The show port Command

This command provides you with the most comprehensive port information, including status and counters for each of the line card modules' ports. If you do specify the port you are interested in receiving information about, then the output will be limited to that particular port. Otherwise, the output will include information about each and every port of your Catalyst switch. Refer to Example 8-9 for a sample output of the show port command. Table 8-6 provides the descriptions of show port...

Cisco Connection Online CCO

CCO provides a suite of interactive web-based services that offer open access to Cisco's information, systems, resources, and personnel 24 hours a day, 7 days a week, from anywhere in the world. Figure 1-4 displays CCO's home page (www.cisco.com). The online interactive services offered by Cisco over the Internet have evolved and grown over time. Today you have access to a wealth of technical knowledge, tips, bug information, support services, and other valuable resources all from one place....

Ping Command IPX and Apple Talk

Cisco IOS makes ping available for a number of protocols including IPX and AppleTalk. Ping for IPX and AppleTalk is available in user and privileged mode. Example 4-4 shows the syntax and the sample outputs for IPX and AppleTalk user mode pings. Example 4-4 User Mode ping (IPX and AppleTalk) Router> ping ipx 1000.0000.0c02.f3b4 Type escape sequence to abort. Sending 5, 100-byte Novell Echoes to 1000.0000.0c02.f3b4, timeout is 2 seconds Success rate is 0 percent (0 5) Router> ping appletalk...

ISDN Components and Reference Points

When ISDN is the choice of wide-area connection, the customer equipment may include terminal equipment (TE) (types 1 and 2), terminal adapters (TAs), and network termination (NT) equipment (types 1 and 2). A common two-wire facility forms the local access loop for ISDN. The line termination (LT) and exchange termination (ET) equipment are located at the edge of the service provider's network (see Figure 11-1). Figure 11-1 ISDN Components and Reference Points Figure 11-1 ISDN Components and...

Show ipx route

The show ipx route command is used to display a router's IPX routing table. This table contains information about connected IPX networks, static routes, and dynamic IPX routes leaned through IPX routing protocols in use (see Example 6-4). < 1-FFFFFFFE> IPX network number default Default route Codes C - Connected primary network, c - Connected secondary network S - Static, F - Floating static, L - Local (internal), W - IPXWAN, R - RIP, E - EIGRP, N - NLSP, X - External, A - Aggregate, s -...

DDR Triggers an ISDN Call

Before discussing or investigating ISDN Q.931 and establishment of an end-to-end circuit over the B channel(s), one must ensure that the router is properly configured to trigger the ISDN call for the appropriate traffic. To get Dial on Demand Routing (DDR) to function properly, your router needs to be configured with the following information The routing table must direct the appropriate traffic to the desired BRI interface (BRI is an example of an on-demand interface) as the exit point. This...

The Importance of SPID Numbers

ISDN Service Profile Identifier (SPID) is a configuration parameter that may or may not have to be configured on your router. This merely depends on the type of switch your service provider has and the software version on that switch.What is important to know, however, is that if the router does not need to have SPID number(s) configured, then it should not have any configured. In other words, having a SPID number configured when it is not needed should not be considered as a harmless extra...

Do I Know This Already Quiz

1 How are TE1 and TE2 different The ISDN terminal equipment (TE) is classified into two types TE2 and TE1. TE2 devices are non-ISDN terminals such as a standard telephone, a personal computer, or a router with no ISDN interface. TE1s are ISDN devices such as an ISDN telephone or a router with a BRI interface. 2 What kind of wiring is used between the TE and the network termination (NT) devices The TE1 (and TA) connects to Network Termination type 1 (NT1) using a four-wire cable (RJ48). You can...

Show memory Command

The show memory exec command is often used to check the amount of a router's free memory. In troubleshooting cases where router performance is the focus, this is a major command used to see the statistics about the router's memory. Example 4-9 displays a sample output (partial) of this command executed on a Cisco 2514 router. Example 4-9 A Sample Output of the show memory Exec Command Example 4-9 A Sample Output of the show memory Exec Command (Continued) Example 4-9 A Sample Output of the show...

CCO Case Management Toolkit

The CCO Case Management Toolkit is a web tool for customers with appropriate service arrangements to open, query, and update cases with Cisco TAC. Figure 1-10 displays the Case Open Help Guide (accessed from the TAC home page). Figure 1-10 The Case Open Help Guide JjsjCisco Technical Assistance Center (TAC) sco. com public support help, shtml I Profile I Feedback Search Map Help How to Use the Cisco World-Wide Technical Assistance Center Servi Order Status Em-all CCO Team This document provides...

Debug ip icmp

This command displays information about Internal Control Message Protocol (ICMP) transactions and allows you to monitor the ICMP messages sent and received by your router. Each ICMP message has a source, destination, type, and code number. RFC-792 provides complete coverage of the fields in debug ip icmp output. Example 5-8 is a debug ip icmp output sample that shows a case with five echo replies received, and a case with three host unreachable messages received. Example 5-8 debug ip icmp...

