Manual

Layer 2 Tunnel Protocol Version 3
cell-packing
80
Cisco IOS Releases 12.0(29)S and 12.2(25)S
cell-packing
To enable ATM over Multiprotocol Label Switching (MPLS) or Layer 2 Tunneling Protocol, Version 3
(L2TPv3) to pack multiple ATM cells into each MPLS or L2TPv3 packet, use the cell-packing command
in interface, ATM VC, or ATM VP configuration mode. To disable cell packing, use the no form of this
command.
cell-packing [cells] [mcpt-timer timer]
no cell-packing
Syntax Description
Defaults Cell packing is disabled.
Command Modes Interface configuration
ATM VC configuration
ATM VP configuration
Command History
Usage Guidelines
• The cell-packing command is available only if you configure the ATM virtual circuit (VC) or virtual
path (VP) with ATM adaptation layer 0 (AAL0) encapsulation. If you specify ATM adaptation layer
5 (AAL5) encapsulation, the command is not valid.
• Only cells from the same VC or VP can be packed into one MPLS or L2TPv3 packet. Cells from
different connections cannot be concantenated into the same MPLS packet.
• When you change, enable, or disable the cell-packing attributes, the ATM VC or VP and the MPLS
or L2TPv3 emulated VC are reestablished.
• If a PE router does not support cell packing, the PE routers sends only one cell per MPLS or L2TPv3
packet.
cells (Optional) The number of cells to be packed into an MPLS packet.
The range is from 2 to the maximum transmission unit (MTU) of the interface
divided by 52. The default number of ATM cells to be packed is the MTU of
the interface divided by 52.
If the number of cells packed by the peer provider edge router exceeds this
limit, the packet is dropped.
mcpt-timer timer (Optional) Specifies which timer to use. The default is 1.
Release Modification
12.0(25)S This command was introduced.
12.0(29)S Support for L2TPv3 sessions was added in Cisco IOS Release 12.0(29)S.