Clear mac address table dynamic multicast entries

This will affect the switch operation performance. If aging time is too long, the switch will store a great number of out-of-date MAC address tables. This will consume MAC address table resources and the switch will not be able to update MAC address table according to the network change. The aging of dynamic MAC address is completed during the second aging cycle that has been configured.

Configure the entry aging time of Layer 2 dynamic address table to be seconds. The valid value range for this argument is 1 to The aggregation group here cannot be a dynamic aggregation group. Use the mac-limit command to assign a MAC address to an aggregation group. Use the undo mac-limit command to remove the binding between a MAC address and an aggregation group.

After a MAC address is assigned to an aggregation group, the MAC address can only be learned in this aggregation group. By default, no MAC address is assigned to any aggregation group. Otherwise, this command only removes the specified binding. Assign MAC address to aggregation group 1. Use the reset mac - address command to clear MAC address entries. Related commands: mac-address , display mac-address aging time.

Use the source-mac command to set a source MAC address for the port. Use the undo source-mac command to remove the source MAC address setting. When a packet is forwarded through the port, the least significant byte of the source MAC address of the packet is the corresponding byte of the source MAC address set for the port.


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Display all static multicast MAC address group information. Table Description on the fields of the display mac-address multicast static command. Use the mac-address multicast command to add multiple ports to a static multicast MAC address group. Use the undo mac-address multicast command to remove the static multicast MAC address group or the ports from the static multicast MAC address group.

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Related commands: display mac-address multicast static. Use the reset mac-address multicast command to clear all static multicast MAC address groups. A protected port continues to forward and receive unicast, multicast, and broadcast traffic to and from unprotected ports. The port protection feature is local to the switch; communication between protected ports on the same switch is possible only through a Layer 3 device. To prevent communication between protected ports on different switches, you must configure the protected ports for unique VLANs on each switch and configure a trunk link between the switches.

You can verify the previous command by entering the show port protected user EXEC command. Related Commands Command Description show port protected. Use the port security interface configuration command to enable port security on a port and restrict the use of the port to a user-defined group of stations. Optional The maximum number of secure addresses that this port can support.

If you specify trap , use the snmp-server host global configuration command to configure the SNMP trap host to receive traps. This example shows how to enable port security and what action the port takes in case of an address violation shutdown. You can verify the previous commands by entering the show port security privileged EXEC command. Related Commands Command Description show port security. Use the port storm-control interface configuration command to enable broadcast, multicast, or unicast storm control on a port. Use the no form of this command to disable storm control or one of the storm-control parameters on the port.

The rising-number is 0 to packets per second. Traps are generated only for broadcast traffic and not for unicast or multicast traffic. The rising thresholds are broadcast packets per second, multicast packets per second, and unicast packets per second.

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The falling thresholds are broadcast packets per second, multicast packets per second, and unicast packets per second. This example shows how to enable broadcast storm control on a port. In this example, transmission is inhibited when the number of broadcast packets arriving on the port reaches and is restarted when the number drops to You can verify the previous command by entering the show port storm-control user EXEC command.

Related Commands Command Description show port storm-control. Use the power inline interface configuration command to determine how inline power is applied to the device on the specified Fast Ethernet port of the PWR-XL switch. Use the no form of this command to return the setting to its default. Syntax Description auto. You can verify the previous command by entering the show power inline privileged EXEC command.

Related Commands Command Description show power inline. Determines how the telephone connected to the specified port handles priority traffic received on its incoming port. Use the rcommand user EXEC command to start a Telnet session and to enter commands on a member switch from the command switch. To end the session, enter the exit command. If the switch is the command switch but the member switch n does not exist, an error message appears.

To obtain the switch number, enter the show cluster members privileged EXEC command from the command switch. You can use this command to access a member switch from the command-switch prompt or to access a command switch from the member-switch prompt. For example, if you enter this command at user level on the cluster command switch, the member switch is accessed at user level. If you use this command on the command switch at privileged level, the command accesses the remote device at privileged level.

