View the MAC address table on a Cisco switch
Switches maintain a database of MAC addresses, both manually configured (static) and dynamically learned entries. During troubleshooting, it may be helpful to investigate the entries in the MAC table.
To view the whole MAC table, use the following command from enable mode:
show mac-address-table
To list only the dynamically learned entries in the MAC table:
show mac-address-table dynamic
Also see ...
How to configure multiple Cisco switch ports at the same time
H3Using the following command will save you time when configuring multiple ports with the same characteristics./H3PTo configure multiple switchports at the same time we use the span style="font weight: bold"interface range/span configuration command. br /Example: br /Switch(config)int
H3Using the following command will save you time when configuring multiple ports with the same characteristics./H3PTo configure multiple switchports at the same time we use the span style="font weight: bold"interface range/span configuration command. br /Example: br /Switch(config)int
Configuring a root switch on IOS based Cisco switches
H3When we use spanning tree a root switch is elected but when it comes to troubleshooting a switched network knowing where the root switch is makes it much easier. Another reason for "manually choosing" a root switch is that we can use our most powerfull switch to become the root./H3PTo set t
H3When we use spanning tree a root switch is elected but when it comes to troubleshooting a switched network knowing where the root switch is makes it much easier. Another reason for "manually choosing" a root switch is that we can use our most powerfull switch to become the root./H3PTo set t
Enable Cisco Password Encryption
H3When setting a password against the console, auxiliary and vty lines on a cisco router, unless password encryption is switched on the passwords will be displayed when viewing the config on the terminal screen/H3Pdiv class="code"config terminal br /service password encryptionP br
H3When setting a password against the console, auxiliary and vty lines on a cisco router, unless password encryption is switched on the passwords will be displayed when viewing the config on the terminal screen/H3Pdiv class="code"config terminal br /service password encryptionP br
How to disable Cisco router domain name lookup
H3Ever foul up a command on a router or switch and have to sit there and wait for five minutes while it translates for the "domain" ?/H3PSimply enter global config mode and type br / br /router(config) span style="font weight: bold"no ip domain lookup/span br / br /There, no more
H3Ever foul up a command on a router or switch and have to sit there and wait for five minutes while it translates for the "domain" ?/H3PSimply enter global config mode and type br / br /router(config) span style="font weight: bold"no ip domain lookup/span br / br /There, no more
Changing an ACL on a Cisco Firewall
H3Although changing an ACL on a Firewall is almost exactly like a router, there are a couple nuances that people should know. Here are some tips and best practice material./H3P1. When you remove an access list, it is automatically removed from the interface. *This is a nice change from rout
H3Although changing an ACL on a Firewall is almost exactly like a router, there are a couple nuances that people should know. Here are some tips and best practice material./H3P1. When you remove an access list, it is automatically removed from the interface. *This is a nice change from rout