Chapter 8 Troubleshoot Startup Problems

CLI Commands for Troubleshooting

show interface Mng — Displays IP address and auto-negotiation information for the management interfaces. Following is a sample output from the show interface Mng command.

Following isa sample output from the show interface Mng command.

ip address: 10.1.6.145

subnet mask: 255.255.0.0

Configured speed: auto, configured duplex: auto

AutoNegotiation is On, link is Up, actual speed: 100, actual duplex: half

show ip default-gateway— Displays the IP address of the configured default gateway. Following is a sample output from the show ip default-gatewaycommand.

Default gateway: 10.1.1.1

show ip route — Displays the entire routing table and the destination of last resort (default-gateway).

Following is a sample output from the show ip route command.

gateway of last resort is

10.1.1.1

show access-lists— Shows all access-lists or a specific access list.

Following is a sample output from the show access-listscommand.

Standard IP access list 1

Permit 10.1.1.0, wildcard bits 0.0.0.255 deny any

show telnet — Displays the status of the telnet server daemon ( status) or any active Telnet sessions ( sessions).

Following is a sample output from the show telnet command.

show telnet sessions

There is 1 active telnet session: Index Source

================

0 10.1.1.201 show telnet status Telnet deamon is enabled.

show line vty timeout — Shows the timeout configured for Telnet sessions.

Following is a sample output from the show line vty timeout command.

Timeout is 30 minutes

Troubleshooting the link interface subsystem:

show interface GigabitEthernet 0/# — Displays information for a specific GBE Interface.

Following is a sample output from the show interface command.

ip address: 10.1.6.145

subnet mask: 255.255.0.0

Configured duplex: auto

AutoNegotiation is On, link is Up, actual duplex: half

show interface GigabitEthernet 0/# counters — Displays the values of counters of a GBE interface.

 

 

 

Following is a sample output from the show interfacecounterscommand.

 

 

 

In total octets: 191520

 

 

 

In good unicast packets: 560

 

 

 

In good multicast packets: 0

 

 

 

In good broadcast packets: 0

 

 

 

In packets discarded: 0

 

 

 

In packets with CRC/Alignment error: 0

 

 

 

In undersized packets: 0

 

 

 

In oversized packets: 0

 

 

 

Out total octets: 0

 

 

 

Cisco Service Control Engine 1000 2xGBE Quick Start Guide

 

 

 

 

8-4

 

OL-7822-06

 

 

 

 

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Cisco Systems OL-7822-06 quick start Troubleshooting the link interface subsystem

OL-7822-06 specifications

Cisco Systems OL-7822-06 is a comprehensive course offered within the Cisco Networking Academy, designed to equip students and professionals with a deep understanding of basic networking concepts and advanced networking technologies. This course primarily focuses on the required skills and knowledge needed for building, running, and maintaining networks and prepares participants for various roles in the IT and cybersecurity sectors.

One of the main features of the OL-7822-06 course is its thorough curriculum, which covers key topics such as networking fundamentals, including OSI and TCP/IP models, IPv4 and IPv6 addressing, and subnetting. It dives deep into network protocols, ensuring learners acquire a firm grasp of how data flows across networks, as well as the role of routers and switches in maintaining efficient network operations.

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