I do not have any Cisco experience so I have no clue on how to do this. I am using a Catalyst F. Any help would be greatly appreciated. Go to Solution. You obviously need to know the Port ID of the port you are trying to configure, so you need to know if it is Port 1 on the Switch or Port 26 for example. You should be able to get the exact port name from the command above.
How to configure and assign a Cisco switch access port to a VLAN
I have chosen Vlan 50 above but this needs to be the relevant Vlan ID you want to put the port into. View solution in original post. If you know how to and can access the device, can you list the configuration?
Can you "see" an existing port that's like what you want the new port to be? I do know how, and can logon to the device. However, that is the extent of my knowledge on this topic. If I knew how to list the configuration I would be able to determine an existing port, and what the new port should look like. Buy or Renew. Find A Community. We're here for you! Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for.
Search instead for. Did you mean:. Need to activate a port. Labels: Other Switching. I have this problem too. Accepted Solutions. Rising star. You obviously need to know. The following show command will list all the interfaces on the switch: show interface status You should be able to get the exact port name from the command above.
Joseph W. VIP Expert. Do you know how, and can you. Do you know how, and can you, logon to the device? Via the console or a telnet session? I do know how, and can logon. That worked perfectly. Thank you!
Cisco: All about errdisable (and how to enable ports disabled by it)
Latest Contents. Created by SammyAko on AM.This chapter describes how to configure port security on the Catalyst enterprise LAN switches. You can use port security to block input to an Ethernet, Fast Ethernet, or Gigabit Ethernet port when the MAC address of the station attempting to access the port is different from any of the MAC addresses that are specified for that port.
Alternatively, you can use port security to filter traffic that is destined to or received from a specific host that is based on the host MAC address.
The total number of MAC addresses that can be specified per port is limited to the global resource of plus 1 default MAC address. That is, the total number of MAC addresses on any port cannot exceed The maximum number of MAC addresses that you can allocate for each port depends on your network configuration.
The following combinations are valid allocations:. After you allocate the maximum number of MAC addresses on a port, you can either specify the secure MAC address for the port manually or have the port dynamically configure the MAC address of the connected devices. Out of a maximum allocated number of MAC addresses on a port, you can manually configure all, allow all to be autoconfigured, or configure some manually and allow the rest to be autoconfigured.
When you manually change the maximum number of MAC addresses that are associated to a port greater than the default value and then manually enter the authorized MAC addresses, any remaining MAC addresses are automatically configured.
For example, if you configure the port security for a port to have a maximum of ten MAC addresses but add only two MAC addresses, the next eight new source MAC addresses that are received on that port are added to the secured MAC address list for the port. After you allocate a maximum number of MAC addresses on a port, you can also specify how long the addresses on the port will remain secure. After the age time expires, the MAC addresses on the port become insecure.
By default, all addresses on a port are secured permanently. If a security violation occurs, you can configure the port to go either into shutdown mode or restrictive mode. The shutdown mode option allows you to specify whether the port is to be permanently disabled or disabled for only a specified time. The default is for the port to shut down permanently.
The restrictive mode allows you to configure the port to remain enabled during a security violation and drop only packets that are coming in from insecure hosts. Note If you configure a secure port in restrictive mode, and a station is connected to the port whose MAC address is already configured as a secure MAC address on another port on the switch, the port in restrictive mode shuts down instead of restricting traffic from that station.
When a secure port receives a packet, the source MAC address of the packet is compared to the list of secure source addresses that were manually configured or autoconfigured learned on the port. If a MAC address of a device that is attached to the port differs from the list of secure addresses, the port either shuts down permanently default modeshuts down for the time that you have specified, or drops incoming packets from the insecure host.
The behavior of a port depends on how you configure it to respond to a security violation. An SNMP trap is not sent if you configure the port for restrictive violation mode. A trap is sent only if you configure the port to shut down during a security violation. You can filter traffic based on a host MAC address, so that packets tagged with a specific source MAC address are discarded. When you specify a MAC address filter with the set cam filter command, incoming traffic from that host MAC address is dropped, and packets that are addressed to that host are not forwarded.