If you use an intermediate enable-level lower than privileged , access to the member switch is at user level. If the command switch is at privilege level 1, you are prompted for the password before being able to access the menu console. Command switch privilege levels map to the member switches running standard edition software as follows:.

If the command switch privilege level is 15, the member switch is accessed at privilege level This command does not work if the vty lines of the command switch have access-class configurations. You are not prompted for a password because the member switches inherited the password of the command switch when they joined the cluster. This example shows how to start a session with member 3. All subsequent commands are directed to member 3 until you enter the exit command or close the session. Related Commands Command Description show cluster members. This command resets the proposed database to the currently implemented VLAN database on the switch.

You can verify the previous command by entering the show changes and show proposed VLAN database commands. Use the rmon collection stats interface configuration command to collect Ethernet group statistics. The Ethernet group statistics include utilization statistics about broadcast and multicast packets, and error statistics about Cyclic Redundancy Check CRC alignment errors and collisions. Use the no form of this command to return to the default setting. Syntax Description index. You can verify this command by entering the show rmon statistics command in user EXEC mode.

Related Commands Command Description show rmon statistics. Enter the exit command, or press Ctrl-G to return to the switch command-line interface. Related Commands Command Description exit. Syntax Description state. Optional Display all known multicast groups and the destination ports. Limited to given VLAN if vlan keyword is entered; limited to a specific group if the address variable is entered.

The address is the MAC address of the group. Optional Display all routers, their ports, and expiration times. Limited to a given VLAN if the vlan keyword entered; limited to a specific router if the address variable is entered. The address is the MAC address of the router. If show cgmp is entered with no arguments, all information appears. Enables CGMP. Also enables and disables the Fast Leave parameter and sets the router port aging time. You can also display the differences between the two for a selected VLAN.

Syntax Description vlan-id. If this variable is omitted, all the differences between the two VLAN databases are displayed, including the pruning state and Version 2 mode. This is an example of output from the show changes command. It displays the differences between the current and proposed databases. This is an example of output from the show changes 7 command. It displays the differences between VLAN 7 in the current and proposed database.

Related Commands Command Description show current. Use the show cluster user EXEC command to display the cluster status and a summary of the cluster to which the switch belongs. This command can be entered on command and member switches. If the switch is not a command switch or a member switch, the command displays an empty line at the prompt. On a member switch, this command displays the identity of the command switch, the switch member number, and the state of its connectivity with the command switch.

On a command switch, this command displays the cluster name and the number of members. It also shows the cluster status and length of time since the status changed. If redundancy is enabled, it displays the primary and secondary command-switch information. If you enter this command on a switch that is not a cluster member, the error message Not a management cluster member appears. This is an example of output when this command is entered on a member switch that is configured as the standby command switch:.

This is an example of output when this command is entered on the command switch that is separated from member This is an example of output when this command is entered on a member switch that is separated from the command switch:. Enables a command-capable switch as the cluster command switch, assigns a cluster name, and optionally assigns a member number to it.

Use the show cluster candidates user EXEC command on the command switch to display a list of candidate switches. Syntax Description mac-address H. The SN in the display means switch member number. If E appears in the SN column, it means that the switch is discovered through extended discovery. The hop count is the number of devices that the candidate is from the command switch. This is an example of output from the show cluster candidates command that uses the MAC address of a member switch directly connected to the command switch:.

This is an example of output from the show cluster candidates command that uses the MAC address of a member switch three hops from the cluster edge:. Use the show cluster members user EXEC command on the command switch to display information about the cluster members. This is an example of output from the show cluster members command. The SN in the display means switch number. Use the show controllers ethernet-controller privileged EXEC command to display the Ethernet link transmit and receive statistics on a Fast Ethernet switch. Using the show controllers ethernet-controller command without specifying a Fast Ethernet port displays the Ethernet link statistics of all ports on the switch.

The output shows the internal switch statistics. This is an example of output from the show controllers ethernet-controller command on Fast Ethernet port Related Commands Command Description clear controllers ethernet-controller. If this variable is omitted, the entire VLAN database displays, included the pruning state and Version 2 mode. This is an example of output from the show current command. It displays the current VLAN database. This is an example of output from the show current 2 command. It displays only VLAN 2 of the current database. Related Commands Command Description show changes.

