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CCNP Practical Studies: Using DSL to Access a Central Site

Chapter Description

This sample chapter focuses on Digital Subscriber Line (DSL) technology, one of the most popular broadband access methods and a new topic on the CCNP exam.


This chapter covered ADSL technology, Cisco DSL hardware components, and the configuration of various DSL access architectures, such as IRB, RBE, PPPoA, and PPPoE. Keep in mind that each DSL access architecture has its advantages and disadvantages. You should further research these architectures to discover the best implementation for your DSL network environment.

Table 8-3 summarizes the commands used in this chapter.

Table 8-3 Summary of Commands Used in This Chapter



slot slot# cardtype

Configures a slot for a specific card type.

dsl-profile profile-name

Creates a DSL profile.

dmt bitrate max interleaved downstream dmt-bitrate upstream dmt-bitrate

Sets the maximum and minimum allowed bit rates for the fast-path and interleaved-path profile parameters.

dmt margin downstream dmt-margin upstream dmt-margin

Sets the upstream and downstream SNR DMT margins.

dmt check-bytes interleaved downstream bytes upstream bytes

Sets the upstream and downstream check bytes.

dmt interleaving-delay downstream delay-in-μsecs upstream delay-in-μsecs

Sets the interleaving delay parameter.

dmt training-mode {standard | quick}

Sets the training mode in a DMT profile.

bridge irb

Enables IRB.

bridge bridge-group protocol {ieee | dec}

Specifies the bridge protocol to define the type of Spanning Tree Protocol.

bridge bridge-group route protocol

Specifies a protocol to be routed in a bridge group.

bridge-group bridge-group

Assigns a network interface to a bridge group.

interface bvi bridge-group

Enables a bridge group virtual interface.

atm route-bridged ip

RBE command. Typically used to associate with an interface.

username name password secret

Configures a username and password for local authentication.

encapsulation aal5mux ppp Virtual-Template number

Configures PPPoA encapsulation and associates a virtual template with it.

interface virtual-template number

Creates a virtual template interface.

ip unnumbered interface-name-number

Conserves IP addresses by configuring the interface as unnumbered, and assigns the IP address of the interface type you want to leverage.

ip local pool name begin-ip-address-range[end-ip-address-range]

Creates the local IP address pool.

peer default ip address pool poolname

Specifies the pool for the interface to use.

ppp authentication {chap | pap | chap pap | pap chap} [if-needed] {default | list-name}[callin]

Enables CHAP or PAP authentication on the interface.

ip cef

Enables Cisco Express Forwarding switching.

vpdn enable

Enables VPDN configuration.

vpdn-group number
protocol pppoe

virtual-template template-number

Configures a VPDN group to accept the dial-in and to be used to establish PPPoE sessions. Specifies the virtual template that will be used to clone virtual-access interfaces.

ip mtu bytes

Sets the MTU size of IP packets sent on an interface.

show dsl profile

Displays the DSL profile you changed.

show dsl status

Displays the status of the DSL subscriber ports on a chassis.

show dsl interface atm slot/port

Shows the status of a DSL port.

show spanning-tree bridge-group

Displays information on which Spanning Tree Protocol is running.

show arp

Displays the entries in the ARP table.

show bridge group [verbose]

Displays the status of each bridge group in detail.

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