- How to use HyperTerminal Terminal Emulator to configure, monitor or manage a Cisco Router or Switch
- Monitoring traffic with Cisco port monitoring.
- Monitoring traffic with Cisco port monitoring.
- terminal monitor
- How to see console output on a Cisco SSH session?
How to use HyperTerminal Terminal Emulator to configure, monitor or manage a Cisco Router or SwitchTo use commands of this module, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using any command, contact your AAA administrator for assistance. To specify the length of time that logs are maintained in the logging archive, use the archive-length command in logging archive configuration mode. To return to the default, use the no form of this command. Length of time in weeks that logs are maintained in the archive. Range is 0 to Use the archive-length command to specify the maximum number of weeks that the archive logs are maintained in the archive. Any logs older than this number are automatically removed from the archive. This example shows how to set the log archival period to 6 weeks:. To specify the amount of space allotted for syslogs on a device, use the archive-size command in logging archive configuration mode. Amount of space in MB allotted for syslogs. The range is 0 to Use the archive-length command to specify the maximum total size of the syslog archives on a storage device. If the size is exceeded, then the oldest file in the archive is deleted to make space for new logs. This example shows how to set the allotted space for syslogs to 50 MB:. To clear system logging syslog messages from the logging buffer, use the clear logging command in EXEC mode. EXEC mode. Use the clear logging command to empty the contents of the logging buffer. When the logging buffer becomes full, new logged messages overwrite old messages. Use the logging buffered command to specify the logging buffer as a destination for syslog messages, set the size of the logging buffer, and limit syslog messages sent to the logging buffer based on severity. Use the show logging command to display syslog messages stored in the logging buffer. Specifies the logging buffer as a destination for syslog messages, sets the size of the logging buffer, and limits syslog messages sent to the logging buffer based on severity. Displays syslog messages stored in the logging buffer. To specify the device to be used for logging syslogs, use the device command in logging archive configuration mode. Use the device command to specify where syslogs are logged. If the device is not configured, then all other logging archive configurations are rejected. Similarly, the configured device cannot be removed until the other logging archive configurations are removed. It is recommended that the syslogs be archived to the harddisk because it has more capacity. This example shows how to specify disk1 as the device for logging syslog messages:. To create a syslog message discriminator, use the discriminator command in Global Configuration mode. To disable the syslog message discriminator, use the no form of this command. Specifies the first match keyword to filter the syslog messages. Specifies the second match keyword to filter the syslog messages. Specifies the third match keyword to filter the syslog messages. Specifies the first keyword that does not match the syslog messages. Specifies the second keyword that does not match the syslog messages. Specifies the third keyword that does not match the syslog messages. A string when matched in the syslog message, is included as the discriminator. If the pattern contains spaces, you must enclose it in quotes " ".
Monitoring traffic with Cisco port monitoring.
As I've began learning Cisco networking, there is one feature that I've fallen in love with -- the Port Monitor. Essentially, you can take whatever ports you want and "mirror" them to another, allowing the computer at the other end to receive traffic not originally intended for it much like how a hub operates. If you are going to do this, I recommend you actually read up about it at Cisco's site. I know my way around it, but truth be told, I have little experience thus far in Cisco. In these examples, I am using a Cisco series layer 2 switch. Your results may vary, but I know these are correct for the series. The hostname of the switch is Rohan. You should know how to do this by yourself. If you have any questions on doing this, bug your higher-up system admin. Once connected, type "ena" to enter enable mode. You will be asked for the enable accounts password. Type it in. Choose which interface you want your traffic mirrored to. Here comes the fun part. You can either specify to monitor a single vlan the monitor port must be on the same vlan as the ports it is monitoring! You should see: Rohan Type "wr" to save your current running configuration as your startup config so you don't lose all your hard work after a reboot. You should see traffic from all of the ports you specified get mirrored to your current machine. If not, recheck your steps. Having a monitor port has proven beyond useful when it comes to debugging problems at the network level or catching people trying to torrent Their also fun to just watch what your computer is doing. Idea: Plug the monitor port into a server running RemoteApp and set Wireshark up as an app that only Domain Admins can run. That way, anywhere you are on the network, you can see exactly whats going no matter where you are. Thanks for the walk through. I just happen to have a series sitting on a bookshelf collecting dust. Might as well collect data. I have two series linked, is it possible to monitor the whole Vlan both switches via a port on just one? Ashley; You should be able to. I'm not sure how the guy did it, but prior to me taking over at Bates for networking, the prior Cisco tech had set up a vlan for every room in the building and a single monitor port that can capture traffic from every vlan. I've looked at his config, but its freaking huge and based off a
Monitoring traffic with Cisco port monitoring.
Syntax Description session-number. Optional Specifies that the selected session will be shut down for monitoring. Command Default None. Command Modes Global configuration mode. Command History Release. Limit on the number of egress TX sources in a monitor session has been lifted. Usage Guidelines To ensure that you are working with a completely new session, you can clear the desired session number or all SPAN sessions. When you configure more than two SPAN sessions, the first two sessions are active. During startup, the order of active sessions is reversed; the last two sessions are active. For example, if you configured ten sessions 1 to 10 where 1 and 2 are active, after a reboot, sessions 9 and 10 will be active. To enable deterministic behavior, explicitly suspend the sessions 3 to 10 with the monitor session session-number shut command. Port-channel interfaces can be configured as egress sources. Related Commands Command. SPAN session to create or configure. The range is from 1 to Specifies to apply configuration information to all SPAN sessions. Optional Specifies the type of session to configure. Adds a description to identify the SPAN session. Displays SPAN session configuration information.
Lets cover this syntax so that you can speak the same language as me. Except me. But not today. A VTY is term used by Cisco to describe a single terminal whereas Terminal is more of a verb or general action term. The following is conjecture on my part, I have no actual proof that this is true but it seems highly likely. Teletype refers to the days when computers were programmed by character based printers, literally, a keyboard attached to a printer. When you pressed a key, the character was printed on paper. Screen to display characters were invented much later. I guess Cisco never got around to changing it. Is that just cheap or good for customers, hard to say. If you made a mistake you had to delete the entire line, type it again and hope it was right. Terry Slattery talks about it here. Here is an excerpt:. He told me that he needed the ability to change the configuration at a trade show, so he added a quick hack to allow him to type the configuration into a buffer, which was passed to the function that parsed the TFTP file. You entered all the commands and when you pressed CTRL-Z, the file was parsed and any errors were displayed. Greg Satz, who told me of this change, was pleased to note that I had just barely noticed the change. The change reported errors as soon as you entered them, not after the entire buffer had been typed, so it was a good change. This change would have happened sometime before late There was still no command history, interactive help, or command editing capability. If you configure more, you can depending on IOS version have more. Using different terms can cause errors and mistakes. Get over it. Network Break is round table podcast on news, views and industry events. Join Ethan, Drew and myself as we talk about what happened this week in networking. In the time it takes to have a coffee. Email address:. Syntax Herewith is the official Ethereal Mind definition for each term. Do not use any other meaning. Then we all mean the same thing. Footnote: Apocryphal Note on VTY for younger people The following is conjecture on my part, I have no actual proof that this is true but it seems highly likely. A teletype! Are you kidding? There was still no command history, interactive help, or command editing capability Which vty am I connected to? Network Break Podcast Network Break is round table podcast on news, views and industry events.