Cisco 1700 series Configurazione - Pagina 20

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Configuring Quality of Service Parameters

Multilink PPP over ATM with Link Fragmentation and Interleaving

This feature allows multilink PPP (MLPPP) encapsulation over a single slow link to fragment and

interleave packets to a small enough size that the delay requirements of delay-sensitive traffic will be

met.

Fragment size at the MLPPP bundle can be configured by using the virtual-template interface

bandwidth command and the ppp multilink fragment-delay command. The ideal fragment size for

MLPPP over ATM should allow the fragments to fit into an exact multiple of ATM cells. These

commands calculate fragment size using the following formula:

fragment size = bandwidth x fragment-delay / 8.

For example, if the MLPPP ATM header is 10 bytes and the AAL5 packet overhead is 8 bytes, the

fragment size for MLPPP over ATM can be calculated as follows:

fragment size = 48 x # of cells - 10 - 8.

In this case, 2 cells per fragment are desirable, so the fragment size is calculated at 78 bytes.

The total bandwidth usable on this interface is 75 percent of the value declared in the bandwidth

command. To change this default value, enter the max-reserved-bandwidth command.

LLQ must be enabled when you configure MLPPP with link fragmentation and interleaving.

The Cisco 1700 series routers only support PPP encapsulation for MLPPP with link fragmentation

Note

and interleaving. The dialer interface is not supported.

MLPPP + LFI Configuration

The following example shows a Cisco 1751 router configuration with MLPPP + LFI:

hostname zorro

username ruby-1 password 7 36497A4872384A

class-map match-all VOIP

match ip dscp 32

class-map CRITICAL

match access-group 100

policy-map 1751_ADSL

class CRITICAL

priority 48

class VOIP

priority 64

set ip precedence 6

interface ATM0/0

dsl operating-mode auto

no ip address

no atm ilmi-keepalive

int atm0/0.1 point-to-point

pvc 0/33

vbr-rt 160 160 1

tx-ring-limit 3

protocol ppp Virtual-Template1

interface Loopback1

ip address 10.0.0.10 255.255.255.255

Configuring an ADSL WAN Interface Card on Cisco 1700 Series Routers

OL-3317-03