Port Redundancy
Issue 2 July 2005 141
- "switchback-interval" - the minimum time (in seconds) that the primary port link has to be
up (following failure) before the system switches back to the primary port. If you set this
to zero, there is no switch back.
Intermodule Port Redundancy
The intermodule port redundancy feature supports one pair of redundant ports per stack. Unlike
Port Redundancy definitions, intermodule port redundancy definitions are retained after stack
renumbering. In other words, if you remove a switch which is not part of the redundancy
scheme, the redundancy definition is unaffected. This makes intermodule port redundancy a
better option for very important connections. In the example in Fi
gure 24, Intermodule Port
Redundancy is configured on ports in switch 1 (primary) and switch 4 (secondary). If switch 2 is
removed, the redundancy definition is retained, and is between switches 1 and 3.
Figure 24: Intermodule Port Redundancy
The secondary port is activated:
● when the primary port link is down, or
● when the module in the stack holding the primary port has been powered down or
removed.
Switching time for intermodule port redundancy is approximately 1 second.
Tip:
Tip: Defining intermodule port redundancy on ports with no link causes both ports to
be disabled. You should connect the link prior to attempting to define intermodule
port redundancy.
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