Use the show diags user EXEC command to display the state of a port or all ports on the switch. Syntax Description addr-move. Use the show diags command without specifying a port to show the state of all ports on the switch. Use the show diags link-flap command to check if link flapping on a port is occurring.

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Link flapping can be caused by a loose connection to a port or by numerous changes to a port connection. Use the show diags addr-move command to check if address flapping is occurring. The address table keeps changing because the MAC address is first learned on one interface, is learned on another interface, and then relearned on the previous interface, and so on. Syntax Description all. Use the show file systems privileged EXEC command to display file system information.

Use the show interface privileged EXEC command to display the administrative and operational status of a switching nonrouting port. The display shows two values separated by a comma. The first value is the value that you configured by using the flowcontrol command or the Cluster Management Suite CMS or the default value if you did not configure it.

The first value can be one of these settings:. The second value represents the flow control value that is autonegotiated with the link partner and can be one of these settings:. Table describes each field in the display. Displays the administrative and operational status of the port. In this display, the port is in switch port mode. Displays the administrative and operational encapsulation method. Also displays whether trunking negotiation is enabled.

Lists the allowed VLANs on the trunk. Lists the active VLANs on the trunk. Displays how the appliance telephone connected to the specified port handles priority traffic that is received on its incoming port. Related Commands Command Description switchport access. Expressions are case sensitive.

Let The Switch Do The Work Dynamic MAC Address Table Entries

Related Commands Command Description ip igmp filter. Use 1 or 2 for the slot number. Use 0 as the port number. The self , aging-time , count , and vlan vlan-id keywords were added. This command displays the MAC address table for the switch. Specific views can be defined by using the optional keywords and values. If more than one optional keyword is used, then all of the conditions must be true in order for that entry to be displayed.

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Use the show mac-address-table notification privileged EXEC command to display the global parameters for the MAC address notification feature. Syntax Description interface interface-id. Use the show mac-address-table notification command without keywords to display parameters for all interfaces. Use this command with the interface keyword to display parameters for a specific interface. This is an example of output from the show mac-address-table notification command:. This is an example of output from the show mac-address-table notification interface command for all interfaces on a switch:.

This is an example of output from the show mac-address-table notification interface interface-id command for one interface on a switch:. Related Commands Command Description clear mac-address-table notification. Related Commands Command Description show mvr interface. Displays the configured MVR interfaces or displays the multicast groups to which a receiver port belongs. Use the command with keywords to display MVR parameters for a specific receiver port.

If the entered port identification is a non-MVR port or a source port, the command returns an error message.

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For receiver ports, it displays the port type and per port parameters, such as maximum threshold and Immediate Leave setting. Related Commands Command Description show mvr. Use the show mvr members privileged EXEC command to display all receiver ports that are members of an IP multicast group. Optional The IP multicast address. If the address is entered, all receiver ports that are members of the multicast group are displayed. If no address is entered, all members of all MVR groups are listed. The show mvr members command only applies to receiver ports. All source ports are members of all multicast groups.

Use the show port block privileged EXEC command to display the blocking of unicast or multicast flooding to a port. If the variable interface is omitted, the show port block unicast and show port block multicast commands display packet blocking information on all ports. Related Commands Command Description port block. Use the show port group privileged EXEC command to display the ports that belong to a port group.

If the variable group-number is omitted, the show port group command displays all port groups on the switch. Related Commands Command Description port group. If the variable interface is omitted, the show port monitor command displays all monitor ports on the switch. Related Commands Command Description port monitor. If the variable interface is omitted, the show port network command displays all network ports on the switch.

Related Commands Command Description port network. Defines a port as the switch network port. Use the show port protected privileged EXEC command to display the port protected mode for all ports. Related Commands Command Description port protected. Isolates unicast, multicast, and broadcast traffic at Layer 2 from other protected ports on the same switch.

Use the show port security privileged EXEC command to display the port security settings defined for the port. If the variable interface is omitted, the show port security command displays all secure ports on the switch. Related Commands Command Description port security. Use the show port storm-control privileged EXEC command to display the packet-storm control information. This command also displays the action that the switch takes when the thresholds are reached.

