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# Assigning Values to the ATM CLP Bit

The mark-clp command assigns a value of 0 or 1 to the ATM CLP bit for packets conforming to the current classifier control list.

Modules on E-series routers support classifying and marking of the ATM CLP bit according to the following rules:

- Modules on E120 and E320 routers support classifying of the ATM CLP bit only for frame-based interfaces (ATM Adaptation Layer 5 [AAL5] encapsulation), but not for individual ATM cells (ATM Adaptation Layer 0 [AAL0] encapsulation). In this case, if the CLP bit in any cell in the frame has a value of 1, the router treats the reassembled AAL5 frame as if it also had a CLP value of 1.
- Modules on E120 and E320 routers support marking of the ATM CLP bit on frame-based interfaces. In this case, every cell of the segmented frame leaves the router with the same CLP value.
- Modules on ERX-7xx models, ERX-14xx models, and the ERX-310 router support classifying and marking of the ATM CLP bit for individual ATM cells (AAL0 encapsulation), but not for frame-based interfaces (AAL5 encapsulation).

#### Related Topics

- mark-clp

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