To configure a static MAC address on a service instance, use the mac static address command in service instance configuration mode. Router(config-bdomain)# mac limit maximum addresses 1000
#CISCO MAC ADDRESS TABLEHISTORY HOW TO#
The following example shows how to set the maximum number of MAC addresses on a specific bridge domain to 1000: Maximum number of MAC addresses are allowed on the bridge domain. Integer that specifies the maximum number of MAC addresses allowed on a bridge domain. No mac limit maximum addresses maximum-addresses Syntax Description maximum-addresses Mac limit maximum addresses maximum-addresses To return to the default state, use the no form of this command. To configure the maximum number of MAC addresses allowed on a bridge domain, use the mac limit maximum addresses command in bridge domain configuration mode. Router(config-bdomain)# end Related Commands CommandĬonfigures a static MAC address on a service instance.Ĭonfigures the maximum number of MAC addresses allowed on a bridge domain. The following example shows how to disable MAC learning on a bridge domain: The following example shows how to reenable MAC learning on a bridge domain: MAC address learning is enabled by default only for point–to–multipoint bridge domains and can also be disabled. Command Modesīridge domain configuration (config-bdomain) Command History Release MAC learning is enabled on the bridge domains by default. This command has no arguments or keywords. To disable MAC learning, use the no form of this command. To reenable MAC learning on the bridge domain, use the mac learning command in bridge domain configuration mode. Router# clear mac-address-table address Related Commands Commandĭisplays information about the MAC address table. The following example shows how to remove a MAC address from the MAC address table on all the bridge domains: The following example shows how to remove a MAC address from the MAC address table on a bridge domain:Ġ interface TenGigabitEthernet 4/1 bridge-domain 100 If you specify an interface but do not specify an address, all the addresses on the specified interface are removed. If you specify an address but do not specify an interface, the address is deleted from all the interfaces. If the clear mac-address-table command is used without options, all the MAC addresses are removed. Privileged EXEC (#) Command History Release When no options are specified, all the dynamically added MAC addresses are cleared. (Optional) Clears the MAC address from the specified interface. (Optional) Clears the MAC address from the specified bridge domain. (Optional) Specifies the MAC address to clear. To remove a specified address (or set of addresses) from the MAC address table, use the clear mac-address-table command in privileged EXEC mode.Ĭlear mac-address-table Syntax Description address mac-addr (ETA: What if you can't get to the Console port? How do you get the IP address of the switch in order to SSH or (if you must) Telnet in?)Ĭouldn't you just use CDP? #show cdp nei detail will show you the ip of the connected devices.This chapter describes commands to configure MAC learning. The amazing thing to me is, this far into the 21st Century, this is still the only way I could find to get this information - i.e. Also, 'sh ip arp | i 0/24' will show just the MAC address(es) on that port.) If you're all Cisco, 'show cdp neighbor' (or 'sh cdp nei') will get you to the next switch. (Small tip: When you see a large number of MAC addresses showing up on a single port, there's a switch on that port into which those MAC addresses are connected. It helps to Ping the subnet's broadcast address (e.g.
:^D After beating Google to death over it, hoping for some useful tool, I ended up using exactly the same process (plus the online MAC address lookup to ID the device manufacturer), so I can affirm this works perfectly, if you work it.Īs you can see, the 'sh arp' or 'sh ip arp' commands also give you the MAC addresses, so essentially the 'sh mac add' is only to get the port in which the device is connected. Thanks for posting this *after* I finished a "What's Connected Where" jihad on our network.
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