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Services in a Converged WAN. Accessing the WAN – Chapter 1. Objectives. Describe how the Cisco Enterprise Composite Model (ECNM) provides integrated services over an Enterprise network. Describe the key WAN technology concepts. - PowerPoint PPT Presentation
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© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE I Chapter 6 1
Services in a Converged WAN
Accessing the WAN – Chapter 1
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 2
Objectives Describe how the Cisco Enterprise Composite
Model (ECNM) provides integrated services over an Enterprise network.
Describe the key WAN technology concepts.
Identify the appropriate WAN technologies to use when matching ECNM best practices with typical enterprise requirements for WAN communications.
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 3
Describe How ECNM Provides Integrated Services over an Enterprise Network Explain the purpose and function of WANs
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 4
Describe How ECNM Provides Integrated Services over an Enterprise Network Business growth
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 5
Describe How ECNM Provides Integrated Services over an Enterprise Network Cisco Enterprise Network Architecture Modules
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 6
Describe How ECNM Provides Integrated Services over an Enterprise Network Explain the purpose of Cisco Enterprise Architectures
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 7
Describe the Key WAN Technology Concepts Describe WAN functions in terms of the OSI Reference
Model
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 8
Describe the Key WAN Technology Concepts
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 9
WAN Data-Link-Layer protocols
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 10
Describe the Key WAN Technology Concepts Describe the switching technologies used for WANs in
an Enterprise setting
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 11
Connecting subscribers to WAN link
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 12
Select the Appropriate WAN Technology to meet ECNM Requirements
Describe how Enterprises use leased line services to provide a WAN connection
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 13
Circuit Switching options
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 14
Packet switching options
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 15
Factors to consider in WAN
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 16
Summary
A WAN is defined asA data communications network that operates beyond the geographic scope of a LAN
WAN primarily operate on layer 1 & 2 of the OSI model
WAN technologies include–Leased line
–ISDN
–Frame relay
–X.25
–ATM
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 17
Summary Cisco Enterprise Architecture
–This is an expansion of the hierarchical model that further divides the enterprise network into
•Physical areas
•Logical areas
•Functional areas
Selecting the appropriate WAN technology requires considering some of the following:
–WAN’s purpose
–Geographic scope of WAN
–Traffic requirements
–If WAN uses a public or private infrastructure
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 18
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE I Chapter 6 19
Point-to-Point Protocol (PPP)
Accessing the WAN – Chapter 2
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 20
Objectives Describe the fundamental concepts of point-to-point serial
communication including TDM, demarcation point, DTE-DCE functions, HDLC encapsulation, and serial interface troubleshooting.
Describe PPP concepts including PPP layered architecture, PPP frame structure, PPP session establishment, multiprotocol encapsulation support, link control protocol (LCP), network control protocol (NCP), and Internet Protocol Control Protocol (IPCP).
Configure PPP on a serial interface including enabling PPP encapsulation, verifying the PPP connection and troubleshooting encapsulation problems.
Configure PPP authentication including explaining PAP and CHAP authentication protocols, configuring PPP authentication using PAP and CHAP, and troubleshooting PPP authentication problems.
