Cisco Router 800 Series Software Configuration Guide
Have a look at the manual Cisco Router 800 Series Software Configuration Guide online for free. It’s possible to download the document as PDF or print. UserManuals.tech offer 53 Cisco manuals and user’s guides for free. Share the user manual or guide on Facebook, Twitter or Google+.
4-3 Cisco 800 Series Software Configuration Guide 78-5372-06 Chapter 4 Network Scenarios Cisco 837 Router Network Connections In the example, the Cisco 827 router sends data or voice packets from the remote user to the service provider or corporate network through high-speed, point-to-multipoint asymmetric digital subscriber line (ADSL) technology. Cisco 837 Router Network Connections Figure 4-2 and Ta b l e 4 - 1 show an example of a network topology employing a Cisco 837 router connecting to the following: PSTN Corporate intranet Service provider on the Internet Service provider data center Dial backup and remote management Callout Number Description 1Corporate network connecting through a Cisco 3640 voice gateway 2Wholesale ISP business 3ISP POP (data center) with videoconferencing multipoint control units (MCUs) and IP/TV video servers 4Data and voice local exchange carrier connecting through a Cisco MGX voice gateway 5Small business or remote user, connecting to the network through a Cisco 827/827-4V router
Chapter 4 Network Scenarios Cisco 837 Router Network Connections 4-4 Cisco 800 Series Software Configuration Guide 78-5372-06 Figure 4-2 Cisco 837 Router Network Connections Callout Number Description 1Corporate network connecting through a Cisco 3640 voice gateway 2Wholesale ISP business 3ISP POP (data center) with videoconferencing MCUs and IP/TV video servers 4Dial backup or remote management that keeps the traffic working in case the primary line’s traffic shuts down 5PSTN to serve as an analog modem for dial backup or remote management 6Small business or remote user, connecting to the network through a Cisco 837 router DSLAMCisco 7200 Cisco 837 Cisco 3640 Cisco 6400 Cisco 6400 PSTNCisco 7200Cisco 6400ISP POP 82256 ISP POP ISP POP1 2 3 4 4 6 5
4-5 Cisco 800 Series Software Configuration Guide 78-5372-06 Chapter 4 Network Scenarios Cisco 831 Router Virtual Private Network Connections In the topology, the Cisco 837 router sends data packets from the remote user to the service provider or corporate network through high-speed, point-to-multipoint ADSL technology. Cisco 831 Router Virtual Private Network Connections Figure 4-3 and Ta b l e 4 - 3 show how the Cisco 831 router can be used in a Virtual Private Network (VPN). A Cisco 831 router is linked to the ISP via a digital subscriber line (DSL) or a cable modem. Security is provided via IP security (IPSec) configuration. Figure 4-3 Cisco 831 Router Virtual Private Network 82255 Cisco 831 routerxDSL or cable modem ISP PSTN Ethernet Cisco 831 routerxDSL or cable modem DES/3-DES IPSec Ethernet 1 2 3 3 4
Chapter 4 Network Scenarios Cisco 836 or Cisco SOHO 96 Network Connection 4-6 Cisco 800 Series Software Configuration Guide 78-5372-06 Cisco 836 or Cisco SOHO 96 Network Connection Figure 4-4 and Ta b l e 4 - 4 show an example of a network topology employing a Cisco 836 router or a Cisco SOHO 96 router connecting to the following: ISDN Corporate intranet Service provider on the Internet Service provider data center Dial backup and remote management Callout Number Description 1Small business or remote user, connecting to the network through a Cisco 831 router 2Corporate network connecting through a Cisco router 3Dial backup, as a failover link when primary line goes down 4Branch office network connecting through a Cisco router
4-7 Cisco 800 Series Software Configuration Guide 78-5372-06 Chapter 4 Network Scenarios Cisco 836 or Cisco SOHO 96 Network Connection Figure 4-4 Cisco 836 Router Network Connections Callout Number Description 1Corporate network connecting through a Cisco 3640 gateway 2Wholesale ISP business 3ISP POP (data center) with videoconferencing MCUs and IP/TV video servers DSLAMCisco 7200 Cisco 836 Cisco 3640 Cisco 6400 Cisco 6400 ISDNCisco 7200Cisco 6400ISP POP 82797 ISP POP ISP POP1 2 3 4 4 6 5
Chapter 4 Network Scenarios Internet Access Scenarios 4-8 Cisco 800 Series Software Configuration Guide 78-5372-06 Internet Access Scenarios This section provides information on the following topics related to Internet access: Before You Configure Your Internet Access Network Replacing a Bridge or Modem with a Cisco 827 Router PPP over Ethernet with NAT PPP over Ethernet with NAT Using a Dial-on-Demand PPP-over- Ethernet Connection PPP over ATM with NAT Configuring Dial Backup over the Console Port Configuring Dial Backup and Remote Management for the Cisco 837 and Cisco SOHO 97 Routers Configuring Dial Backup and Remote Management for the Cisco 836 and Cisco SOHO 96 Routers Configuring the DHCP Server Configuring the Ethernet Interface RFC 1483 Encapsulation with NAT Integrated Routing and Bridging Concurrent Routing and Bridging Data Network Voice Network 4Dial backup or remote management that keeps the traffic working in case of primary line shutdown 5ISDN to serve as an interface for dial backup or remote management 6Small business or remote user, connecting to the network through a Cisco 836 router Callout Number Description
