Traffic Management - CCIE Routing and Switching Exam Certification Guide - page 531

Real-Time Protocol (RTP) Header Compression
RTP headers can be compressed on serial links by enabling Compressed RTP (CRTP). For
HDLC and PPP interfaces, you use the ip rtp header-compression [ passive ] command. On
Frame Relay interfaces, use the frame-relay ip rtp header-compression [ passive ] command.
Use CRTP on interfaces with Voice over IP (VoIP) traffic.
Frame Relay Compression
With Cisco routers, you can configure payload compression on point-to-point or multipoint
interfaces.
For point-to-point subinterfaces, you use the following command:
frame-relay payload-compress packet-by-packet
For multipoint subinterfaces, the command is as follows:
frame-relay map protocol protocol-address dlci
payload-compress packet-by-packet
FRF.9 Compression
Implementation FRF.9 of the Frame Relay Forum provides standards-based compression on
Frame Relay, therefore providing multivendor interoperability. FRF.9 specified per virtual
circuit compression for Frame Relay permanent virtual circuits (PVCs) or switched virtual
circuits (SVCs). The payload is compressed at the entry DLCI and decompressed at the
termination of the virtual circuit.
To enable FRF.9 compression on a point-to-point subinterface, use the following command:
frame-relay payload-compress frf9 stac
References Used
The following resources were used to create this chapter:
MLPS and VPN Architectures , Ivan Pepelnjak and Jim Guichard, Cisco Press, 2001
CCDA Exam Certification Guide , Anthony Bruno and Jacqueline Kim, Cisco Press, 2000
www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos_c/
qcfintro.htm
www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/qos_c/qcpart2/
qcwfq.htm
www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/rsvp.htm
www.cisco.com/warp/public/732/Tech/mpls/mpls_techdoc.shtml