Cisco Router 826 Routers Software Configuration Guide
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2-47 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 2 Network Scenarios Configuring the DHCP Server protocol ip 200.200.100.254 broadcast ! bundle-enable ! ip nat inside source list 1 interface ATM0 overload ip classless (default) ip route 0.0.0.0 0.0.0.0 200.200.100.254 ! access-list 1 permit 192.168.1.0 0.0.0.255 ! end Integrated Routing and Bridging This network shows a user connecting to the Internet using integrated routing and bridging (IRB) to use NAT across a bridged interface. This scenario might work for you if you want to add functionality to an endpoint router without reconfiguring the central site. For example, you can provide an IP address and NAT in a bridged network without having to reconfigure the central site for routing. Exchanging the bridge with a router enables feature additions such as voice and Quality of Service (QoS). IRB provides more secure control of the central site and more efficient use of the WAN link. Figure 2-13 shows an IRB scenario. Figure 2-13 IRB Internet Scenario One side of the network (WAN in this scenario) is configured to act as a bridge. The Bridge-Group Virtual Interface (BVI) is configured to act as a routed interface from the WAN bridge-group to the nonbridged LAN interface. From the LAN, the network appears as a router. From the WAN, the network appears as a bridge. The ATM interface uses AAL5SNAP encapsulation, and the number of PVCs is set by default. NAT, represented as the dashed line at the edge of the Cisco 827 routers, signifies two addressing domains and the inside source address. The source list defines how the packet travels through the network.1Small business or remote user3Connection to Ethernet 0 address 192.168.1.1/24 2ATM 0 PVC 8/354The Internet Cisco 827/827-4V 192.168.1.1/24DSLAMCisco 6400 Cisco 6400 74580 41 2 3
2-48 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 2 Network Scenarios Configuring the DHCP Server The following configuration topics are covered in this section: Configuring the Default Gateway Configuring the Ethernet Interface and IRB Configuring the ATM Interface Configuring the BVI Configuring NAT Configuration Example To add additional features to this network, see Chapter 3, “Basic Router Configuration,” and Chapter 4, “Advanced Router Configuration.” After configuring your router, you need to configure the PVC endpoint. For a general configuration example, see “Cisco 3640 Gateway Configuration Example” at the end of this chapter. Configuring the Default Gateway Enter the following command to set the IP route for the default gateway: ip route default-gateway ip address-mask Configuring the Ethernet Interface and IRB Follow the steps below to configure the Ethernet interface and IRB, beginning in global configuration mode. Configuring the ATM Interface Follow the steps below to configure the ATM interface, beginning in global configuration mode.Command Purpose Step 1bridge irbSpecifies IRB. Step 2bridge 1 route ipEnables IP routing to and from bridge-group 1. Step 3bridge 1 protocol ieeeSpecifies the bridge protocol to define the type of Spanning-Tree Protocol (STP). Step 4interface ethernet 0Enters configuration mode for Ethernet interface. Step 5ip address 192.168.1.1 255.255.255.0Sets the IP address and subnet mask for the Ethernet interface. Step 6no shutdownEnables the Ethernet interface. Step 7exitExits configuration mode for Ethernet interface. Command Purpose Step 1interface ATM 0Enters configuration mode for the ATM interface. Step 2pvc 8/35Creates an ATM PVC for each end node with which the router communicates. Step 3encapsulation aal5snapSpecifies the encapsulation type for the PVC.