ISDN Layer

ISDN Layer 2 is concerned with the communication between the TE and the ISDN switch over the D channel. The LAPD protocol is used for this purpose. LAPD delivers control and signaling information between the TE (the router, for instance) and the ISDN switch. The LAPD protocol is formally specified in ITU-T Q.920 and ITU-T Q.921. The show isdn status command can be used to discover the status of ISDN Layer 2. If ISDN Layer 2 is reported as NOT Activated, you must first find out if ISDN Layer 1...

The show interfaces atm Command

As you can see from the sample output of the show interfaces atm command in Example 3-7, there are some fields displayed similar to those displayed when you issue other show interface commands. For example, the first line of the output of this command displays the state of the physical ATM interface along with the state of its link integrity, as explained in Table 3-6. Example 3-7 The show interfaces atm Command Output ATM1 0 is up, line protocol is up Hardware is cxBus ATM Internet address is...

Traceroute Command IP User and Privileged

Use the traceroute command to find the path between IP devices. Trace, introduced with the release 10.0 of Cisco IOS, is currently available only for the IP protocol. The traceroute command can be executed from the user and the privileged exec modes, but from the privileged exec mode, you have the ability to use the extended trace, which is more flexible and informative. NOTE The command traceroute is commonly used in its short form, trace. With the release 12.0 of Cisco IOS, traceroute is also...

General Problem Isolation Method for Tcpip Connectivity

In this section, a sample TCP IP network (with Microsoft hosts) is presented and the general requirements for proper operation of Telnet application in that network are specified. After that, the example is turned into a troubleshooting case. You will be walked through the step-by-step tests and checks you must run to isolate the cause of problems, and Example 5-13 debug ip ospf Command Output OSPF adjacency events OSPF events OSPF flooding OSPF lsa generation OSPF packets what you need to do...

CCIE Professional Development

Kennedy Clark, CCIE Kevin Hamilton, CCIE 1-57870-094-9 AVAILABLE NOW This volume provides an in-depth analysis of Cisco LAN switching technologies, architectures, and deployments, including unique coverage of Catalyst network design essentials. Network designs and configuration examples are incorporated throughout to demonstrate the principles and enable easy translation of the material into practice in production networks. Alvaro Retana, CCIE Don Slice, CCIE and Russ White, CCIE 1-57870-097-3...

Foundation Summary

The Foundation Summary is a collection of quick reference information that provides a convenient review of many key concepts in this chapter. For those of you who already feel comfortable with the topics in this chapter, this summary helps you recall a few details. For those of you who just read this chapter, this review should help solidify some key facts. For any of you doing your final prep before the exam, these tables and figures are a convenient way to review the day before the exam....

Catalyst 5000 Switch Diagnostic Tools ping and CDP

To make use of ping, the valuable IP connectivity testing tool, on a Catalyst switch, you must assign an IP address and subnet mask to the switch's system console 0 (SCO). Since SCO is assigned to VLAN number 1 by default (this is modifiable), you have to make sure that the IP address you assign to SCO is appropriate for VLAN 1. In other words, the IP address of SCO must be chosen from the address space IP subnet that corresponds to the VLAN number assigned to SCO. It is a common error to...

Apple Talk Connection Sequence

In order to troubleshoot AppleTalk connection problems, you must understand the AppleTalk connection sequence. The connection sequence often begins when an Apple Macintosh client opens the Chooser applet from Apple's pull-down menu. This action triggers the Macintosh device to send a GetZoneList request on its connected network. The Router(s) on the local segment respond using GetZoneList reply, based on their Apple Zone table and any GetZoneList filters that may be applied to their appropriate...

Show interface serial n

The output of the show interface serial n command gives you some information similar to the output of the show command for other types of interfaces. However, with this command you must also concentrate on the type of information that is particular to Frame Relay. Example 10-1 displays a sample output of this command for a Serial interface that is configured with the encapsulation frame-relay command and has three point-to-point subinterfaces. The line numbers in Example 10-1 were added for the...

Introduction

This book is one of the members of the Cisco Press family of publications that has been developed to help you prepare yourself for the Cisco Certification examinations. This book's specific target is the Support exam (formerly the Cisco Internetwork Troubleshooting CIT Exam). I am a Certified Cisco Systems Instructor, and CIT is one of the courses that I teach. I started teaching this course in the first quarter of 1999. I have passed both the old CIT 4.0 and the new Support exams, and I am...

About the Author

Ranjbar (CCNP) is an instructor and senior network architect for Global Knowledge, Cisco's largest training partner. He is a Certified Cisco Systems Instructor (CCSI) who teaches the Cisco Internetwork Troubleshooting course on a regular basis. Born in Tehran, Iran, Amir moved to Canada in 1983 and obtained his Bachelors degree in Computing and Information Science (1988) and Master of Science degree in Knowledge Based Systems (1991) from the University of Guelph (Guelph, Ontario). After...