Configuring Frf.9 Compression; Configuring Frf.20 Ip Header Compression - 3Com MSR 50 Series Configuration Manual

254 C 8: F R
HAPTER RAME ELAY
Configuring FRF.9
Compression
Configuring FRF.20 IP
Header Compression
C
ONFIGURATION
FRF.20
FRF.20 compresses the IP header of packets transmitted over frame relay. For
example, you may use it to compress voice packets to save bandwidth, decrease
load, and improve transmission efficiency on a frame relay network.
FRF.20 classifies packets into control packets and data packets. Control packets are
sent between FRF.20-enabled interfaces to negotiate status information. The
interfaces cannot exchange FRF.20 data packets before the negotiation succeeds.
If the negotiation fails after 10 attempts to send control packets are made, the
interfaces stop negotiation and their compression settings do not take effect.
FRF.20 compresses only RTP packets and TCP ACK packets.
Frame relay main interface is a P2MP interface, while frame relay subinterface
includes two types: P2P and P2MP. Therefore, the configuration of frame relay
FRF.9 compression varies by different interface types. For a P2P subinterface, use
the fr compression frf9 command to enable FRF.9 compression in subinterface
view. For a P2MP frame relay interface or subinterface, the frame relay
compression is configured when creating static address mapping.
Follow these steps to configure FRF.9 compression:
To do...
Enter system view
Enter frame relay interface or subinterface view
Configure FRF.9 For P2P subinterface, enable
compression (select FRF.9 compression
either one
according to
interface type)
For P2MP interface, enable
FRF.9 compression when
creating static address
mapping
Frame relay function provides IP header compression including RTP/TCP header
compression. You can enable IP header compression on interfaces or when
configuring static address mapping.
Follow these steps to configure FRF.20 IP header compression:
Use the
command... Remarks
system-view -
interface -
interface-type
interface-number
or
interface serial
interface-number.s
ubnumber
fr compression Optional
frf9
FRF.9 compression
is disabled by
default.
fr map ip Optional
{ ip-address
[ ip-mask ] |
default }
dlci-number
[ broadcast | [ ietf
| nonstandard ] ]*
compression frf9