Cisco Systems MC-607 manual L2TP Protocol, Easy IP, Dhcp Server, MC-616

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Configuring Subscriber-End Broadband Access Router Features

Subscriber-End Broadband Access Router Data Operations

Figure 112 Cisco uBR900 Series Cable Access Router in a Routing Configuration with a Hub

CATV

coaxial cable

Cisco uBR7246

CMTS

HFC network

Cable

Modem

Ethernet

HUB

Ethernet

LAN

13306

L2TP Protocol

L2TP is an emerging Internet Engineering Task Force (IETF) standard that combines the best features of two existing tunneling protocols: Cisco Layer 2 Forwarding (L2F) and Microsoft Point-to-Point Tunneling Protocol (PPTP). L2TP is an extension of PPP, which is an important component for access VPNs.

Traditional dialup networking services only supported registered IP addresses, which limited the types of applications that could be implemented over VPNs. L2TP supports multiple protocols and unregistered and privately administered IP addresses over the Internet. This allows the existing access infrastructure such as the Internet, modems, access servers, and ISDN terminal adapters (TAs) to be used.

L2TP can be initiated wherever PPTP or L2F is currently deployed, and can be operated as a client initiated tunnel such as PPTP, or a network access server-initiated tunnel such as L2F.

The current implementation of L2TP in Cisco IOS software is dependent on a PPP connection supported on one of the directly attached interfaces. A dialup PPP connection is required in order to initiate an L2TP tunnel connection. This is a requirement of the L2TP Access Concentrator (LAC). Currently the Cisco uBR900 series cable access router cannot function as the LAC; it can only function as the L2TP Network Server (LNS), which terminates a tunnel created elsewhere in the network.

Easy IP

DHCP Server

Cisco uBR900 series cable access routers support Intelligent DHCP Relay and DHCP Client functionality. A DHCP Relay Agent is any host that forwards DHCP packets between clients and servers. A DHCP Relay Agent enables the client and server to reside on separate subnets. If the Cisco IOS DHCP server cannot satisfy a DHCP request from its own database, it can forward the DHCP request to one or more secondary DHCP servers defined by the network administrator using standard Cisco IOS IP helper-address functionality.

Network Address Translation and Port Address Translation

Network address translation (NAT) reduces the need for globally unique IP addresses. NAT allows an organization with addresses that are not globally unique to connect to the Internet by translating those addresses into globally routable address space.

Cisco IOS Multiservice Applications Configuration Guide

MC-616

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Contents Configuring Subscriber-End Broadband Access Router Features MC-607Subscriber-end Overview Cisco IOS Software Feature SetsMC-608 Home Office Easy IP Feature Set Base IP Bridging Feature SetMC-609 Telecommuter Feature Set Small Office Feature SetMC-610 Operating Modes MC-611Description Downstream Values Upstream Values Data SpecificationsMC-612 Service Assignments MC-613Bridging Applications Downstream and Upstream Data TransferMC-614 Routing Applications MC-615Dhcp Server L2TP ProtocolEasy IP Network Address Translation and Port Address TranslationVoice over IP Operations MC-617MC-618 Simplified VoIP over Cable NetworkVoice Compression and Decompression MC-619Protocol Stack MC-620Metric Value Subscriber-End Broadband Access Router Voice SpecificationsSgcp Protocol Stack MC-621Backup Pots Connection MC-622IPSec Network Security Docsis Baseline PrivacyMC-623 NetRanger Support-Cisco IOS Intrusion Detection Triple Data Encryption StandardFirewall MC-624Subscriber-End Broadband Access Router Configuration Options MC-625MC-626 Event Description MC-627Sequence Event Description MC-628MC-629 MC-630 Cable Modem Initialization Flowchart MC-631Subscriber-End Broadband Access Router Basic Troubleshooting MC-632MC-633 WaitforlinkupstateMC-634 UBR924# show controllers cable-modem 0 mac ?Event 2-Scan for a Downstream Channel, then Synchronize Event 1-Wait for the Link to Come UpMC-635 Event 3-Obtain Upstream Parameters Event 4-Start Ranging for Power AdjustmentsMC-636 Event 5-Establish IP Connectivity MC-637Event 8-Transfer Operational Parameters Event 6-Establish the Time of DayEvent 7-Establish Security Event 9-Perform RegistrationEvent 10-Comply with Baseline Privacy Event 11-Enter the Maintenance StateMC-639 Subscriber-End Broadband Access Router Configuration Tasks MC-640Command Purpose Configuring a Host Name and PasswordMC-641 Configuring Ethernet and Cable Access Router Interfaces MC-642Configuring Routing MC-643Verifying Routing MC-644Configuring Bridging MC-645MC-646 Reestablishing DOCSIS-Compliant Bridging MC-647Verifying DOCSIS-Compliant Bridging MC-648Using Multiple PCs with the Cable Access Router Customizing the Cable Access Router InterfaceMC-649 Basic Internet Access Bridging Configuration Example MC-650Basic Internet Access Routing Configuration Example MC-651IP Multicast Routing Configuration Example MC-652VoIP Bridging Using H.323v2 Configuration Example MC-653VoIP Routing Using H.323v2 Configuration Example MC-654NAT/PAT Configuration Example MC-655VoIP Bridging Using Sgcp Configuration Example MC-656IPSec Configuration Example MC-657L2TP Configuration Example MC-658MC-659 MC-660
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