Configuring Ppp Link Efficiency Mechanism; Configuring The Size Of The Mp Sort Window - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
Table 1-26 Assign the interface to the specified MP-group
Assign the interface to the specified
MP-group
Remove the interface from the specified
MP-group

1.3.3 Configuring the Size of the MP Sort Window

When MP applies, packets may be received out of order. The sort window is thus used
to re-order packets. The size of the sort window is a trade-off between re-ordering
effect and delay: a large sort window brings good re-ordering effect but increased
delay. For voice packets, transmission delay should be minimized.
Perform the following configuration in virtual template interface or MP-group interface
view.
Table 1-27 Configure the size of the MP sort window
Configure the size of the MP sort window
Restore the default size of the MP sort
window
The default size of the MP sort window is 1, that is, only one packet is sorted.

1.4 Configuring PPP Link Efficiency Mechanism

Four mechanisms are available for improving transmission efficiency on PPP links.
They are IP header compression (IPHC), Stac Lempel-Ziv standard (Stac LZS)
compression on PPP packets, V. Jacobson Compressing TCP/IP Headers (VJ TCP
header compression), and link fragmentation and interleaving (LFI).
I. IP header compression
IPHC is a host-to-host protocol that applies to transmit multimedia services such as
voice and video over IP networks. To decrease the bandwidth consumed by headers,
you may enable IP header compression on PPP links to compress RTP (including IP,
UDP, and RTP) headers or TCP headers. The following describes how compression
operates taking RTP header compression for example.
The real-time transport protocol (RTP) is virtually a UDP protocol using fixed port
number and format. Since its publication as RFC 1889, there has been growing
interest in using RTP as one step to achieve interoperability among different
Operation
Operation
3Com Corporation
1-20
Chapter 1 PPP and MP Configuration
Command
ppp mp mp-group number
undo ppp mp mp-group number
Command
ppp mp sort-buffer-size size
ppp mp sort-buffer-size size