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| Title | Size | Download |
|---|---|---|
| 01-MAC address table commands | 91.27 KB |
display mac-address aging-time
display mac-address mac-learning
mac-address mac-learning enable
mac-address max-mac-count (interface view)
mac-address max-mac-count (VLAN view)
mac-address max-mac-count enable-forwarding (interface view)
mac-address max-mac-count enable-forwarding (VLAN view)
mac-address notification mac-move
mac-address notification mac-move suppression (interface view)
mac-address notification mac-move suppression (system view)
snmp-agent trap enable mac-address
MAC address table commands
This document covers the configuration of unicast MAC address entries, including static, dynamic, blackhole, and multiport unicast MAC address entries. For more information about configuring static multicast MAC address entries, see IGMP snooping and IPv6 multicast routing and forwarding in IP Multicast Configuration Guide. For more information about MAC address table configuration in VPLS, see MPLS Configuration Guide.
display mac-address
Use display mac-address to display MAC address entries.
Syntax
display mac-address [ mac-address [ vlan vlan-id ] | [ [ dynamic | static ] [ interface interface-type interface-number ] | blackhole | multiport ] [ vlan vlan-id ] [ count ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
mac-address: Specifies a MAC address in the format of H-H-H. When entering a MAC address, you can omit the leading zeros in each H section. For example, enter f-e2-1 for 000f-00e2-0001.
vlan vlan-id: Specifies a VLAN by its ID in the range of 1 to 4094.
dynamic: Displays dynamic MAC address entries.
static: Displays static MAC address entries.
interface interface-type interface-number: Specifies an interface by its type and number.
blackhole: Displays blackhole MAC address entries.
multiport: Displays multiport unicast MAC address entries.
count: Displays only the number of MAC address entries that match all entry attributes you specify in the command. Detailed information about MAC address entries is not displayed. For example, you can use the display mac-address vlan 20 dynamic count command to display the number of dynamic entries for VLAN 20. If you do not specify an entry attribute, the command displays the number of entries in the MAC address table. If you do not specify this keyword, the command displays detailed information about the specified MAC address entries.
Usage guidelines
Use this command to display static, dynamic, blackhole, or multiport unicast MAC address entries. A MAC address entry includes a destination MAC address, an outgoing interface, and a VLAN ID.
If you do not specify any parameters, the command displays all MAC address entries.
This command displays dynamic MAC address entries for an aggregate interface only when the aggregate interface has a minimum of one Selected member port.
Multiport unicast MAC address entries have no impact on the MAC address learning. When receiving a frame whose source MAC address matches a multiport unicast entry, the device can still learn the MAC address of the frame and generate a dynamic entry. However, the generated dynamic entry has lower priority. The device prefers to use the multiport unicast entry to forward frames destined for the MAC address in the entry.
Examples
# Display MAC address entries for VLAN 100.
<Sysname> display mac-address vlan 100
MAC Address VLAN ID State Port/Nickname Aging
0001-0101-0101 100 Multiport GE1/0 N
0033-0033-0033 100 Blackhole N/A N
# Display the number of MAC address entries.
<Sysname> display mac-address count
1 mac address(es) found.
Table 1 Command output
|
Field |
Description |
|
VLAN ID |
ID of the VLAN to which the outgoing interface of the MAC address entry belongs. |
|
State |
MAC address entry state: · Static—Static MAC address entry. · Learned—Dynamic MAC address entry. Dynamic entries can be learned or manually configured. · Blackhole—Blackhole MAC address entry. · Multiport—Multiport unicast MAC address entry. · Multicast—Multicast MAC address entry. · OpenFlow—MAC address entry for an OpenFlow instance. · Drop aging—MAC address entry that can age out. Packets from this MAC address are dropped. · Drop no-aging—MAC address entry that cannot age out. Packets from this MAC address are dropped. · Vlan-interface—MAC address entry of a VLAN interface. |
|
Port/Nickname |
When the field displays an interface name, the field indicates the outgoing interface for packets that are destined for the MAC address. This field displays N/A for a blackhole MAC address entry. |
|
Aging |
Whether the entry can age out: · Y—The entry can age out. · N—The entry never ages out. |
|
mac address(es) found |
Number of matching MAC address entries. |
Related commands
mac-address
mac-address timer
display mac-address aging-time
Use display mac-address aging-time to display the aging timer for dynamic MAC address entries.