4-9 Cisco 800 Series Software Configuration Guide 78-5372-06 Chapter 4 Network Scenarios Internet Access Scenarios Each scenario is described. Also, for each scenario, a network diagram, steps for configuring network scenarios, and a configuration example are provided. Before You Configure Your Internet Access Network You need to gather the following information before configuring your network for Internet access: Order an ADSL or G.SHDSL line from your public telephone service provider. For ADSL lines, determine that the ADSL signaling type is DMT, also called ANCII T1.413, or just DMT Issue 2. For G.SHDSL, verify that the G.SHDSL line conforms to ITU standard G.991.2 and supports Annex A, for North America, or Annex B, for Europe. Gather information to set up a PPP Internet connection, including the PPP client name authentication type and the PPP password. Determine the IP routing information, including IP address, and ATM permanent virtual circuits (PVCs). These PVC parameters are typically virtual path identifier (VPI), virtual circuit identifier (VCI), and traffic shaping parameters, if applicable. Gather DNS server IP address and default gateways. Replacing a Bridge or Modem with a Cisco 827 Router This scenario shows a remote user connected to the Internet. You may want to use a network similar to this one if you want to set up a minimal connection to the Internet and bridge it through the Cisco 827 routers. This network replaces an Alcatel 1000 bridge or modem with a Cisco 827 or Cisco 827-4V router by using AAL5SNAP encapsulation and bridging (RFC 1483 bridge mode) on the ATM interface.
Chapter 4 Network Scenarios Internet Access Scenarios 4-10 Cisco 800 Series Software Configuration Guide 78-5372-06 Figure 4-5 and Ta b l e 4 - 5 show the network topology for this scenario. Figure 4-5 Replacing a Bridge or Modem with a Cisco 827 Router The Cisco 827 router is configured to act as a bridge on the WAN, so the data packets are bridged through the Cisco 6400 router onto the Internet. This network setup allows the simplicity of bridging data but also maintains router control. This network is very simple, but it limits more complex services, such as stopping broadcast traffic. If you want more services available on your network, you may want to consider some of the others scenarios in this chapter. Configuring the Scenario NoteIf you have only a single ATM PVC for your bridging network, you do not have to configure the protocol bridge broadcast. This scenario includes configuration tasks and a configuration example. To add additional features to this network, see Chapter 7, “Router Feature Configuration.” Callout Number Description 1Small business or remote user, connecting to the network through a Cisco 827 or Cisco 827-4V router 2The Internet Cisco 827/827-4VDSLAM Cisco 6400DHCP74577 Cisco 6400 12
4-11 Cisco 800 Series Software Configuration Guide 78-5372-06 Chapter 4 Network Scenarios Internet Access Scenarios After configuring your router, you need to configure the PVC endpoint. For a general configuration example, see the “Cisco 3640 Gateway Configuration Example” section on page 4-89. Follow the steps below to replace a bridge or modem with the Cisco 827 router, beginning in global configuration mode. Each step includes the same values that are shown in the bridging configuration example at the end of this section. Command Task Step 1no ip routingDisable IP routing. Step 2bridge 1 protocol ieeeSpecify the bridge protocol to define the type of Spanning-Tree protocol. Step 3interface ethernet 0Enter configuration mode for the Ethernet interface. Step 4bridge-group 1Specify the bridge-group number to which the Ethernet interface belongs. Step 5no shutdownEnable the Ethernet interface. Step 6exitExit configuration mode for the Ethernet interface and the router. Step 7interface ATM 0Enter configuration mode for the ATM interface. Step 8pvc 8/35Create an ATM permanent virtual circuit (PVC) for each end node with which the router communicates. Step 9encapsulation aal5snapSpecify the encapsulation type for the PVC. Step 10bridge-group 1Specify the bridge-group number to which the ATM interface belongs. Step 11no shutdownEnable the ATM interface. Step 12exit Exit configuration mode for the ATM interface.
Chapter 4 Network Scenarios Internet Access Scenarios 4-12 Cisco 800 Series Software Configuration Guide 78-5372-06 Configuration Example The following is a configuration example for this network scenario. You do not have to enter the commands marked “default.” These commands appear automatically in the configuration file generated when you use the show running-config command. no ip routing ! interface Ethernet0 no ip address no ip directed-broadcast (default) bridge-group 1 ! interface ATM0 no ip address no ip directed-broadcast (default) pvc 8/35 encapsulation aal5snap ! bridge-group 1 ! ip classless (default) ! bridge 1 protocol ieee ! end PPP over Ethernet with NAT The Cisco 836 and 837 routers and the Cisco SOHO 96 and 97 routers support a PPP-over-Ethernet (PPPoE) client, with Network Addressing Translation (NAT) and with multiple PCs on the LAN. Figure 4-6 and Ta b l e 4 - 6 show a typical deployment scenario for PPPoE support.