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CertificationZone Page 1 of 8 Date of Issue: 02-01-2000 Voice over IP/Frame Relay Lab Scenarios by Chris Ackerman Lab Scenario 1 - Voice over IP Objective Configuration of Router A Configuration of Router B Explanation of Router Commands Lab Scenario 2 - Voice over Frame-Relay Objective Configuration of Router A Configuration of Router B Explanation of Router Commands Lab Scenario 1 - Voice over IP Objective Your organization wants to call from one location to another via your private leased line, which is passing only IP traffic. Because of this, you decide that a VoIP solution is the best way to do go about providing communication between the two offices. As Network Administrator, you note that each site is using a Cisco 2610. You also find that there is room to put an FXS port on each of them. To make calling easy for the users, create a simple dialing plan. For the phone attached to Router A, dial 1001, and for the phone attached to Router B, dial 1002. Figure 1. Voice Over IP Lab Note that the WAN must be able to support traffic from the two Ethernet segments and provide quality voice service. http://www.certificationzone.com/studyguides.../?Issue=27&IssueDate=02-01-2000&CP= 11/06/01 CertificationZone Page 2 of 8 Configuration of Router A Building configuration... Current configuration: ! version 11.3 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname Router_A enable secret 5 $1$IM1E$54nbR7ceGJQHXdqCBMoTU. ! ip subnet-zero no ip domain-lookup ! dial-peer voice 101 voip destination-pattern 1002 ip precedence 5 session target ipv4:172.16.16.2 ! dial-peer voice 201 pots destination-pattern 1001 port 1/0/0 ! voice-port 1/0/0 vad ! voice-port 1/0/1 vad ! interface Ethernet0/0 ip address 172.16.17.1 255.255.255.0 ! interface Serial0/0 ip address 172.16.16.1 255.255.255.252 ! ip classless ! router eigrp 1 network 172.16.0.0 ! line con 0 transport input none line aux 0 line vty 0 4 password cisco login ! end Configuration of Router B Building configuration... Current configuration: ! version 11.3 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname Router_B enable secret 5 $1$IM1E$54nbR7ceGJQHXdqCBMoTU. ! ip subnet-zero no ip domain-lookup ! dial-peer voice 101 voip destination-pattern 1001 http://www.certificationzone.com/studyguides.../?Issue=27&IssueDate=02-01-2000&CP= 11/06/01 CertificationZone Page 3 of 8 ip precedence 5 session target ipv4:172.16.16.1 ! dial-peer voice 201 pots destination-pattern 1002 port 1/0/0 ! voice-port 1/0/0 timeouts call-disconnect 0 ! voice-port 1/0/1 timeouts call-disconnect 0 ! interface Ethernet0/0 ip address 172.16.18.1 255.255.255.0 ! interface Serial0/0 ip address 172.16.16.2 255.255.255.252 ! ip classless ! router eigrp 1 network 172.16.0.0 ! line con 0 transport input none line aux 0 line vty 0 4 password cisco login ! end Explanation of Router Commands Since both routers have similar configurations we will only look at Router A. Dial Peer statements are used to configure phone call routing. There are two basic dial peer statements: 1) ones that point to local voice ports, Dial-peer Pots, and 2) the ones that point to a remote system, Dial-peer VoIP. Each peer can be configured to respond in a unique way. For example, the dial-peer statement can place priority on the call packets. This can be configured by placing a higher IP precedence on the packets destined for the dial-peer VoIP remote IP address. VoIP packets with a precedence of 5 are given higher priority than packets from the Ethernet segments. dial-peer voice 101 voip destination-pattern 1002 ip precedence 5 session target ipv4:172.16.16.2 dial-peer voice 201 pots destination-pattern 1001 port 1/0/0 A voice port is a special type of router interface that accepts voice data from outside sources. Voice ports can be configured to take advantage of Voice Activated Detection (VAD). voice-port 1/0/0 vad ! voice-port 1/0/1 vad Lab Scenario 2 - Voice over Frame-Relay Objective As the CIO, you want to reduce the costs of your long distance phone bills. After doing some research you find that http://www.certificationzone.com/studyguides.../?Issue=27&IssueDate=02-01-2000&CP= 11/06/01 CertificationZone Page 4 of 8 the bulk of the long distance calls are made to the remote office. If these costs could be curtailed, the phone bill would be reduced by 60%. Already existing is a Frame-Relay network between the two sites with a CIR of 768 Kbps. Although the company needs this network to do business, you find that the traffic between the sites is a bit lower than the CIR even at peak. You have heard that Voice over IP is not as efficient as Voice over a Layer 2 protocol, so you decide to take advantage of your already existing Frame-Relay network to transport voice. Figure 1. Voice Over Frame-Relay Setup For employee satisfaction, you have decided that you want no calls to be blocked. Call traffic analysis has revealed that there are typically no more than four simultaneous calls between the offices. Build a Frame-Relay network using Cisco 3810 multi-service routers at each site. You will need to connect the routes to the local PBXs and direct traffic destined for the remote site to the 3810s. The 3810 routers will receive voice from the PBX, encode it using