The show mac address-table exec command displays the contents of a switch’s MAC address table. Switch> enable Switch# Enter global configuration mode. This command lists all MAC addresses currently known by the switch. Desiree is a regular attendee of Cisco Live, B-Sides, and Defcon conferences. These commands are supported by the Output Interpreter tool for CatOS and can be used to assist in troubleshooting switch port or problems: show version, show module, show port, show counters, or show mac. Basic Cisco Commands By Marcus Nielson (2014) Configuring Basic Switch Settings (Switch Examples) Enter enable if the prompt has changed back to Switch>. Section 3 Troubleshooting Basic Connectivity 556 ... indicates commands that are manually input by the user (such as a show com- switches and the Cisco Unified Computing System. lab-6500-A#show interfaces fa 1/1 Cisco IOS Router Configuration Commands - Cheat Sheet (PDF) In a previous post, I have published a Cisco Switch Commands Cheat Sheet tutorial. Switch# configure terminal Enter configuration commands, one per line. With this step-by-step guide, you will learn the troubleshooting commands, and how to use them. Switch(config)#vtp mode server - Set the switch VTP mode to server Switch(config)#vtp mode client - Set the switch VTP mode to client Switch(config-if)#switchport mode trunk - Set a switch interface to trunk mode Switch#show vtp status - View the VTP status on a switch Switch#show spanning vlan 1 - Display the spanning tree information for VLAN 1 Although the main purpose of the switch is to provide inter-connectivity in Layer 2 for the connected devices of the network, there are myriad features and functionalities that can be configured on Cisco Switches. Filter the output with one of the following variations: show arp - Displays the IP-to-MAC associations. Configuring a switch is generally an easy task, but when things go wrong you need to know what to do. Cisco switches can be used as plug-and-play devices out of the box but they also offer an enormous amount of features. Switch(config)# Cisco Troubleshooting Cheatsheet Commonly-used Commands. Moreover, you will learn to find devices […] EXEC conf t config terminal priv. If you have the output of the supported commands from your Cisco device, you can use to display potential issues and fixes. Other Commands Comm and From Mode Func tion sdm pre dual def global config used if switch won't take IPv6 address General Commands Short Command Complete Command Func tion en enable user EXEC > priv. show mac address-table – See all MAC addresses known to the switch. Indeed, in this article, we jump-start you to switch troubleshooting on Cisco devices. Cisco Switch Troubleshooting Cheat Sheet show ip interface brief – See Layer 1, Layer 2, and Layer 3 interface status of all interfaces on the switch. Layer 2/Switch Port Details (Sample) show ip interfaces brief - Displays summarized layer 3 (routing) information. To know exactly how a particular switch will forward an Ethernet frame, you need to examine the MAC address table on a Cisco switch. Since these kinds of posts are useful as a reference for many people, I have decided to create also a Cisco Router Commands Cheat Sheet with the most useful and the most frequently used Command Line ‘cisco’ Switch(config)#line vty 0 4 Switch(config-line)#login Switch(config-line)#password cisco Enable and define console password of ‘cisco’ ... 10 commands Switch#show history Displays the ARP cache Switch#show arp Displays the spanning tree status on vlan 1 274 Chapter 7: Troubleshooting IP Routing The ping command lists various responses that in some cases imply that an unreachable message was received. Table 7-3 lists the various unreachable codes that may be displayed by the Cisco IOS Software ping command… End with CNTL/Z.
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