The Cisco 819 Integrated Services Router (ISR) supports synchronous by default and asynchronous serial interface protocols. Configuring the serial interface in the. This lesson explains how to configure Router Serial Interfaces, DTE (Data Terminal Equipment) and DCE (Data Communications Equipment). Enabling Frame Relay Encapsulation. On a Cisco router, Frame Relay can be configured only on the supported interfaces; it's most commonly supported on synchronous. This is the default encapsulation on serial interfaces with Cisco. Basic PPP Configuration. Troubleshooting Serial Line Problems. Serial x is up, line protocol is down. I don't know why but line protocol is down on serial interfaces. Basic PPP Configuration – Cisco Skills. This tutorial will be going over Basic Configuration of PPP (Point- to- Point Protocol). This tutorial includes Basic Configuration tasks on a router, Configuring OSPF routing protocol, and Configuring PPP PAP and CHAP authentication. Cisco Switch Cheat Sheet; Cisco T1 Guide. Border Gateway Protocol; Frame Relay. See if you can ping either the customer's serial or ethernet IP of the router. The High-Speed Serial Interface (HSSI) is a DTE/DCE interface that was developed by Cisco Systems and T3plus Networking to address the need for high-speed. This chapter describes configuring the serial interface for Cisco 800M Series ISRs in the following sections: Configuring the Serial Interface. On a serial interface like this line is up line protocol is down is an indication that keepalives have failed. There are several things that can cause this. Let’s get started! We can see in the. The next couple of steps are assuming you already know the material. Next perform Basic Router Configurations (hostname, disable DNS lookup, EXEC password, message- of- the- day banner, and password for console and VTY connections, along with synchronous logging). After that, configure the interfaces on R1, R2, and R3 (with the IP addresses from the addressing table (remember to include the clock rate on serial DCE interfaces). Make sure that the IP addressing is correct and the interfaces are active by issuing the show ip interface brief command. Test and configure ethernet interfaces on PC1. R3 is able to ping 2. R3#show ip route. C 1. 92. 1. 68. 3. Fast. Ethernet. 0/1. O 1. 92. 1. 68. 1. Type the command show interface serial. This is the default encapsulation on serial interfaces with Cisco Routers. If you guessed that the link would go down you are correct. But also OSPF would get rid of that route in the routing table. You have to be careful when configuring PPP especially on a production network. You run the risk of making you network inoperable if you are not careful setting the different encapsulations. To change the encapsulation from HDLC. Go to the interface of the serial connection and type encapsulation ppp. This is the following output from R1. The first one we will use is (PAP) password authentication protocol. PAP is not a secure authentication protocol. Passwords are sent using plain text and only authenticates once. To set up PAP the username and password must match the other router. So for this example R1’s. CHAP stands for (Challenge Handshake Authentication Protocol) because of the challenge CHAP is a stronger authentication than PAP. CHAP also encrypts the password so it is not sent in plain text. The way to set up CHAP is fundamentally the same. However in this case the username will be R3. The password will be “knowing”. We than go into the serial interface that R3. You should be able to ping all the devices within the topology diagram. Hope this tutorial was helpful.
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January 2017
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