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Configuring the Timeout for Bundling of Layer 2 Circuit Cell-Relay Cells

 

Layer 2 cell-relay encapsulation supports the concatenation (aggregation) of multiple ATM cells in a single encapsulated packet that is transmitted on a pseudowire. By default, each packet contains one cell. For ATM interfaces with Layer 2 circuit cell-relay transport mode configured, you can configure the time threshold (in microseconds) that the router uses to concatenate ATM cells and transmit the cells in a single frame on the pseudowire. To set the period for which the ATM cells must be collected to be bundled in a single frame being transmitted on the pseudowire, include the cell-bundle-timeout statement at the [edit interfaces interface-name atm-options] or the [edit interfaces interface-name unit logical-unit-number] hierarchy level.

Based on this configuration, the router attempts to collect and concatenate ATM cells in a single ATM cell relay-encapsulated packet and transmit the packet on a pseudowire connection. When the router detects that the allotted time interval has expired, the router forwards the packet even if it contains fewer than the specified maximum number of aggregated cells per packet. The cell concatenation or bundling functionality is controlled by the timeout value and the maximum number of cells to be concatenated.

To configure the period for which the ATM cells are aggregated and bundled before they are transmitted in a single frame on a pseudowire connection:

  • Specify the number of microseconds for which the ATM cells must be bundled before the timer expires and the cells are transmitted in a single frame.

    When the router detects that the allotted time interval has expired, the router forwards the MPLS packet even if it contains fewer than the specified maximum number of aggregated cells per packet.