If the variable interface is omitted, the show port storm-control command displays storm control settings on all ports on the switch. You can display broadcast, multicast, or unicast packet-storm information by using the corresponding keyword. Related Commands Command Description port storm-control. Optional Display the current power status, which might not be the same as the configured power. Related Commands Command Description power inline. If the variable vlan-id is omitted, the show proposed command displays the entire proposed VLAN database. The proposed VLAN database is not the running configuration until you use the exit or apply command.

This is an example of output from the show rps command. Table describes the possible display output. The RPS is connected, operational, and in standby mode. The switch is operating from its own internal power supply. The RPS is connected but not operating correctly faulty. Use the show spanning-tree user EXEC command to display spanning-tree information for the specified spanning-tree instances. Syntax Description brief. Optional List of spanning-tree instances. Ranges are not supported. List of ports for which spanning-tree information appears. Enter each port separated by a space.

If the variable stp-list is omitted, the command applies to the spanning-tree instance associated with VLAN 1. Related Commands Command Description spanning-tree. Configures a port priority, which is used when two switches tie for position as the root switch. Table describes the fields in this display. How UDLD is configured on the port. If UDLD is enabled or disabled, the port enable configuration setting is the same as operational enable state. Otherwise, the enable operational setting depends on the global enable setting. The bidirectional state of the link. An unknown state appears if the link is down or if it is connected to an UDLD-incapable device.

A bidirectional state appears if the link is a normal two-way connection to a UDLD-capable device. All other values mean miswiring. The length of time before the next advertisement is sent from the local device. Measured in seconds. The current phase of the UDLD state machine.

For a normal bidirectional link, the state machine is usually in the Advertisement phase. The time period, in seconds, that UDLD waits for echoes from a neighbor device during the detection window. The remaining time in seconds in the detection window. This setting is meaningful only if UDLD is in the detection phase. The number of neighbors detected.

For point-to-point links, this value should always be one. It is greater than one only when the port is connected to a hub. The remaining number of probe messages to send in the detection window. Information from the first cache entry, which contains a copy of echo information received from the neighbor. The neighbor's current state. If both the local and neighbor devices are running UDLD normally, the neighbor state and local state should be bidirectional. If the link is down or the neighbor is not UDLD-capable, no cache entries are displayed. Related Commands Command Description udld.

Use the show version user EXEC command to display version information for the hardware and firmware. This is an example of output from the show vlan id 6 or show vlan name VLAN command:. Related Commands Command Description switchport mode. This is an example of output from the show vmps statistics command. Number of times that the VMPS sent a response to shut down the port. The client disables the port and removes all dynamic addresses on this port from the address table. You must re-enable the port to restore connectivity. Number of times that the VMPS denied the client request for security reasons.

When the VMPS response is to deny an address, no frame is forwarded to or from the workstation with that address broadcast or multicast frames are delivered to the workstation if the port has been assigned to a VLAN. The client keeps the denied address in the address table as a blocked address to prevent further queries from being sent to the VMPS for each new packet received from this workstation. The client ages the address if no new packets are received from this workstation on this port within the aging time period.

Number of times that the management domain in the request does not match the one for the VMPS. Any previous VLAN assignments of the port are not changed. This response means that the server and the client have not been configured with the same VTP management domain. Number of times that the version field in the query packet contains a value that is higher than the version supported by the VMPS. The previous VLAN assignment of the port is not changed. The switch sends only VMPS version 1 requests. Number of times that the VMPS is unable to answer the request because of a resource availability problem.

If the retry limit has not yet been reached, the client repeats the request with the same server or with the next alternate server, depending on whether the per-server retry count has been reached. Related Commands Command Description clear vmps statistics. Syntax Description counters. This is an example of output from the show vtp counters command. Number of summary advertisements received by this switch on its trunk ports. Summary advertisements contain the management domain name, the configuration revision number, the update timestamp and identity, the authentication checksum, and the number of subset advertisements to follow.

