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Command Reference Guide Demand Interface Configuration Command Set
61200510L1-35E Copyright © 2005 ADTRAN 837
ppp multilink [fragmentation | interleave]
Use the ppp multilink command to enable multilink PPP (MPPP) operation on an existing PPP interface.
Use the no form of this command to disable.
Syntax Description
fragmentation Enables multilink fragmentation operation.
interleave Enables multilink interleave operation.
Default Values
By default, MPPP is disabled.
Applicable Platforms
This command applies to the NetVanta 1000R, 3000, 4000, and 5000 Series units.
Command History
Release 7.1 Command was introduced.
Release 7.2 Fragmentation and interleave operation were added.
Release 11.1 Command expanded to include the demand interface.
Functional Notes
When enabled, this interface is capable of the following:
• Combining multiple physical links into one logical link.
• Receiving upper layer protocol data units (PDU), fragmenting and transmitting over the physical links.
• Receiving fragments over the physical links and reassembling them into PDUs.
The fragmentation and interleave options can be used to enhance the multilink operation. Fragmentation is
used to reduce serialization delays of large packets. The fragmentation process evenly divides the data
among all links in the bundle with a minimum packet size of 96 bytes. The interleave operation is used with
streaming protocols to reduce delay by giving priority to packets identified as high priority. In order delivery
is guaranteed with multilink fragmentation, but is not guaranteed with multilink interleave operation.
The multilink bundle will remain active with a minimum of one physical link. Physical links may be
dynamically added or removed from the multilink bundle with minor interruption to traffic flow.
Usage Examples
The following example enables MPPP:
(config)#interface demand 1
(config-demand 1)#ppp multilink