3,
e0
and
e1
are part of the SingleTrunk1 single-mode trunk. The active
interface,
e0
, fails. Failure means that the link status of the interface is down, which
signals that the interface has lost connection with the switch. The
e1
interface takes
over and maintains the connection. The interface
e1
also takes over the MAC address
of the
e2
interface.
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With single-mode trunks, the filer performs takeover based on the absence of a link.
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In a multiple-mode trunk, all the interfaces are active. This provides greater speed
than a single interface.
A multiple-mode trunk requires a switch that supports manually configurable trunking.
The switch determines how the load is balanced among the interfaces.
In Figure 4-4,
e0
,
e1
,
e2
, and
e3
are part of the MultiTrunk1multiple-mode trunk. All
four interfaces in the MultiTrunk1multiple-mode trunk are active.
Switch
SingleTrunk1 SingleTrunk1
Switch
e0 e1
e0 e1
e0 fails