Avaya Configuring PPP Services Bedienungsanleitung Seite 31
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PPP Concepts
114068 Rev. A 2-5
For example, a Configure-Request packet may specify the link’s maximum
transmission unit (MTU) size and whether the sender wants to use Password
Authentication Protocol (PAP) or Challenge Handshake Authentication Protocol
(CHAP). The Configure-Request packet contains the user-configured values,
which the sender and its peer router may need to negotiate.
Each router receives a Configure-Request packet from its peer. Each router
responds with one of three types of packets:
• Configure-ACK
If a router accepts the proposed LCP options, it responds with a Configure
Acknowledgment (ACK) packet.
When the routers on each side of the link send and receive Configure-ACK
packets, the LCP advances to an open state, which means that the PPP
interface can advance to the next phase.
• Configure-Reject
If the Configure-Request packet contains options that the peer router is not
willing to negotiate, the peer router sends back a Configure-Reject packet
specifying the nonnegotiable options. From that point on, Configure-Request
packets that the originating router sends should eliminate the unacceptable
options.
• Configure-NAK
If the peer disagrees with some or all of the values of the proposed options in
the Configure-Request packet, it responds with a Configure Negative
Acknowledgment (NAK) packet. The Configure-NAK packet notes the values
that the peer disagrees with, and it includes the corresponding values that the
peer would like to see in subsequent Configure-Request packets.
LCP negotiations between peers continue until either the routers converge (reach
an agreement regarding the Configure-Request) and PPP advances to the next
phase, until the peer router transmits a user-specified number of Configure-NAK
packets before sending a Configure-Reject packet, or until the configurable
convergence timer expires. When the originating router receives a
Configure-Reject packet, the originating router removes the offending options.
The routers should then converge.
Figure 2-2 demonstrates how a PPP interface initializes.
- Configuring PPP 1
- Services 1
- Bay Networks Software License 3
- Contents 5
- 114068 Rev. A vii 7
- 114068 Rev. A ix 9
- 114068 Rev. A xi 11
- About This Guide 13
- Before You Begin 14
- Conventions 14
- Acronyms 15
- 114068 Rev. A xvii 17
- Bay Networks Customer Service 18
- World Wide Web 19
- Customer Service FTP 19
- Support Source CD 20
- CompuServe 20
- InfoFACTS 21
- How to Get Help 21
- Chapter 1 23
- Starting PPP 23
- PPP Tasks 24
- Where to Go Next 25
- Router Router 27
- Synchronous Line 27
- PPP0001A 27
- 2-2 114068 Rev. A 28
- Routing over a PPP Link 29
- Initializing a PPP Interface 30
- PPP Concepts 31
- Router A Router B 32
- PPP0002A 32
- Datagram Encapsulation 34
- PPP Dial Services Support 35
- PPP Multiline 36
- PPP Multilink 37
- PPP0005A 38
- Circuit 38
- Bundle with 2 Links 38
- Balancing Traffic Loads 40
- Using Multilink Fragmentation 40
- PPP0004A 44
- PPP Data Compression 45
- 2-20 114068 Rev. A 46
- PPP Line Parameters 48
- Detecting Loopback Conditions 49
- PPP Interoperability 50
- Chapter 3 53
- Customizing PPP 53
- Setting Up Remote Addresses 54
- Configuring AppleTalk 56
- Enabling Bridging 57
- Enabling Ethernet Bridging 57
- Enabling FDDI Bridging 57
- Enabling Token Ring Bridging 57
- 3-6 114068 Rev. A 58
- 3-8 114068 Rev. A 60
- Customizing PPP Lines 61
- Editing PPP Line Parameters 62
- Setting the Restart Timer 63
- 3-12 114068 Rev. A 64
- 3-14 114068 Rev. A 66
- Customizing PAP 67
- 3-16 114068 Rev. A 68
- Customizing CHAP 69
- 3-18 114068 Rev. A 70
- 3-20 114068 Rev. A 72
- 3-22 114068 Rev. A 74
- Disabling Loopback Checking 76
- Deleting PPP 76
- Appendix A 79
- A-8 114068 Rev. A 86
- 89
- A-12 114068 Rev. A 90
- A-16 114068 Rev. A 94
- 95
- A-18 114068 Rev. A 96
- 98
- Configuring PPP Services 100
- A-22 114068 Rev. A 100
- PPP Parameters 101
- 102
- (continued) 105
- (continued) 106
- 114068 Rev. A Index-1 111
- 114068 Rev. A 112
- 114068 Rev. A Index-3 113
- 114068 Rev. A Index-5 115
- 114068 Rev. A Index-7 117
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