2-49 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 2 Network Scenarios Configuring the DHCP Server Configuring the BVI Follow the steps below to configure the BVI, beginning in global configuration mode. Configuring NAT Follow the steps below to configure NAT, beginning in global configuration mode. Step 4bridge-group 1Specifies the bridge-group number to which the ATM interface belongs. Step 5no shutdownEnables the ATM interface. Step 6exitExits configuration mode for the ATM interface. Command Purpose Command Purpose Step 1interface bvi 1Enters configuration mode for the BVI. Step 2ip address 200.200.100.1 255.255.255.0Sets the IP address and subnet mask for the BVI. Step 3exitExits configuration mode for Ethernet interface. Command Purpose Step 1ip nat pool test 200.200.100.1 200.200.100.1 255.255.255.0 Creates pool of global IP addresses for NAT. Step 2access-list 101 permit ip 192.168.1 0.0.0.0.255 any logDefines a standard access list permitting addresses that need translation. Step 3ip nat inside source list 101 pool test overloadEnables dynamic translation of addresses permitted by access list to one of addresses specified in pool. Step 4interface ethernet 0Enters configuration mode for the Ethernet interface. Step 5ip nat insideEstablishes the Ethernet interface as the inside interface. Step 6no shutdownEnables interface and configuration changes just made to the interface. Step 7exitExits configuration mode for the Ethernet interface. Step 8interface ATM 0Enters configuration mode for the ATM interface. Step 9ip nat outsideEstablishes the ATM interface as the outside interface. Step 10no shutdownEnables interface and configuration changes just made to the interface. Step 11exitExits configuration mode for the ATM interface. Step 12interface bvi 1 Enters configuration mode for the BVI. Step 13ip nat outsideEstablishes the BVI as the outside interface.
2-50 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 2 Network Scenarios Configuring the DHCP Server Configuration Example In the following configuration example, 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. bridge irb ! interface Ethernet0 ip address 192.168.1.1 255.255.255.0 no ip directed-broadcast (default) ip nat inside ! interface ATM0 no ip address no ip directed-broadcast (default) ip nat outside no atm ilmi-keepalive (default) pvc 8/35 encapsulation aal5snap ! bridge-group 1 ! interface BVI1 ip address 200.200.100.1 255.255.255.0 no ip directed-broadcast (default) ip nat outside ! ip nat pool test 200.200.100.1 200.200.100.1 netmask 255.255.255.0 ip nat inside source list 101 pool test overload ip classless (default) ! bridge 1 protocol ieee bridge 1 route ip ! access-list 101 permit ip 192.168.1.0 0.0.0.255 any log ! ip route 0.0.0.0 0.0.0.0 200.200.100.254 (default gateway) ! end Concurrent Routing and Bridging This network shows a remote user connecting to the Internet using concurrent routing and bridging (CRB) to route voice traffic and bridge data traffic while keeping each of them separate. This scenario is useful if you want to simplify your network setup for data transmission and then configure voice. The IP address is configured to recognize the difference between data traffic and voice traffic (voice traffic is configured with QoS parameters and virtual circuits). IRB can do routing and bridging on the same interface; CRB does routing and bridging on separate interfaces. Step 14no shutdownEnables interface and configuration changes just made to the interface. Step 15endExits configuration mode for the BVI. Command Purpose
2-51 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 2 Network Scenarios Configuring the DHCP Server Figure 2-14 shows a CRB Internet scenario with the voice traffic routed and the data traffic bridged. Both the Cisco 827/827-4V router and the Cisco 3640 voice gateway are supporting voice traffic from telephones. Figure 2-14 CRB Internet Scenario Concurrent routing and bridging are accomplished using different subinterfaces under the ATM interface. Each ATM subinterface that is created is treated uniquely in the network. Data traffic in this scenario is bridged across ATM subinterface2, using AAL5SNAP encapsulation. A single PVC is created with a VPI/VCI value of 