Number of subset advertisements received by this switch on its trunk ports. Subset advertisements contain all the information for one or more VLANs. Number of advertisement requests received by this switch on its trunk ports. Advertisement requests normally request information on all VLANs.

They can also request information on a subset of VLANs. Number of summary advertisements sent by this switch on its trunk ports. Number of subset advertisements sent by this switch on its trunk ports. Number of advertisement requests sent by this switch on its trunk ports. Revision errors increment whenever the switch receives an advertisement whose revision number matches the revision number of the switch, but the MD5 digest values do not match.

This error means that the VTP password in the two switches is different or that the switches have different configurations. These errors mean that the switch is filtering incoming advertisements, which causes the VTP database to become unsynchronized across the network. Digest errors increment whenever the MD5 digest in the summary packet and the MD5 digest of the received advertisement calculated by the switch do not match. This error usually means that the VTP password in the two switches is different. To solve this problem, make sure that the VTP password on all switches is the same.

To solve this problem, change the configuration of the switches in VTP V2-mode to disabled. This is an example of output from the show vtp status command. Displays the VTP version operating on the switch. You can configure VLANs on it. By default, every switch is a VTP server. You cannot configure VLANs on it. Transparent: a switch in VTP transparent mode is disabled for VTP, does not transmit advertisements or learn from advertisements sent by other devices, and cannot affect VLAN configurations on other devices in the network. The switch receives VTP advertisements and forwards them on all trunk ports except the one on which the advertisement was received.

The configuration of multi-VLAN ports causes the switch to automatically enter transparent mode. If you define more than or 64 or if the switch receives an advertisement that contains more than or 64 VLANs, the switch automatically enters VTP transparent mode and operates with the VLAN configuration preceding the one that sent it into transparent mode. Displays whether pruning is enabled or disabled.

Enabling pruning on a VTP server enables pruning for the entire management domain. Pruning restricts flooded traffic to those trunk links that the traffic must use to access the appropriate network devices. Displays if VTP version 2 mode is enabled. All VTP version 2 switches operate in version 1 mode by default. A network of VTP devices should be configured to version 2 only if all VTP switches in the network can operate in version 2 mode. Displays the date and time of the last configuration modification.

Displays the IP address of the switch that caused the configuration change to the database. Related Commands Command Description clear vtp counters. Use the shutdown interface configuration command to disable a port and to shut down the management VLAN. Use the no form of this command to restart a disabled port or to activate the management VLAN. The shutdown command for a port causes it to stop forwarding.

You can enable the port with the no shutdown command. The no shutdown command has no effect if the port is a static-access port assigned to a VLAN that has been deleted, suspended, or shut down. The port must first be a member of an active VLAN before it can be re-enabled. Only one management VLAN interface can be active at a time. The remaining VLANs are shut down. In the show running-config command, the active management VLAN interface is the one with the shutdown command displayed. Use the shutdown vlan global configuration command to shut down suspend local traffic on the specified VLAN.

Use the no form of this command to restart local traffic on the VLAN. The default VLANs are 1 and to Do not enter leading zeroes. It shuts down traffic locally, but the switch still advertises VTP information. Related Commands Command Description mac-address-table notification. Use the no form of this command to disable the VMPS trap notification. Specify the host that receives the traps by using the snmp-server host global configuration command.

Use the no form of this command to disable VTP trap notification. Use the no form of this command to remove the specified host.

Syntax Description host-address. Use the snmp-server host global configuration command with the snmp-server enable traps global commands to generate traps. Related Commands Command Description snmp-server enable traps vlan-membership. Use the snmp trap mac-notification interface configuration command to enable or disable the MAC notification traps on a particular port. Use the no form of the command to return the port to default settings. Syntax Description added. Even though the notification trap is enabled for a particular port, the trap is actually generated only when the global MAC trap flag is also enabled.

To enable the global trap flag, use the snmp-server enable traps mac-notification global configuration command. Related Commands mac-address-table notification. Syntax Description vlan stp-list. Valid IDs are from 1 to Ports that are administratively down remain down. The setting takes effect when the VLAN is activated. You can verify the previous command by entering the show spanning-tree user EXEC command.

