AudioCodes Mediant 4000 SBC, Руководство пользователя

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CHAPTER 31 HA Overview
Mediant 4000 SBC | User's Manual
■ Loss of physical (link) connectivity: If one or more physical network groups (i.e., Ethernet
port pair) used for one or more network interfaces of the active device disconnects (i.e., no link)
and these physical network groups are connected OK on the redundant device, a switchover
occurs to the redundant device.
■ Loss of network (logical) connectivity: No network connectivity, verified by keep-alive
packets between the devices. This applies only to the Maintenance interface.
● Switchover triggered by loss of physical connectivity in one or more Ethernet Group
is not done if the active device has been configured to a Preempt mode level of 10.
In such a scenario, the device remains active.
● After HA switchover, the active device updates other hosts in the network about
the new mapping of its Layer-2 hardware address to the global IP address, by
sending a broadcast gratuitous Address Resolution Protocol (ARP) message.
Viewing HA Status on Monitor Web Page
You can view the status of the HA system on the Monitor page of the device's Web interface. The
page provides a graphical display of both active and redundant devices, as shown below:
You can distinguish between active and redundant devices as follows:
■ Active device:
● Color of border surrounding device is green.
● Title above device is "Active Device". The default name is "Device 1".
■ Redundant device:
● Color of border surrounding device is blue.
● Title above device is "Redundant Device". The default name is "Device 2".
The Monitor page also displays the HA operational status of the device to which you are currently
logged in. This is displayed in the 'HA Status' field under the Device Information pane:
■ "Synchronizing": Redundant device is synchronizing with Active device
■ "Operational": The device is in HA mode
■ "Stand Alone": HA is configured, but the Redundant device is missing and HA is currently
unavailable
To view active alarms raised by the Active and Redundant devices, click the Alarms area to open
the Active Alarms page (see Viewing Active Alarms on page 733).
You can change the name of each device, as described in the following procedure:
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