Cisco 1751 Installation Guide download pdf (Page 28)

Cisco 1751 Voice-over-IP Quick Start Guide

78-11259-04

Configuring Voice-over-IP

Configuring Multilink PPP Interleaving

To configure multilink PPP and interleaving on a dialer, ISDN PRI or ISDN BRI interface, or a virtual

template, you must first configure multilink PPP and interleaving on the interface or template by entering

the following commands in interface configuration mode:

Router(config-if)# encapsulation ppp

Router(config-if)# ppp multilink

Router(config-if)# ppp multilink interleave

Optionally, configure a maximum fragment delay:

Router(config-if)# ppp multilink fragment-delay milliseconds

You can also reserve a special queue for real-time packet flows to specified destination User Datagram

Protocol (UDP) ports, allowing real-time traffic to have higher priority than other flows. You need the

following command only if you have not configured RSVP:

Router(config-if)# ip rtp reserve lowest-UDP-port range-of-ports

For virtual templates only, apply the virtual template to the multilink bundle:

Router(config-if)# multilink virtual-template 1

To create a virtual template interface, enter the following interface virtual-template global

configuration command:

Router(config)# interface virtual-template 1

RTP Header Compression

RTP header compression on a PPP, HDLC, or similar serial interface compresses the packet header to

reduce network overhead.

You should configure RTP header compression on a serial interface if you have either of the following:

• Links slower than 2 Mbps

• Need to save bandwidth

Note Do not use RTP header compression on links faster than 2 Mbps.

Configuring RTP Header Compression

Enable RTP header compression at both ends of the serial link by entering the following ip rtp

header-compression interface configuration command:

Router(config-if)# ip rtp header-compression

Note When you enter the show running-config command, the format of the ip rtp header-compression

command will change to ip rtp header-compression iphc-format.

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Cisco 1751 Installation Guide Page 28