Cisco network troubleshooting commands pdf

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Cisco network troubleshooting commands pdf

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 Interface CLI configuration commands for Cisco Routers.

Cisco IOS routers are probably the most complete, versatile and feature-rich networking devices. There are whole books written about Cisco router configurations and commands. However, the list below I believe summarizes the most important ones so its a good starting point for a networking professional. We use Elastic Email as our marketing automation service.

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Although there is a wide range of Cisco router models, the commands below will work on most devices running IOS with no problems. Make sure to download the cheat sheet in PDF format for future reference by subscribing above. Router show flash:. Router show ip protocols. Router show ip route. Router show history. Router show tech-support. MyRouter config enable secret test1. MyRouter config-if clock rate MyRouter config-if no shut.

For static route, default is 1]. MyRouter config ip route 0. MyRouter config router rip. MyRouter config-router version 2. Version 1 is default]. MyRouter config-router auto-summary.

All routers should be in the same AS to build a neighbor relationship. Shows feasible successors]. MyRouter config router ospf 10 MyRouter config-router area 0 authentication.

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MyRouter config router ospf 10 MyRouter config-router area 0 authentication message-digest.Troubleshooting is about three big things: predicting what can happen, determining the anomaliesand investigating why that anomalies happened.

Many network admins break down network infrastructure problems by analyzing the Layer 3 path through the network, hop by hop, in both directions. This process helps them isolate the problem; once they determine which hop in the layer path fails, they can then look further into the details.

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There are various tools that can help with network troubleshooting. The Cisco Discovery Protocol CDP discovers basic information about neighbor routers and switches without needing to know the passwords for those Cisco network devices. This is possible because Cisco routers and switches routinely send out CDP messages that announce information about themselves. Therefore, Cisco hardware that supports CDP can learn about other devices by listening for these messages. CDP discovers several useful details from neighboring Cisco devices:.

This command lists each neighboring device, one per line. This interface command also lists the platform, identifying the specific model of the neighboring router or switch. To get additional details, such as the full name of the model of switch and the IP address configured on the neighboring device, add the detail parameter as follows:. Of course, being able to discover a lot of information about neighboring devices is a network security exposure.

To toggle CDP off and on for an entire device, use the no cdp run and cdp run global commands.

Basic Cisco Router commands

To toggle it on a specific interface, use the no cdp enable and cdp enable interface subcommands. It outputs the following information:.

The basic purpose for ping is to check for reachability, round trip time RTT and packet loss. In order to troubleshoot a device for these properties, we need to use specify the IP address of the device — for example, ping You can ping from the particular interface by adding the source parameter with the interface name at the end of the command — for example, ping Traceroute is a function that traces the path from one network to another, so it can help diagnose the source of many problems.

Then traceroute sends a set of three UDP datagrams with TTL 2, so they time out when they hit the second router, causing it to responds with timeout message. You can also use an extended traceroute command to test connectivity from a specified source — for example, traceroute The basic CLI commands for all of them are the same, which simplifies Cisco device management.

Here is a Cisco commands cheat sheet that describes the basic commands for configuring, securing and troubleshooting Cisco network devices. Please note that it is recommended to turn JavaScript on for proper working of the Netwrix website. Go Up. Cisco Commands Cheat Sheet.

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The access port is set to access unconditionally and operates as a non-trunking, single VLAN interface that sends and receives non-encapsulated non-tagged frames. An access port can be assigned to only one VLAN. The trunk port sends and receives encapsulated tagged frames that identify the VLAN of origination. A trunk is a point-to-point link between two switches or between a switch and a router. In this mode, the switch supports simultaneous tagged and untagged traffic on a port.

Both values can be specified in a single command to allow both Telnet and SSH access default settings. Specify the number or name of the desired severity level at which messages should be logged. Previous Best Practice. Next Best Practice. User Termination Best Practices. Privileged Account Management Best Practices. Network Security Best Practices.

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Cisco Commands Cheat Sheet

Okay, got it. An enable mode command that saves the active config, replacing the startup config when a Cisco network device initializes. Used in interface configuration mode. An interface mode command that manually sets the speed to the specified value or negotiates it automatically.

cisco network troubleshooting commands pdf

Displays a large variety of configuration settings and current operational status, including VLAN trunking details. Lists information about the currently operational trunks and the VLANs supported by those trunks. In router configuration mode, configures the software to receive and send only RIP version 2 packets.Cisco switches can be used as plug-and-play devices out of the box but they also offer an enormous amount of features.

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. In the following Cisco Switch Commands Cheat Sheet, I have tried to include the most important and frequently-used CLI commands that Cisco professionals encounter in real world networks.

I know that the list is not exhaustive but I believe that the most useful commands are included.

cisco network troubleshooting commands pdf

Make sure to download the whole commands cheat sheet in PDF format below so you can print it or save it on your computer for future reference. We use Elastic Email as our marketing automation service. By submitting this form, you agree that the information you provide will be transferred to Elastic Email for processing in accordance with their Terms of Use and Privacy Policy.

Also, you allow me to send you informational and marketing emails from time-to-time. Cisco Router Commands Cheat Sheet. The following commands will work on most Cisco switch models such as, etc.

MySwitch config enable secret test1. MySwitch config line con 0. MySwitch config-line login. MySwitch config line vty 0 4. MySwitch show port-security.

cisco network troubleshooting commands pdf

Use it only if you connect a regular host e. Do not use this command when the port is trunk or if you connect other switches on the specific port. MySwitch config vlan MySwitch config-vlan name testvlan.

MySwitch show vlan brief. MySwitch config-if switchport mode access. MySwitch config-if switchport access vlan The following commands will select a range of interfaces from 1 to 24 and add all of them to vlan MySwitch config-if switchport mode trunk. One topic I would like to see you cover is hair pinning, from the aspect of vpn client connecting into HO ASA but hair pinning through site-to-site to remote office resource.Samford (Spread)North Dakota vs.

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Cisco Router Configuration Commands – CLI Cheat Sheet

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Cisco Switch Commands Cheat Sheet (CLI)

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