Syntax
display mac-address aging-time
Views
Any view
Predefined user roles
network-admin
network-operator
Examples
# Display the aging timer for dynamic MAC address entries.
<Sysname> display mac-address aging-time
MAC address aging time: 300s.
Related commands
mac-address timer
display mac-address mac-learning
Use display mac-address mac-learning to display the global MAC address learning status and the MAC learning status of the specified interface or all interfaces.
Syntax
display mac-address mac-learning [ interface interface-type interface-number ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
interface interface-type interface-number: Specifies an interface by its type and number. If you do not specify an interface, the command displays the global MAC address learning status and the MAC address learning status of all interfaces.
Examples
# Display the global MAC address learning status and the MAC learning status of all interfaces.
<Sysname> display mac-address mac-learning
Global MAC address learning status: Enabled.
Port Learning Status
BAGG1 Enabled
BAGG2 Enabled
Table 2 Command output
|
Field |
Description |
|
Global MAC address learning status |
Global MAC address learning status: · Enabled. · Disabled. |
|
Learning Status |
MAC address learning status of an interface: · Enabled. · Disabled. |
Related commands
mac-address mac-learning enable
display mac-address mac-move
Use display mac-address mac-move to display the MAC address move records after the device is started.
Syntax
In standalone mode:
display mac-address mac-move
In IRF mode:
display mac-address mac-move [ slot slot-number ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, the command displays MAC address move records for all IRF member devices. (In IRF mode.)
Usage guidelines
When a MAC address frequently moves between the specified two interfaces, Layer 2 loops might occur in the network. To discover and locate loops, you can view the MAC address move records.
In the MAC address move records, records with the same MAC address, VLAN, source port, and current port are considered to be one record.
(In standalone mode.) A device can save a maximum of 20 MAC address move records. When the number of MAC address move records exceeds 20, the most recent record will override the oldest record based on the last MAC address move time.
(In IRF mode.) An IRF member device can save a maximum of 20 MAC address move records. When the number of MAC address move records exceeds 20, the most recent record will override the oldest record based on the last MAC address move time.
Examples
<Sysname> display mac-address mac-move
MAC address VLAN Current port Source port Last time Times
0000-0001-002c 1 GE1/0 GE2/0 2013-05-20 13:40:52 1
0000-0001-002c 1 GE2/0 GE1/0 2013-05-20 13:41:30 1
--- 2 MAC address moving records found ---
Table 3 Command output
|
Field |
Description |
|
VLAN |
VLAN to which the outgoing interface of the MAC address entry belongs. |
|
Current port |
Interface to which the MAC address was moved. |
|
Source port |
Interface from which the MAC address was moved. |
|
Last time |
Last time when the MAC address was moved. |
|
Times |
Number of MAC address moves after the device is started. For a MAC address record, the number of MAC address moves is increased by 1 when a new MAC address move has the same MAC address, VLAN, Current Port, and Source Port fields as the MAC address record. |
Related commands
mac-address notification mac-move
mac-address (interface view)
Use mac-address to add or modify a MAC address entry on an interface.
Use undo mac-address to delete a MAC address entry on an interface.
Syntax
Layer 2 Ethernet interface view and Layer 2 aggregate interface view:
mac-address { dynamic | multiport | static } mac-address vlan vlan-id
undo mac-address { dynamic | multiport | static } mac-address vlan vlan-id
Default
An interface is not configured with MAC address entries.