You cannot filter traffic for multicast addresses with this command. Note The set cam filter command allows filtering for unicast addresses only. You can block unicast flood packets on a secure Ethernet port by disabling the unicast flood feature. If you disable unicast flood on a port, the port will drop unicast flood packets when the port reaches the allowed maximum number of MAC addresses.
The port automatically restarts unicast flood packet learning when the number of MAC addresses drops below the maximum number that is allowed. Port security is either autoconfigured or enabled manually by specifying a MAC address.Errdisable is a feature that automatically disables a port on a Cisco Catalyst switch and is supported on most Catalyst switches running the Cisco IOS software.
The Errdisable error disable feature was designed to inform the administrator when there is a port problem or error. The reasons a catalyst switch can go into Errdisable mode and shutdown a port are many and include:. When a port is in error-disabled state, it is effectively shut down and no traffic is sent or received on that port.
How to Enable a Port on a Cisco Switch
The port LED is set to the orange color and, when you issue the show interfaces commandthe port status shows as Errdisabled. To enable err-disabled ports on Cisco switch series. Follow the below. Change the interface name to match your. In above example I had two e models in stack mode.
TIP: Link flap means that the specific port continuously goes up and down. The port is put into the errdisabled state if it flaps more than four-five times in few seconds.
The common cause of link flap is a Layer 1 issue such as a bad cable, duplex mismatch. Like Like.Cisco SG350 port configure
Comment by Germain — December 7, PM. Hello Everyone Assalamu alikum, I have a new problem at hand. If i Reboot my Mikrotik or change port then there is no Ping loss or getting good ping time for only 5 minute then again its starts to loss after every 20 replay. Comment by MD. Nahid — July 30, PM. Comment by qasim — November 6, PM. RSS feed for comments on this post. TrackBack URI. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account.
You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. Enter your email address to subscribe to this blog and receive notifications of new posts by email. Sign me up! Share this: Twitter Facebook. Like this: Like Loading Comments 5. Like Like Comment by MD.Need to enable a port on a Cisco switch? Look no further! To begin you need to know what the name of the port is that you want to enable on the switch.
This name or Port ID can be found by using the following command. Next, we need to enter privileged EXEC mode on the switch in order to issue the following commands. Now you can assign the selected port to a VLAN. Lastly, we want to bring this port interface up or enable it. To do use one of the following commands.
Your port should now be enabled and assigned to the VLAN you choose. You can to this to any other available port on your switch. If you would like to check on the status of the port interface that you just set up use the following commands. If you followed this example you will likely need to enter the exit command two times in a row.
Lastly, we can now show the status of the port interface you choose by entering the following command. We are going to stick with our example port for this command. This site uses Akismet to reduce spam. Learn how your comment data is processed. To do this, type one of the following commands. Exit config mode by performing one of the following methods. Use Ctrl-Z to exit configuration mode. Comments yeah! That worked for me. Leave a Reply Cancel reply Your email address will not be published.
OK Read more.Several types of passwords can be configured on a Cisco router, such as the enable password, the secret password for Telnet and SSH connections and the console port as well.
All these password locations represent good access locations for passwords, but if you have only one password on only one access location, you should at least have an enable password. The last several versions of the Cisco IOS for routers force you to set up passwords on the first boot if you have not already enabled passwords. This password gives you security on your router, because Privileged EXEC mode is where all the dangerous commands are located, including access to Global Configuration mode.
To set an enable password, use the following command:. This command creates an enable password that is stored in your configuration file. To view this password, show the running configuration using the following command:. You may immediately see the problem here. The password is stored in plain text in your configuration file, thus anyone who has access to your configuration file can easily read the password.