In this instance, VLAN 5 does not appear in the list. Related Commands Command Description show spanning-tree. Use the spanning-tree cost interface configuration command to set the path cost for Spanning Tree Protocol STP calculations. In the event of a loop, spanning tree considers the path cost when selecting an interface to place into the forwarding state. Use the no form of this command to return to the default value. Path cost can range from 1 to , with higher values indicating higher costs. The default path cost is computed from the interface bandwidth setting. These are the IEEE default path cost values:.

You can set a cost for a port or on a VLAN that does not exist. The setting takes effect when the VLAN exists. Use the spanning-tree forward-time global configuration command to set the forwarding-time for the specified spanning-tree instances. The forwarding time determines how long each of the listening and learning states last before the port begins forwarding. You can set the forwarding-time on a VLAN that has no ports assigned to it.

The setting takes effect when you assign ports to it. Use the no form of this command to return to the default interval. You can set the hello time on a VLAN that has no ports assigned to it. Use the spanning-tree max-age global configuration command to change the interval between messages the spanning tree receives from the root switch. Interval the switch waits between receiving BPDUs from the root switch. Enter a number from 6 to The max-age setting must be greater than the hello-time setting.

You can set the max-age on a VLAN that has no ports assigned to it. The setting takes effect when you assign ports to the VLAN. This example shows how to reset the max-age parameter to the default value for spanning-tree instances through You can verify the previous commands by entering the show spanning-tree user EXEC command. SEFOS config-vlan vlan active. Configures the PVID on a port. The no form of the command sets the PVID to the default value on the port. SEFOS config-if switchport pvid 3.

Operates similar to the command switchport pvid. SEFOS config-if switchport access vlan 3. Usage is based on an acceptable frame type of the port. Packets are either dropped or accepted at ingress. Once a packet is accepted, if the packet has a tag, is be processed against that tag. Otherwise, the packet is processed against PVID. Configures the acceptable frame type for the port. The no form of the command sets the default value of acceptable frame type all frames accepted.

Both tagged and untagged frames are allowed. SEFOS config-if switchport acceptable-frame-type tagged. Enables ingress filtering on the port. The no form of this command disables ingress filtering on the port. SEFOS config-if switchport ingress-filter. Sets the default user priority for the port. The no form of the command sets the default user priority for the port to the default value. SEFOS config-if switchport priority default 5. Configures the VLAN port mode. The no form of the command configures the default VLAN port mode. An access port can accept and send only untagged frames. A hybrid port can send or accept both tagged and untagged frames.

SEFOS config-if switchport mode access. Enables dot1q-tunneling on the specified interface. The no form of the command disables dot1q-tunneling on the specified interface. SEFOS config-if switchport mode dot1q-tunnel. Configures the GARP join time, leave time, and leaveall time in milli-seconds. SEFOS config-if set garp timer join Enables or disables restricted VLAN registration on the port.


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SEFOS config-if vlan restricted enable. Enables or disables restricted group registration on a port.


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  5. SEFOS config-if group restricted enable. Maps a priority to a traffic class on the specified port. The frame received on the interface with the configured priority is processed in the configured traffic class. The no form of the command maps the default priority to traffic class value on the port. SEFOS config-if vlan map-priority 2 traffic-class 2. The default traffic class value depends on the configured priority value. Following is the list of default traffic class values for different priority values:.

    Shuts down the GARP module. The no form of the command starts and enables the GARP module. SEFOS config shutdown garp. Sets the debug level. The no form of the command sets the debug level to default value. If the switch supports multiple instances, the name of the instance can be specified. Otherwise this parameter need not be given or the context name can be given as default.

    The keyword switch is not supported. SEFOS debug vlan fwd all. Sets debug level. The keyword redundancy is not supported. Otherwise, this parameter need not be given or the context name can be given as default. SEFOS debug garp protocol all. Displays the VLAN information in the database. This parameter is specific to multiple instance.

    If the optional parameter is not specified then this command displays the VLAN information of all the available interfaces. Displays the VLAN related global status variables. SEFOS show vlan device info. SEFOS show vlan device capabilities.