Cisco 1700 series Configurazione - Pagina 23

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bundle-enable

dsl operating-mode auto

interface ATM0/0.1 point-to-point

description COLLEGAMENTO

ip address 2.0.0.2 255.255.0.0

bundle MMA

class-bundle atm-bundle

pvc-bundle vip 0/33

class-vc vip

pvc-bundle high 0/34

class-vc high

pvc-bundle normal 0/35

class-vc normal

ATM Cell Loss Priority Bit Marking

When congestion occurs in an ATM network, ATM cells are discarded. One way to control which cells

are discarded is to use the cell loss priority (CLP) bit in the ATM header of each cell. The CLP bit may

be set to either 1 or 0. Those cells that have the CLP bit set to 1 are always discarded before any of the

cells with the CLP bit set to 0.

The ATM CLP bit marking feature allows you to control the CLP setting on Cisco routers. The marking

of the CLP bit is implemented on a per-packet basis so that the CLP bit of every ATM cell that belongs

to a particular packet is set to either 0 or 1.

Configuration Example

The following is an example of enabling ATM CLP bit marking using the set atm-clp command and

modular QoS command-line interface. In this example, all output packets that have an IP Precedence

value of 0 are sent with the CLP set to 1. Note that IP CEF must be on when using ATM CLP bit marking.

ip cef

class-map match-all prec0

match ip precedence 0

policy-map ATM_OUT

class prec0

set atm-clp

interface ATM0/0

dsl operating-mode auto

pvc 0/33

service-policy output ATM_OUT

Compressed RTP

The Real-Time Transport Protocol (RTP), as described in RFC 1889, is used to carry real-time data for

voice and video applications. For a typical Voice over IP (VoIP) application, the payload portion of the

packet can be smaller than the header. For instance, using the G.729 codec, the payload is 20 bytes, but

the IP, User Data Protocol (UDP), and RTP header is 40 bytes. It is inefficient to send the IP, UDP, and

RTP header across a slow link without compressing it. The Compressed Real-Time Transport Protocol

(cRTP) feature, as defined in RFC 2508, addresses this inefficiency by making the VoIP packet headers

smaller.

OL-3317-03

Configuring an ADSL WAN Interface Card on Cisco 1700 Series Routers

Configuring Quality of Service Parameters