When the TopN reports are ready, a syslog message is displayed that the TopN reports are available.
How switches learn MAC addresses | CCNA
You can use the show top interface report command to view the reports. You can display the TopN reports multiple times until you enter the clear top interface report command to clear the reports. Use the clear top interface report command to clear the reports. This example shows how to sort the TopN report based on the receive and transmit broadcast packets:. This example shows how to sort the TopN report based on the receive and transmit broadcast packets and specify the TopN sampling interval:.
To disable the ISL, use the no form of this command. Valid values on all platforms except the Cisco series are from 1 to On the Cisco series, valid values are from 1 to ISL encapsulation adds a byte header to the beginning of the Ethernet frame.
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- Configuring Port Security.
- Guidelines and Limitations!
To enter the subinterface configuration mode, you must enter the interface configuration mode first and then enter the interface command to specify a subinterface. Displays statistics for all interfaces configured on the router or access server. To enable IEEE Security association identifier. This value is used as the VLAN identifier. IEEE Interface configuration config-if Subinterface configuration config-subif. If the MAC access list permits the address, the software continues to process the packet.
If the access list denies the address, the software discards the packet and returns an Internet Control Message Protocol ICMP host unreachable message. On Catalyst series switches, this command is supported on Layer 2 ports only. Configures an IP access list to be used for packets transmitted from the asynchronous host. To access a subcommand to define extended MAC-access lists, use the mac access-list extended command in global configuration mode.
To remove MAC-access lists, use the no form of this command. Once you enter the mac access-list extended name command, use the following subset to create or delete entries in a MAC-access list:. Permits access if the conditions are matched. Optional Name or number of the protocol; see below for a list of valid values. When you enter the src-mac mask or dest-mac mask value, note these guidelines and restrictions:.
Use 1 bit as a wildcard. For example, to match an address exactly, use The first matching entry is used. To improve performance, place the most commonly used entries near the beginning of the access list. You cannot add entries to the middle of a list. An ACE created with the mac access-list extended command with the ip keyword filters malformed, invalid, deliberately corrupt EtherType 0x IP frames only; it does not filter any other IP traffic. To classify Layer 3 packets as Layer 2 packets, use the mac packet-classify command in interface configuration mode.
To return to the default settings, use the no form of this command. Microflow policing does not work on interfaces that have the mac packet-classify command enabled. Traffic is classified based on This example shows how to classify incoming and outgoing Layer 3 packets as Layer 2 packets:. To configure the maximum aging time for entries in the Layer 2 table, use the mac - address - table aging - time command in global configuration mode.
To reset maximum aging time to the default setting, use the no form of this command.
MAC address table entry maximum age. Valid values are 0, and from 5 to seconds. Aging time is counted from the last time that the switch detected the MAC address. The default value is seconds.
Clearing MAC address entries
Valid values are from 2 to The routed-mac keyword was added. The aging time entry will take the specified value. Valid entries are from 10 to seconds. To add dynamic addresses to the MAC address table, use the mac - address - table dynamic command in global configuration mode. Dynamic addresses are automatically added to the address table and dropped from it when they are not in use.
To remove dynamic entries from the MAC address table, use the no form of this command. Port to which packets destined for hw-address are forwarded. Optional Port interface number. The ranges are based on type of Ethernet switch network module used:. Optional Add dynamic addresses to the ATM module in slot 1 or 2.
1. Layer2 Technologies
The port is always 0 for an ATM interface. The interface and vlan parameters together specify a destination to which packets destined for hw - address are forwarded. The vlan keyword is optional if the port is a static-access or dynamic-access VLAN port. The vlan keyword is required for multi-VLAN and trunk ports. This keyword is required on trunk ports to specify to which VLAN the dynamic address is assigned.
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Valid IDs are 1 to ; do not enter leading zeroes. Optional The interface and vlan parameters together specify a destination to which packets destined for hw - address are forwarded. This command should be used only for testing purposes. Sets the length of time that a dynamic entry remains in the MAC address table after the entry is used or updated.
Table Of Contents
To enable MAC-address learning, use the mac-address-table learning command in global configuration mode. To disable learning, use the no form of this command. You can use the module num keyword and argument to specify supervisor engines or DFCs only. You can use the vlan vlan-id keyword and argument on switch-port VLANs only. You cannot use the vlan vlan-id keyword and argument to configure learning on routed interfaces. This example shows how to enable MAC-address learning on a switch-port interface on all modules:.
This example shows how to enable MAC-address learning on a switch-port interface on a specified module:. This example shows how to disable MAC-address learning on a specified switch-port interface for all modules:. This example shows how to enable MAC-address learning on a routed interface on all modules:.
This example shows how to enable MAC-address learning on a routed interface for a specific module:. This example shows how to disable MAC-address learning for all modules on a specific routed interface:. To enable MAC limiting, use the mac-address-table limit command in global configuration mode.
To disable MAC limiting, use the no form of this command. Optional Specifies the type of action to be taken when the action is violated. Optional Specifies that the one syslog message will be sent and no further action will be taken when the action is violated. Optional Specifies the type of notification to be sent when the action is violated. Use this syntax for enabling MAC limiting globally:.
Use this syntax for enabling per-port MAC limiting:. If you do not specify a maximum, an action, or a notification, the default settings are used. The flood keyword is supported on VLAN interfaces only.
The flood action occurs only if the limit action is configured and is violated. To send a notification of the dynamic changes to the MAC address table, use the mac-address-table notification change command in global configuration mode. Optional Sets the number of entries in the history buffer; valid values are from 0 to entries. Optional Sets the minimum change sending interval ; valid values are from 0 to seconds.