8/35. Voice traffic is routed across ATM0 subinterface 0.1. There is a single PVC created with a virtual path identifier and virtual channel identifier (vpi/vci) value of 1/40 for voice. The voice subinterface is configured with remote dial peers to determine where outgoing calls are sent and local dial peers to determine what numbers each port should respond to. Each VoIP dial peer is configured for H.323 signaling. The following configuration topics are covered in this section: Specifying CRB and Configuring the Ethernet Interface Configuring the ATM Interface and Subinterfaces Configuring Voice Ports Configuring the POTS Dial Peers Configuring VoIP Dial Peers for H.323 Signaling Configuration Example To add additional features to this network, see Chapter 3, “Basic Router Configuration” and Chapter 4, “Advanced Router Configuration.” After configuring your router, you need to configure the PVC endpoint. For a general configuration example, see “Cisco 3640 Gateway Configuration Example” at the end of this chapter. 1Small business or remote user3ATM connection, ATM0.1 PVC 1/40 Voice 1.0.0.1/24, ATM0.2 PVC 8/35 data 2Ethernet 0 bridge4The Internet Cisco 827/827-4V DSLAMCisco 6400 Cisco 6400 3640 Voice gateway 74581 4 1 23
2-52 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 2 Network Scenarios Configuring the DHCP Server Specifying CRB and Configuring the Ethernet Interface Follow these steps to specify CRB and configure the Ethernet interface, beginning in global configuration mode. Configuring the ATM Interface and Subinterfaces Follow these steps to configure the ATM interface and subinterfaces, beginning in global configuration mode. Configuring Voice Ports To configure voice ports, you must configure the POTS dial peers and the VoIP dial peers for the signaling type; in this case, the type is H.323. Command Purpose Step 1bridge crbSpecifies CRB. Step 2interface ethernet 0Enters configuration mode for the Ethernet interface. Step 3bridge-group 1Specifies the bridge-group number to which the Ethernet interface belongs. Step 4exitExits configuration mode for the Ethernet interface and the router. Step 5bridge 1 protocol ieeeSpecifies the bridge protocol to define the type of STP. Command Purpose Step 1interface ATM 0.1 point-to-pointSpecifies the ATM0.1 subinterface. Step 2ip address 1.0.0.1 255.255.255.0Sets the IP address and subnet mask for the ATM0.1 subinterface. Step 3pvc 1/40Creates an ATM PVC for each end node with which the router communicates. Step 4encapsulation aal5snapSpecifies the encapsulation type for the PVC. Step 5protocol ip 1.0.0.2 broadcastSets the protocol broadcast for the IP address. Step 6interface ATM 0.2 point-to-pointSpecifies the ATM0.2 subinterface. Step 7pvc 8/35Creates an ATM PVC for each end node with which the router communicates. Step 8encapsulation aal5snapSpecifies the encapsulation type for the PVC. Step 9bridge-group 1Specifies the bridge-group number to which the Ethernet interface belongs. Step 10no shutdownEnables the ATM interface. Step 11exitExits configuration mode for the ATM interface.
2-53 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 2 Network Scenarios Configuring the DHCP Server Configuring the POTS Dial Peers Follow the steps below to configure the POTS dial peers, beginning in global configuration mode. Ta b l e 2 - 3 shows the destination telephone number and port for each dial peer POTS port. Configuring VoIP Dial Peers for H.323 Signaling Use this table to configure VoIP dial peers for H.323 signaling, beginning in global configuration mode. Ta b l e 2 - 4 shows the destination telephone number for each voice dial peer. Command Purpose Step 1dial-peer voice number POTSEnters configuration mode for the dial peer. Step 2destination-pattern stringDefines the telephone number associated with the port. Step 3voice port-numberSpecifies the port number. Table 2-3 Mapping of Dial Peer Number to Destination Telephone and Port Dial Peer Number Destination Pattern Port 101 14085271111 1 102 14085272222 2 103 14085273333 3 104 14085274444 4 Command Purpose Step 1dial-peer voice number Vo I PEnters configuration mode for the dial peer. Step 2destination-pattern stringDefines the destination telephone number associated with each VoIP dial peer. Step 3codec g711ulaw Specifies a codec if you are not using the default codec of g.729. Step 4session target ipv4:1.0.0.2 Specifies a destination IP address for each dial peer. Table 2-4 Mapping of VoIP Dial Peers to Destination Telephone Numbers for H.323 VoIP Dial Peer Destination Pattern 1100 12123451111 1200 12123452222 1300 12123453333 1400 12123454444
