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fails, the stack will be broken in two. The Stack Link LED on the unit that
is no longer receiving traffic from the next unit up in the stack will begin
flashing to indicate that the stack link is broken.
When the stack fails, a Master unit is selected from the two stack segments,
either the unit with the Master button depressed, or the unit with the
lowest MAC address if the Master button is not depressed on any unit. The
stack reboots and resumes operations. However, note that the IP address
will be the same for any common VLANs (with active port connections)
that appear in both of the new stack segments. To resolve the conflicting
IP addresses, you should manually replace the failed link or unit as soon as
possible. If you are using a wrap-around stack topology, a single point of
failure in the stack will not cause the stack to fail. It would take two or
more points of failure to break the stack apart.
Note: If a stack breaks apart, the IP address will be the same for any
common VLANs (with active port connections) that appear in
both stack segments.
IP Interface for Stack Management
The stack functions as one integral system for management and
configuration purposes. You can therefore manage the stack through any
unit in the stack. The Master unit does not even have to include an active
port member in the VLAN interface used for management access.
However, if the unit to which you normally connect for management
access fails, and there are no active port members on the other units within
this VLAN interface, then this IP address will no longer be available. To
retain a constant IP address for management access across fail over events,
you should include port members on several units within the primary
VLAN used for stack management.
S
O
TACK
PERATIONS
2-7
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