Views
Layer 2 Ethernet interface view
Layer 2 aggregate interface view
Predefined user roles
network-admin
Parameters
dynamic: Specifies dynamic MAC address entries.
static: Specifies static MAC address entries.
multiport: Specifies multiport unicast MAC address entries. A frame whose destination MAC address matches a multiport unicast MAC address entry is sent out of multiple ports.
mac-address: Specifies a MAC address in the format of H-H-H, excluding multicast, all-zero, and all-F MAC addresses. When entering a MAC address, you can omit the leading zeros in each H section. For example, enter f-e2-1 for 000f-00e2-0001.
vlan vlan-id: Specifies an existing VLAN to which the specified interface belongs. The value range for the vlan-id argument is 1 to 4094.
Usage guidelines
Typically, the device automatically builds the MAC address table by learning the source MAC addresses of incoming frames on each interface. However, you can manually configure static MAC address entries. For a MAC address, a manually configured static entry takes precedence over a dynamically learned entry. To improve the security for the user device connected to an interface, manually configure a static entry to bind the user device to the interface. Then, the frames destined for the user device (for example, Host A) are always sent out of the interface. Other hosts using the forged MAC address of Host A cannot obtain the frames destined for Host A.
The MAC address entry configuration cannot survive a reboot unless you save it. The dynamic MAC address entries, however, are lost upon reboot whether or not you save the configuration.
Examples
# Add a static entry for MAC address 000f-e201-0101 on GigabitEthernet 1/0 that belongs to VLAN 2.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0
[Sysname-GigabitEthernet1/0] mac-address static 000f-e201-0101 vlan 2
# Add a static entry for MAC address 000f-e201-0101 on Bridge-Aggregation 1 that belongs to VLAN 1.
<Sysname> system-view
[Sysname] interface bridge-aggregation 1
[Sysname-Bridge-Aggregation1] mac-address static 000f-e201-0102 vlan 1
# Add a multiport unicast MAC address entry for MAC address 0001-0001-0101 on GigabitEthernet 1/0 and GigabitEthernet 2/0 that belong to VLAN 2.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0
[Sysname-GigabitEthernet1/0] mac-address multiport 0001-0001-0101 vlan 2
[Sysname-GigabitEthernet1/0] quit
[Sysname] interface gigabitethernet 2/0
[Sysname-GigabitEthernet2/0] mac-address multiport 0001-0001-0101 vlan 2
Related commands
display mac-address
mac-address (system view)
mac-address (system view)
Use mac-address to add or modify a MAC address entry.
Use undo mac-address to delete one or all MAC address entries.
Syntax
mac-address { dynamic | static } mac-address interface interface-type interface-number vlan vlan-id
mac-address blackhole mac-address vlan vlan-id
mac-address multiport mac-address interface interface-list vlan vlan-id
undo mac-address [ [ dynamic | static ] mac-address interface interface-type interface-number vlan vlan-id ]
undo mac-address [ blackhole | dynamic | static ] [ mac-address ] vlan vlan-id
undo mac-address [ dynamic | static ] interface interface-type interface-number
undo mac-address multiport mac-address interface interface-list vlan vlan-id
undo mac-address [ multiport ] [ [ mac-address ] vlan vlan-id ]
Default
The system is not configured with MAC address entries.
Views
System view
Predefined user roles
network-admin
Parameters
dynamic: Specifies dynamic MAC address entries.
static: Specifies static MAC address entries.
blackhole: Specifies blackhole MAC address entries. Packets whose source or destination MAC addresses match blackhole MAC address entries are dropped.
multiport: Specifies multiport unicast MAC address entries. A frame whose destination MAC address matches a multiport unicast MAC address entry is sent out of multiple ports.
mac-address: Specifies a MAC address in the format of H-H-H, excluding multicast, all-zero, and all-F MAC addresses. When entering a MAC address, you can omit the leading zeros in each H section. For example, enter f-e2-1 for 000f-00e2-0001.
vlan vlan-id: Specifies an existing VLAN to which the interface belongs. The value range for the vlan-id argument is 1 to 4094.
interface interface-type interface-number: Specifies an outgoing interface by its type and number.
interface interface-list: Specifies interfaces in the format of { interface-type interface-number1 [ to interface-type interface-number2 ] } &<1-4>. The interfaces can only be Layer 2 Ethernet interfaces or Layer 2 aggregate interfaces. The value for the interface-number2 argument cannot be lower than the value for the interface-number1 argument. &<1-4> specifies that you can configure a maximum of four interfaces or interface ranges.
