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Configuring the Junos OS to Enable Idle Cell Format and Payload Patterns for ATM Devices

 

ATM devices send idle cells to enable the receiving ATM interface to recognize the start of each new cell. The receiving ATM device does not act on the contents of idle cells and does not pass them up to the ATM layer in the ATM protocol stack.

By default, the idle cell format for ATM cells is (4 bytes): 0x00000000. For ATM 2 PICs and ATM MICs, you can configure the format of the idle cell header and payload bytes.

To configure the idle cell header to use the International Telecommunications Union (ITU-T) standard of 0x00000001, include the itu-t statement at the [edit chassis fpc slot-number pic number idle-cell-format] hierarchy level:

On a TX Matrix or TX Matrix Plus router, include the itu-t statement at the [edit chassis lcc number fpc slot-number pic pic-number idle-cell-format] hierarchy level:

By default, the payload pattern is cell payload (48 bytes). To configure the idle cell payload pattern, include the payload-pattern statement at the [edit chassis fpc slot-number pic pic-number idle-cell-format] hierarchy level:

On a TX Matrix router, include the payload-pattern statement at the [edit chassis lcc number fpc slot-number pic pic-number idle-cell-format] hierarchy level:

The payload pattern byte can range from 0x00 through 0xff.

For information about the TX Matrix router, see TX Matrix Router and T640 Router Configuration Overview. For information about the TX Matrix Plus router, see TX Matrix Plus Router Configuration Overview.