2-54 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 2 Network Scenarios Configuring the DHCP Server Configuration Example In the following configuration example, 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. ip subnet-zero ! bridge crb ! interface Ethernet0 no ip address no ip directed-broadcast (default) bridge-group 1 ! interface ATM0 no ip address no ip directed-broadcast (default) no atm ilmi-keepalive (default) bundle-enable ! interface ATM0.1 point-to-point ip address 1.0.0.1 255.255.255.0 no ip directed-broadcast (default) pvc voice 1/40 protocol ip 1.0.0.2 broadcast encapsulation aal5snap ! interface ATM0.2 point-to-point no ip address no ip directed-broadcast (default) pvc data 8/35 encapsulation aal5snap ! bridge-group 1 ! ip classless (default) ! bridge 1 protocol ieee ! voice-port 1 local-alerting ! voice-port 2 local-alerting ! voice-port 3 local-alerting ! voice-port 4 local-alerting ! dial-peer voice 101 pots destination-pattern 14085271111 port 1 ! dial-peer voice 1100 voip destination-pattern 12123451111 codec g711ulaw session target ipv4:1.0.0.2 ! dial-peer voice 102 pots destination-pattern 14085272222
2-55 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 2 Network Scenarios Voice Scenario port 2 ! dial-peer voice 1200 voip destination-pattern 12123452222 codec g711ulaw session target ipv4:1.0.0.2 ! dial-peer voice 103 pots destination-pattern 14085273333 port 3 ! dial-peer voice 1300 voip destination-pattern 12123453333 codec g711ulaw session target ipv4:1.0.0.2 ! dial-peer voice 104 pots destination-pattern 14085274444 port 4 ! dial-peer voice 1400 voip destination-pattern 12123454444 codec g711ulaw session target ipv4:1.0.0.2 ! end Voice Scenario This section describes a voice scenario configuration using the Cisco 827-4V router in an H.323 signaling environment. Setting up voice on the router actually includes two configurations; one for data and one for voice. When you have completed the configuration for the data scenario, you can add voice by configuring the POTS and VoIP dial peers and voice ports. Scenarios for data and voice are discussed below.
2-56 Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Chapter 2 Network Scenarios Voice Scenario Data Network Figure 2-15 shows a data network with traffic routing through the Cisco 827 router and then switching onto the ATM interface. Figure 2-15 Data Network The Cisco 827 router is connected through the ATM interface through one PVC and it is associated with a QoS policy called mypolicy. Data traffic coming from the Ethernet must have an IP precedence below 5 (critical) to distinguish it from voice traffic. Enhanced IGRP is configured to send hello packets every 5 seconds to inform neighboring routers that it is functioning. If a particular router does not send a hello packet within a prescribed period, Enhanced IGRP assumes that the state of a destination has changed and sends an incremental update. NAT (represented as the dashed line at the edge of the Cisco 827 routers) signifies two addressing domains and the inside source address. The source list defines how the packet travels through the network. This scenario includes configuration tasks and a configuration example. To add additional features to this network, see Chapter 3, “Basic Router Configuration” and Chapter 4, “Advanced Router Configuration.” After configuring your router, you need to configure the PVC endpoint. For a general configuration example, see “Cisco 3640 Gateway Configuration Example” at the end of this chapter. 1Ethernet connection to a Cisco 827 router 2Ethernet connection 0/1 at address 172.17.1.1, subnet 255.255.255.0 3Ethernet connection 0 at 172.17.1.36, subnet 255.255.255.0 74582 DSLAM Cisco 827AT MCisco 6400 Cisco 6400 Cisco 3640Cisco 3640 20.20.20.20 255.255.255.0 ATM 0 10.10.10.20 255.255.255.0 PVC 8/35 PVC 0/40 10.10.10.36 255.255.255.0 1 2 3