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3Com Router 3000 Ethernet Family
Configuration Guide
1.4.2 Configuring PPP Stac LZS Compression
Perform the following configuration in interface view.
The current system version supports the Stac compression described in RFC 1974.
Table 1-31 Configure PPP Stac LZS compression
Enable Stac LZS compression on the
interface.
Disable Stac LZS compression on the
interface.
By default, compression is disabled.
1.4.3 Configuring VJ TCP Header Compression for PPP Packets
Perform the following configuration in interface view.
Table 1-32 Configure VJ TCP header compression
Enable VJ TCP header compression on
the PPP interface.
Disable VJ TCP header compression on
the PPP interface.
By default, VJ TCP header compression is disabled on the PPP interface.
1.4.4 Configuring Link Fragmentation and Interleaving on PPP
The real-time interactive communication may be congested and delayed because of
large packets on the low-speed serial link. For example, the voice packet arrives while
the large packet is being dispatched and waiting for transmission, it can only be
dispatched upon the completion of the large packet transmission; thus, delay occurs.
For the real-time reference programs such as the interacting voice, congestion delay
resulted from large packet is too long. Link Fragment and Interleave (LFI) divides the
large data frame into small frames and then transmits them to the front of the
transmission queue and inserts the small packets that are sensitive to delay between
the fragments. In this way, the delay of small real-time packet is reduced and
fragments can be reassembled at the destination.
The LFI configuration tasks are described in the following subsections:
Enabling LFI
Configuring maximum time delay of LFI fragments
Operation
Operation
3Com Corporation
1-24
Chapter 1 PPP and MP Configuration
Command
ppp compression stac-lzs
undo ppp compression stac-lzs
Command
ip tcp vjcompress
undo ip tcp vjcompress
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