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Configuring ATM Services
8-8 114056 Rev. A
Modifying Flush Protocol Variables
The Flush protocol ensures that data destined for a particular MAC address arrives
in sequence. This means that once the LEC issues a Flush request, the Flush
protocol drops any cells it receives for the particular MAC address until
The LEC receives a Flush response for that MAC address
The Flush timeout expires for that MAC address
If the client receives a flush response for the cell MAC address, the cells for this
MAC address begin flowing over a new virtual circuit. However, if the flush
timeout expires for this MAC address, the cells begin flowing to the BUS.
Enabling or Disabling the Flush Protocol
You can enable (the default selection) or disable the Flush protocol for any LEC.
When enabled, the Flush protocol drops cells with the current destination MAC
address until the LEC receives a Flush response for that MAC address or the Flush
Timeout expires (see the following section).
When disabled, cells containing the destination MAC address drop while waiting
for the Path Switching Delay to time out. After the Path Switching Delay time
elapses, the data automatically begins flowing over a new virtual circuit.
Setting the Flush Timeout
The Flush Timeout defines the amount of time the LEC waits to receive a Flush
response (after sending a Flush request) before it takes recovery action by
switching back to the BUS.
By default, the LEC waits 4 seconds for a Flush response. However, you can set
the Flush Timeout to a value from 1 through 4 seconds.
Site Manager: Flush Protocol: page A-39
Site Manager: Flush Timeout: page A-38
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