G.729a, and send to the remote 3810. A caller will dial 8 to access the 3810s before dialing the four digit extension of the remote office called party. Any four-digit number starting with 4 will be sent to the remote site and any four-digit number starting with 2 will be sent to corporate. Each of the 3810 routers has an Ethernet interface running IP. IP traffic between the two routers will need to be transported as well. Configuration of Router A ! Version 11.3 No service pad No service password-encryption ! hostname Router_A ! ! network-clock base-rate 64k no ip domain-lookup ! ! controller T1 0 framing esf http://www.certificationzone.com/studyguides.../?Issue=27&IssueDate=02-01-2000&CP= 11/06/01 CertificationZone Page 5 of 8 linecode b8zs channel-group 0 timeslots 1-24 speed 64 ! controller T1 1 framing esf clock source internal linecode b8zs mode cas voice-group 1 timeslots 1-4 type e&m-wink-start ! interface Ethernet0 ip address 172.16.17.1 255.255.255.0 ! interface Serial0 no ip address shutdown ! interface Serial1 no ip address shutdown ! interface Serial2 no ip address encapsulation frame-relay frame-relay traffic-shaping hold-queue 1024 out ! interface Serial2.1 point-to-point ip address 172.16.16.1 255.255.255.252 frame-relay interface-dlci 102 voice-encap 80 class-FR1 ! router eigrp 100 network 172.16.0.0 ! ip classless ! map-class frame-relay FR1 no frame-relay adaptive-shaping frame-relay cir 768000 frame-relay bc 1000 ! ! ! line con 0 line aux 0 line vty 0 4 password Cisco login ! ! voice-port 1/1 ! voice-port 1/2 ! voice-port 1/3 ! voice-port 1/4 ! dial-peer voice 20 vofr destination-pattern 4... session target serial0 102 ! dial-peer voice 30 pots destination-pattern 2... port 1/1 ! dial-peer voice 30 pots destination-pattern 2... port 1/2 ! dial-peer voice 30 pots destination-pattern 2... port 1/3 ! http://www.certificationzone.com/studyguides.../?Issue=27&IssueDate=02-01-2000&CP= 11/06/01 CertificationZone Page 6 of 8 dial-peer voice 30 pots destination-pattern 2... port 1/4 ! ! end Configuration of Router B ! Version 11.3 No service pad No service password-encryption ! hostname Router_B ! ! network-clock base-rate 64k no ip domain-lookup ! ! controller T1 0 framing esf linecode b8zs channel-group 0 timeslots 1-24 speed 64 ! controller T1 1 framing esf clock source internal linecode b8zs mode cas voice-group 1 timeslots 1-4 type e&m-wink-start ! interface Ethernet0 ip address 172.16.18.1 255.255.255.0 ! interface Serial0 no ip address shutdown ! interface Serial1 no ip address shutdown ! interface Serial2 no ip address encapsulation frame-relay frame-relay traffic-shaping hold-queue 1024 out ! interface Serial2.1 point-to-point ip address 172.16.16.2 255.255.255.252 frame-relay interface-dlci 201 voice-encap 80 class-FR1 ! router eigrp 100 network 172.16.0.0 ! ip classless ! map-class frame-relay FR1 no frame-relay adaptive-shaping frame-relay cir 768000 frame-relay bc 1000 ! ! ! line con 0 line aux 0 line vty 0 4 password Cisco login ! ! http://www.certificationzone.com/studyguides.../?Issue=27&IssueDate=02-01-2000&CP= 11/06/01 CertificationZone Page 7 of 8 voice-port 1/1 ! voice-port 1/2 ! voice-port 1/3 ! voice-port 1/4 ! dial-peer voice 20 vofr destination-pattern 2... session target serial0 201 ! dial-peer voice 30 pots destination-pattern 4... port 1/1 ! dial-peer voice 30 pots destination-pattern 4... port 1/2 ! dial-peer voice 30 pots destination-pattern 4... port 1/3 ! dial-peer voice 30 pots destination-pattern 4... port 1/4 ! ! end Explanation of Router Commands In this lab both of the routers are configured similarly. Each has one T1 CAS connection to the local PBX and a Frame-Relay connection to the remote router. Since this is true, only Router A will be examined. First, the channel rates must be set. 64 Kbps is used in this example. network-clock base-rate 64k The T-1 controller connecting to the PBX was set for CAS (Channel Associated Signaling). Notice that the configuration line "voice-group" was used instead of channel-group. Only four channels are used in this configuration because only four lines will ever be needed. controller T1 1 framing esf clock source internal linecode b8zs mode cas voice-group 1 timeslots 1-4 type e&m-wink-start Frame-Relay Traffic shaping commands must be configured on the serial port interface Serial2.1 point-to-point ip address 172.16.16.1 255.255.255.252 frame-relay interface-dlci 102 voice-encap 80 class-FR1 map-class frame-relay FR1 no frame-relay adaptive-shaping frame-relay cir 768000 frame-relay bc 1000 Voice ports are created based on the number of timeslots configured on the T-1 controller. voice-port 1/1 The dial plan must be configured to direct calls to the correct destination. VoFR dial-peers direct traffic to a remote frame-relay router. Pots dial-peers direct calls to a specific port on the local router. http://www.certificationzone.com/studyguides.../?Issue=27&IssueDate=02-01-2000&CP= 11/06/01 CertificationZone Page 8 of 8 dial-peer voice 20 vofr destination-pattern 4... session target serial0 102 ! dial-peer voice 30 pots destination-pattern 2... port 1/1 [IE-Mult-LS-F02] [2000-01-31-01] Copyright © 2000 Genium Publishing Corporation http://www.certificationzone.com/studyguides.../?Issue=27&IssueDate=02-01-2000&CP= 11/06/01