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 21
Describe the Fundamental Concepts of Point-to-Point Serial Communication Describe the concept of serial communication as the
basis of WAN technologies
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 22
Describe the Fundamental Concepts of Point-to-Point Serial Communication Explain how two or more data streams are transported
across a single physical connection using TDM
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 23
Describe the Fundamental Concepts of Point-to-Point Serial Communication Define the location of the demarcation point relative to
customer and service provider networks
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 24
Describe the Fundamental Concepts of Point-to-Point Serial Communication Explain the terms DTE and DCE with relative to the
location of devices in a network
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 25
Describe the Fundamental Concepts of Point-to-Point Serial Communication Describe how high-level data link control (HDLC) uses
one of three frame types to encapsulate data
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 26
Describe the Fundamental Concepts of Point-to-Point Serial Communication Explain when and how to configure HDLC
encapsulation on a router
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 27
Describe Point-to-Point Concepts Describe PPP in terms of its use in WAN links
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 28
Describe Point-to-Point Concepts Describe the general function of each layer of PPP
architecture
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 29
Describe Point-to-Point Concepts Define the three phases of PPP session establishment
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 30
Describe Point-to-Point Concepts Explain the role of the LCP in PPP
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 31
Describe Point-to-Point Concepts
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 32
Configuring PPP with Authentication Differentiate between PAP and CHAP
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 33
Configuring PPP with Authentication Describe how to use PAP to authenticate a PPP
connection
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 34
Configuring PPP with Authentication Describe how to use CHAP to authenticate a PPP
connection
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 35
Configuring PPP with Authentication Outline the PPP encapsulation and authentication
process on a flow chart
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 36
Configuring PPP
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 37
Configuring PPP with Authentication Explain how to configure a PPP connection with
authentication
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 38
Configuring PPP with PAP Authentication
Left(config)# interface Serial 0/0Left(config-if)# ip address 192.168.1.1 255.255.255.252Left(config-if)# encapsulation pppLeft(config-if)# ppp authentication pap
Configuration of Serial interface, addressing scheme
Right(config)# interface Serial 0/0Right(config-if)# ip address 192.168.1.2 255.255.255.252Right(config-if)# encapsulation pppRight(config-if)# ppp authentication pap
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 39
Configuring PPP with PAP Authentication
Left(config)# interface Serial 0/0Left(config-if)# ip address 192.168.1.1 255.255.255.252Left(config-if)# encapsulation pppLeft(config-if)# ppp authentication pap
Activation of PPP encapsulation, specify authentication type
Right(config)# interface Serial 0/0Right(config-if)# ip address 192.168.1.2 255.255.255.252Right(config-if)# encapsulation pppRight(config-if)# ppp authentication pap
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 40
Configuring PPP with PAP Authentication
Left(config-if)# encapsulation pppLeft(config-if)# ppp authentication papLeft(config-if)# ppp pap sent-username Left password LE
Set credentials that are sent during authentication
Right(config-if)# encapsulation pppRight(config-if)# ppp authentication papRight(config-if)# ppp pap sent-username Right password RI
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 41
Configuring PPP with PAP Authentication
Left(config-if)# encapsulation pppLeft(config-if)# ppp authentication papLeft(config-if)# ppp pap sent-username Left password LELeft(config)# username Right password RI
Set credentials, that are verified during authentication
Right(config-if)# encapsulation pppRight(config-if)# ppp authentication papRight(config-if)# ppp pap sent-username Right password RIRight(config)# username Left password LE
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 42
Configuring PPP with CHAP Authentication
Left(config-if)# encapsulation pppLeft(config-if)# ppp authentication chapLeft(config-if)# ppp chap hostname LeftLeft(config-if)# ppp chap password LELeft(config)# username Right password RI
Right(config-if)# encapsulation pppRight(config-if)# ppp authentication chapRight(config-if)# ppp chap hostname RightRight(config-if)# ppp chap password RIRight(config)# username Left password LE
What is the difference whenConfiguring the same witch CHAP?
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 43
Configure PPP on a Serial Interface Explain the output of the show interfaces serial
command
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 44
Configure PPP on a Serial Interface Explain the output of the debug ppp command
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 45
Debugging PPP Explain the output of the debug ppp authentication
command
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 46
Summary
PPP is a widely used WAN protocol
PPP provides multi-protocol LAN to WAN connections
PPP session establishment – 4 phasesLink establishment
Link quality determination
Network layer protocol configuration negotiation
Link termination
WAN Encapsulation–HDLC default encapsulation
–PPP
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 47
Summary
PPP authentication–PAP
•2 way handshake
–CHAP
•3 way handshake
–Use debug ppp authentication to confirm authentication configuration
PPP configuration–Done on a serial interface
After PPP configuration, use show interfaces command to display:
–LCP state
–NCP state
© 2006 Cisco Systems, Inc. All rights reserved. Cisco PublicITE 1 Chapter 6 48