Usage guidelines
You can use this command to configure the following types of MAC address entries:
· Dynamic entries.
Dynamic entries include manually configured dynamic entries and automatically learned dynamic entries.
· Static entries.
For a MAC address, a manually configured static entry takes precedence over a dynamic entry. To improve the security for the user device connected to an interface, manually configure a static entry to bind the user device to the interface. Then, the frames destined for the user device (for example, Host A) are always sent out of the interface. Other hosts using the forged MAC address of Host A cannot obtain the frames destined for Host A.
· Blackhole entries.
To drop frames with the specified source MAC addresses or destination MAC addresses, you can configure blackhole entries.
· Multiport unicast entries.
To send frames with a specific destination MAC address out of multiple ports, configure a multiport unicast entry. When you execute this command for the first time, the command adds an entry. When you execute the command again with the same MAC address and VLAN but with different interfaces, this command adds the specified interfaces for this entry.
A static or blackhole entry can overwrite a dynamic entry, but not vice versa.
If you execute the undo mac-address command without specifying any parameters, this command deletes all unicast MAC address entries and static multicast MAC address entries.
You can delete all the MAC address entries (including unicast and static multicast MAC address entries) from the specified VLAN. You can also delete only one type (dynamic, static, or blackhole) of MAC address entries. You can single out an interface and delete the unicast MAC address entries on it, but not the static multicast MAC address entries.
Examples
# Add a static entry for MAC address 000f-e201-0101. Then, all frames that are destined for this MAC address are sent out of GigabitEthernet 1/0, which belongs to VLAN 2.
<Sysname> system-view
[Sysname] mac-address static 000f-e201-0101 interface gigabitethernet 1/0 vlan 2
# Add a multiport unicast MAC address entry for MAC address 000f-e201-0101. Then, all frames that are destined for this MAC address are sent out of GigabitEthernet 1/0 through GigabitEthernet 3/0, which belong to VLAN 2.
<Sysname> system-view
[Sysname] mac-address multiport 000f-e201-0101 interface gigabitethernet 1/0 to gigabitethernet 3/0 vlan 2
Related commands
display mac-address
mac-address (interface view)
mac-address mac-learning enable
Use mac-address mac-learning enable to enable MAC address learning globally or on an interface.
Use undo mac-address mac-learning enable to disable MAC address learning globally or on an interface.
Syntax
mac-address mac-learning enable
undo mac-address mac-learning enable
Default
MAC address learning is enabled.
Views
System view
Layer 2 Ethernet interface view
Layer 2 aggregate interface view
Predefined user roles
network-admin
Usage guidelines
To prevent the MAC address table from becoming saturated, you can disable MAC address learning.
For example, a number of packets with different source MAC addresses reaching a device can affect the MAC address table update. To avoid such attacks, you can disable MAC address learning by following these guidelines:
· You can disable MAC address learning on a per-interface basis. If you disable MAC address learning globally, MAC address learning is disabled for all interfaces. The device then stops learning MAC addresses and cannot dynamically update the MAC address table.
· Because disabling MAC address learning can result in broadcast storms, enable broadcast storm suppression after you disable MAC address learning on an interface. For more information about broadcast storm suppression, see Interface Configuration Guide.
· With MAC address learning enabled globally, you can disable MAC address learning for an interface.
· After MAC address learning is disabled, existing dynamic MAC address entries can age out.
Examples
# Disable MAC address learning globally.
<Sysname> system-view
[Sysname] undo mac-address mac-learning enable
# Disable MAC address learning on GigabitEthernet 1/0.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0
[Sysname-GigabitEthernet1/0] undo mac-address mac-learning enable
# Disable MAC address learning on Bridge-Aggregation 1.
<Sysname> system-view
[Sysname] interface bridge-aggregation 1
[Sysname-Bridge-Aggregation1] undo mac-address mac-learning enable
Related commands
display mac-address mac-learning
mac-address max-mac-count (interface view)
Use mac-address max-mac-count to set the MAC learning limit on an interface.
