Chapter 22: WAN Configuration Guide
310
DIGITAL GIGAswitch/Router User Reference Manual
Configuring Multilink PPP Bundles
The Multilink PPP (MLP) standard defines a method for grouping multiple physical PPP
links into a logical pipe, called an “MLP bundle”. Large packets are fragmented and
transmitted over each physical link in an MLP bundle. At the destination, MLP
reassembles the packets and places them in their correct sequence.
The following table describes the commands for configuring MLP:
Compression on MLP Bundles or Links
Compression can be applied on either a bundle or link basis if MLP is enabled on PPP
links. If compression is enabled on a bundle, the packets will be compressed
before
processing by MLP. If compression is enabled on a link, the packets will be compressed
after
the MLP processing.
In general, choose bundle compression over link compression whenever possible.
Compressing packets before they are “split” by MLP is much more efficient for both the
compression algorithm and the WAN card. Link compression is supported to provide the
widest range of compatibility with other vendors’ equipment.
Add PPP port(s) to an MLP bundle.
ppp add-to-mlp
<mlp >
port
<port list>
Create MLP bundle(s).
ppp create-mlp
<mlp >
slot
<mlp >
Set MLP encapsulation format.
ppp set mlp-encaps-format ports
<mlp >
[format short-format]
Set the size of frames that
fragmented for transmission on an
MLP bundle.
ppp set mlp-frag-size ports
<port list>
size
<size >
Set the depth of the queue used to
hold MLP packets for preserving
the packet order.
ppp set mlp-orderq-depth ports
<port list>
qdepth
<number-of-packets>
Set the depth of the queue used to
hold packet fragments for
reassembly.
ppp set mlp-fragq-depth ports
<port list>
qdepth
<number-of-packets>