When you configure both an enable and a secret password, the secret password is the password that will be used to switch from User Exec mode to Priv Exec mode. The following code sets both passwords for your router:. Most encrypted passwords in your configuration file use a weak reversible encryption and are identified by a 7 in the password line, whereas the secret password is encrypted with a one-way MD5 hash with a 5 denoted in the password line.
You may also see a 0, which identifies it as an unencrypted password. Cisco Router Passwords: Enable and Secret. About the Book Author Edward Tetz has worked with computers as a sales associate, support tech, trainer, and consultant.This article describes how to configure switch port security on Cisco Switches.
It provides guidelines, procedures, and configuration examples. To practice and learn to configure port security on Cisco switch, just download the port security packet tracer lab or create your own lab and follow the switch port security configuration guideline.
In this activity, you will configure and verify port security on a switch. Secure the ports so that the MAC address of a device is dynamically learned and added to the running configuration.
Disable all the remaining unused ports. Hint: Use the range keyword to apply this configuration to all the ports simultaneously. Try to test your switch port security configuration with ping command and testing with the rogue laptop on the lab. If you need to study more about switch port security, try to read a book or simply read the below materials.
You can configure MAC addresses to be sticky. These can be dynamically learned or manually configured, stored in the address table, and added to the running configuration. If these addresses are saved in the configuration file, the interface does not need to dynamically relearn them when the switch restarts.
Although sticky secure addresses can be manually configured, it is not recommended. When you enter this command, the interface converts all the dynamic secure MAC addresses, including those that were dynamically learned before sticky learning was enabled, to sticky secure MAC addresses.
If you save the sticky secure MAC addresses in the configuration file, when the switch restarts, the interface does not need to relearn these addresses. If you do not save the configuration, they are lost. If sticky learning is disabled, the sticky secure MAC addresses are converted to dynamic secure addresses and are removed from the running configuration. After the maximum number of secure MAC addresses is configured, they are stored in an address table.
To ensure that an attached device has the full bandwidth of the port, configure the MAC address of the attached device and set the maximum number of addresses to one, which is the default.
A security violation occurs if the maximum number of secure MAC addresses has been added to the address table and a workstation whose MAC address is not in the address table attempts to access the interface. You can configure the interface for one of these violation modes, based on the action to be taken if a violation occurs:. Source: Cisco. An IT Pro, here is my online knowledge sharing platform.
A secure port cannot be a trunk port. A secure port cannot belong to an EtherCha nnel port-channel interface. A secure port and static MAC address configuration are mutually exclusive.
Part 1: Configure Port Security a. SW1 config-if-range switchport port-security maximum 1 SW1 config-if-range c. SW1 config-if-range switchport port-security mac-address sticky SW1 config-if-range d.
SW1 config-if-range switchport port-security violation restrict SW1 config-if-range e.Trunks are required to carry VLAN traffic from one switch to another. Above you see a topology with a computer connected to each switch. The next step is to create a trunk between the two switches.
Technically the interfaces between the two switches can also be in access mode right now because I only have a single VLAN. I try to change the interface to trunk mode with the switchport mode trunk command. Depending on the switch model you might see the same error as me. If we want to change the interface to trunk mode we need to change the trunk encapsulation type.
This is where you can choose between By default our switch will negotiate about the trunk encapsulation type. Does this mean we are done? Not quite yet…there is more I want to show to you:. This is completely normal because the show vlan command only shows interfaces in access mode and no trunk interfaces.
The show interface trunk command is very useful. You can see if an interface is in trunk mode, which trunk encapsulation protocol it is using We can also see that VLAN 1 — are allowed on this trunk. Last but not least you can see something which VLANs are in the forwarding state for spanning-tree. An interface can be in access mode or in trunk mode. This is our trunk interface which is connected to SW1. You can see the operational mode is trunk mode. If I go to the interface configuration to change the switchport mode you can see I have more options than access or trunk mode.
There is also a dynamic method. We can choose between dynamic auto and dynamic desirable. Our switch will automatically find out if the interface should become an access or trunk port.
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