Use undo mac-address max-mac-count to restore the default.
Syntax
mac-address max-mac-count count
undo mac-address max-mac-count
Default
The MAC learning limit on an interface is 1024.
Views
Layer 2 Ethernet interface view
Layer 2 aggregate interface view
Predefined user roles
network-admin
Parameters
count: Specifies the maximum number of MAC addresses that can be learned on an interface. When the argument is set to 0, the interface is not allowed to learn MAC addresses. The value range for this argument is 0 to 1024.
Usage guidelines
This command helps limit the MAC address table size. When the number of MAC address entries learned by an interface reaches the limit, the interface stops learning MAC address entries.
Examples
# Configure GigabitEthernet 1/0 to learn a maximum of 200 MAC address entries.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0
[Sysname-GigabitEthernet1/0] mac-address max-mac-count 200
Related commands
mac-address
mac-address max-mac-count enable-forwarding (interface view)
mac-address max-mac-count (VLAN view)
Use mac-address max-mac-count to set the MAC learning limit for a VLAN.
Use undo mac-address max-mac-count to restore the default.
Syntax
mac-address max-mac-count count
undo mac-address max-mac-count
Default
The MAC learning limit for a VLAN is 2048.
Views
VLAN view
Predefined user roles
network-admin
Parameters
count: Specifies the maximum number of MAC addresses that can be learned for a VLAN. When the argument is set to 0, the VLAN is not allowed to learn MAC addresses. The value range for this argument is 0 to 2048.
Usage guidelines
This command limits the number of MAC address entries to limit the MAC address table size. A large MAC address table will degrade forwarding performance. When the number of MAC address entries learned by a VLAN reaches the limit, the VLAN stops learning MAC address entries.
Examples
# Configure VLAN 10 to learn a maximum of 200 MAC address entries.
<Sysname> system-view
[Sysname] vlan 10
[Sysname-vlan10] mac-address max-mac-count 200
Related commands
mac-address
mac-address max-mac-count enable-forwarding (VLAN view)
mac-address max-mac-count enable-forwarding (interface view)
Use mac-address max-mac-count enable-forwarding to enable the device to forward unknown frames received on an interface after the MAC learning limit on the interface is reached. Unknown frames refer to frames whose source MAC addresses are not in the MAC address table.
Use undo mac-address max-mac-count enable-forwarding to disable the device from forwarding unknown frames received on an interface after the MAC learning limit on the interface is reached.
Syntax
mac-address max-mac-count enable-forwarding
undo mac-address max-mac-count enable-forwarding
Default
When the MAC learning limit on an interface is reached, the device can forward unknown frames received on the interface.
Views
Layer 2 Ethernet interface view
Layer 2 aggregate interface view
Predefined user roles
network-admin
Examples
# Configure GigabitEthernet 1/0 to learn a maximum of 200 MAC address entries.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0
[Sysname-GigabitEthernet1/0] mac-address max-mac-count 200
# Disable the device from forwarding unknown frames received on GigabitEthernet 1/0 after the MAC learning limit on GigabitEthernet 1/0 is reached.
[Sysname-GigabitEthernet1/0] undo mac-address max-mac-count enable-forwarding
Related commands
mac-address
mac-address max-mac-count (interface view)
mac-address max-mac-count enable-forwarding (VLAN view)
Use mac-address max-mac-count enable-forwarding to enable the device to forward unknown frames received by interfaces in a VLAN after the MAC learning limit for the VLAN is reached. Unknown frames refer to frames whose source MAC addresses are not in the MAC address table.
Use undo mac-address max-mac-count enable-forwarding to disable the device from forwarding unknown frames received by interfaces in a VLAN after the MAC learning limit for the VLAN is reached.
