Cell Concatenation Parameters

VCC cell relay encapsulation supports the concatenation (aggregation) of multiple ATM cells in a single encapsulated packet that is transmitted on the MPLS pseudowire.

You can use the atm cell-packing and atm mcpt-timers commands to configure the following parameters that control how the router performs cell concatenation:

• Maximum number of ATM cells that the router can concatenate in a single packet.
• Values (in microseconds) for each of the three ATM Martini cell packing timers maintained on the router. These timers define the time threshold that the router uses to concatenate ATM cells and transmit the cells in an MPLS packet on the pseudowire.
• Numeric identifier (1, 2, or 3) that indicates which of the three ATM Martini cell packing timers you want to use to detect timeout of the cell collection threshold.

Based on this configuration, the router attempts to concatenate the specified maximum number of ATM cells into an MPLS packet within the time interval allowed by the ATM Martini cell packing timer you selected. When the timer 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.

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