Enterasys IRM2, Руководство пользователя

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Activating the Circuit 7-7
Redundancy
2. Enter the number of polls that must entirely fail before the redundant circuit
switches to the next backup port, then click
. The range is 1–16; the
default value is 3. Note that the retry count you set here applies only to the
currently selected circuit; you must specify a retry count for each individual
circuit.
If your primary port should fail and traffic is switched to a backup port, that
backup port will remain the active port unless it, too, fails, or until the primary
port is repaired and the circuits are tested. See
Testing the Circuits , page 7-8 , for
more information.
Activating the Circuit
Once you have defined all port paths for a circuit, designated the device
addresses to poll, and set the appropriate polling interval and number of retries,
you can activate the circuit.
The activation criteria for a circuit are:
• You must have at least two ports associated with the circuit: one as Primary,
and at least one as Backup
• You must have at least one address entered in the Polled Addresses list
To activate the circuit:
1. Use the drop-down list to display the appropriate circuit in the Current Circuit
text box; note that the current status of the selected circuit (enabled or
disabled) is displayed just below the Current Circuit text box.
2. Click Configure, and drag down to Enable to activate the currently selected
circuit. The defined redundancy scheme for that circuit will take effect, and the
displayed status for the selected circuit will change to Enabled.
3. Make all physical connections to your defined backup ports. Backup ports are
automatically disabled by management once a redundant circuit has been
enabled, and will not be re-enabled unless the primary port in the redundant
circuit fails, or unless they are manually re-enabled once the redundant circuit
has been disabled.
While redundancy is in effect, the Redundancy mode of the Chassis View
window will display the current active port in green; backup ports and failed
ports will both display in gray.
NOTE
If you are polling devices that are some distance from the IRM2, or if your network is
somewhat slow, be sure to set your polling interval and/or number of retries accordingly
to avoid the unnecessary use of backup ports.