Syntax
mac-address max-mac-count enable-forwarding
undo mac-address max-mac-count enable-forwarding
Default
When the MAC learning limit for a VLAN is reached, the device can forward unknown frames received by interfaces in the VLAN.
Views
VLAN view
Predefined user roles
network-admin
Examples
# Configure VLAN 10 to learn a maximum of 200 MAC address entries.
<Sysname> system-view
[Sysname] vlan 10
[Sysname-vlan10] mac-address max-mac-count 200
# Disable the device from forwarding unknown frames received by interfaces in VLAN 10 after the MAC learning limit for VLAN 10 is reached.
[Sysname-vlan10] undo mac-address max-mac-count enable-forwarding
Related commands
mac-address
mac-address max-mac-count (VLAN view)
mac-address notification mac-move
Use mac-address notification mac-move to enable MAC address move notifications and optionally specify a MAC move detection interval.
Use undo mac-address notification mac-move to disable MAC address move notifications.
Syntax
mac-address notification mac-move [ interval interval ]
undo mac-address notification mac-move
Default
MAC address move notifications are disabled.
Views
System view
Predefined user roles
network-admin
Parameters
interval interval: Specifies the interval for detecting MAC address moves, in the range of 1 to 60 minutes. If you do not specify this option, the default setting of 1 minute is used.
Usage guidelines
With MAC address move notifications enabled, the system records the MAC address move logs every MAC move detection interval. Each record of the MAC address move logs contains the following information:
· MAC address.
· VLAN ID of the MAC address entry.
· Current port and source port of the MAC address moves.
· Number of MAC address moves within a detection interval.
A MAC address can have only one MAC address move record. If a MAC address moves multiple times, the new record overrides the old record.
(In standalone mode.) Within a detection interval, the device can record MAC address move information for a maximum of 20 MAC addresses. If the limit is reached, the device only updates existing records, and new MAC address moves are not recorded. Then in the next detection interval, a new MAC address move record will overwrite the earliest one generated in the previous detection interval.
(In IRF mode.) Within a detection interval, an IRF member device can record MAC address move information for a maximum of 20 MAC addresses. If the limit is reached, the device only updates existing records, and new MAC address moves are not recorded. Then in the next detection interval, a new MAC address move record will overwrite the earliest one generated in the previous detection interval.
After you execute this command, the system sends only syslog messages to the information center module. If the snmp-agent trap enable mac-address command is also executed, the system also sends SNMP notifications to the SNMP module.
Examples
# Enable MAC address move notifications.
<Sysname> system-view
[Sysname] mac-address notification mac-move
[Sysname]
%May 14 17:16:45:688 2013 Sysname MAC/4/MAC_FLAPPING: MAC address 0000-0012-0034 in VLAN 500 has moved from port GE1/0 to port GE2/0 for 1 times
The output shows that:
· The VLAN ID of MAC address 0000-0012-0034 is VLAN 500.
· The MAC address moved from GigabitEthernet 1/0 to GigabitEthernet 2/0.
· The MAC address has moved once within a MAC move detection interval.
Related commands
display mac-address mac-move
mac-address notification mac-move suppression (interface view)
Use mac-address notification mac-move suppression to enable MAC address move suppression on an interface.
Use undo mac-address notification mac-move suppression to disable MAC address move suppression on an interface.
Syntax
mac-address notification mac-move suppression
undo mac-address notification mac-move suppression
Default
MAC address moves are not suppressed.
Views
Layer 2 Ethernet interface view
Layer 2 aggregate interface view
Predefined user roles
network-admin
Usage guidelines
This feature shuts an interface down when a MAC address has been moved to or from the interface more than the suppression threshold within a MAC move detection interval. The shutdown interface automatically goes up after a suppression interval. Also, you can use the shutdown command and then the undo shutdown command to bring up the interface.
When MAC address move suppression shuts an interface down, the system sends only syslog messages to the information center module. If the snmp-agent trap enable mac-address command is also executed, the system also sends SNMP notifications to the SNMP module.
Examples
# Enable MAC address move suppression on GigabitEthernet 1/0.
[Sysname] interface gigabitethernet 1/0
[Sysname-GigabitEthernet1/0] mac-address notification mac-move suppression
Related commands
mac-address notification mac-move suppression (system view)
mac-address notification mac-move suppression (system view)
Use mac-address notification mac-move suppression to set the suppression interval or the suppression threshold.
Use undo mac-address notification mac-move suppression to restore the default.
Syntax
mac-address notification mac-move suppression { interval interval | threshold threshold }
undo mac-address notification mac-move suppression { interval | threshold }
Default
The suppression interval is 30 seconds. The suppression threshold is 3.
Views
System view
Predefined user roles
network-admin
Parameters
interval interval: Specifies the MAC address move suppression interval during which a suppressed interface stays down. The value range for the interval-value argument is 30 to 86400 seconds. If you do not specify this option, the default suppression interval of 30 seconds is used.
threshold threshold: Specifies the suppression threshold for MAC address moves sourced from or destined for an interface within a MAC move detection interval. The value range for this argument is 0 to 1024. If you do not specify this option, the default suppression threshold of 3 is used.
Usage guidelines
For this command to take effect on an interface, you must also enable MAC address move suppression on the interface.
If you set the suppression interval or suppression threshold multiple times, the most recent configuration applies. The suppression interval setting is independent of the suppression threshold setting.
Examples
# Set the suppression interval to 40 seconds and the suppression threshold to 1 for MAC address moves.
<Sysname> system-view
[Sysname] mac-address notification mac-move suppression interval 40
[Sysname] mac-address notification mac-move suppression threshold 1
Related commands
mac-address notification mac-move suppression (interface view)
mac-address timer
Use mac-address timer to set the aging timer for dynamic MAC address entries.
Use undo mac-address timer to restore the default.
Syntax
mac-address timer { aging seconds | no-aging }
undo mac-address timer
Default
The aging timer is 300 seconds for dynamic MAC address entries.
Views
System view
Predefined user roles
network-admin
Parameters
aging seconds: Specifies an aging timer for dynamic MAC address entries, in seconds. The value range for the seconds argument is 10 to 1400.
no-aging: Configures dynamic MAC address entries not to age.
Usage guidelines
To set the aging timer appropriately, follow these guidelines:
· A long aging interval causes the MAC address table to retain outdated entries and fail to accommodate the most recent network changes.
· A short aging interval results in removal of valid entries. Then, unnecessary broadcast packets appear and affect device performance.
Examples
# Set the aging time to 500 seconds for dynamic MAC address entries.
<Sysname> system-view
[Sysname] mac-address timer aging 500
Related commands
display mac-address aging-time
snmp-agent trap enable mac-address
Use snmp-agent trap enable mac-address to enable SNMP notifications for the MAC address table.
Use undo snmp-agent trap enable mac-address to disable SNMP notifications for the MAC address table.
Syntax
snmp-agent trap enable mac-address [ mac-move ]
undo snmp-agent trap enable mac-address [ mac-move ]
Default
SNMP notifications are enabled for the MAC address table.
Views
System view
Predefined user roles
network-admin
Parameters
mac-move: Specifies notifications about the MAC address moves for the MAC address table. If you do not specify this keyword, the command enables all types of SNMP notifications for the MAC address table.
Usage guidelines
To report critical MAC address move events to an NMS, enable SNMP notifications for the MAC address table. For MAC address move event notifications to be sent correctly, you must also configure SNMP on the device.
When SNMP notifications are disabled for the MAC address table, the device sends the generated logs to the information center. To display the logs, configure the log destination and output rule configuration in the information center.
For information about SNMP and information center configuration, see the network management and monitoring configuration guide for the device.
The MAC address table supports only SNMP notifications about MAC address moves. When you enable or disable SNMP notifications about MAC address moves, you enable or disable all types of SNMP notifications for the MAC address table.
Examples
# Disable SNMP notifications about MAC address moves for the MAC address table.
<Sysname> system-view
[Sysname] undo snmp-agent trap enable mac-address mac-move
Related commands
mac-address notification mac-move
