Table of Contents

Chapter 1 MAC Address Table Management Configuration Commands. 1-1

1.1 MAC Address Table Management Configuration Commands. 1-1

1.1.1 display mac-address aging-time. 1-1

1.1.2 display mac-address. 1-2

1.1.3 display port-mac. 1-4

1.1.4 mac-address. 1-4

1.1.5 mac-address aging destination-hit enable. 1-6

1.1.6 mac-address max-mac-count 1-7

1.1.7 mac-address timer 1-8

1.1.8 port-mac. 1-9

Chapter 1  MAC Address Table Management Configuration Commands

1.1  MAC Address Table Management Configuration Commands

1.1.1  display mac-address aging-time

Syntax

display mac-address aging-time

View

Any view

Parameters

None

Description

Use the display mac-address aging-time command to display the aging time of the dynamic MAC address entries in the MAC address table.

Related commands: mac-address, mac-address timer, display mac-address.

Examples

# Display the aging time of the dynamic MAC address entries.

<Sysname> display mac-address aging-time

Mac address aging time: 300s

The output information indicates that the aging time of the dynamic MAC address entries is 300 seconds.

<Sysname> display mac-address aging-time

Mac address aging time: no-aging

The output information indicates that dynamic MAC address entries do not age out.

1.1.2  display mac-address

Syntax

display mac-address [ display-option ]

View

Any view

Parameters

display-option: Option used to display specific MAC address table information, as described in Table 1-1.

Table 1-1 Description on the display-option argument

mac-address: Specifies a MAC address, in the form of H-H-H.

static: Displays static MAC address entries.

dynamic: Displays dynamic MAC address entries.

blackhole: Displays blackhole MAC address entries.

interface-type interface-number: Specify a port by its interface type and number, of which the MAC address entries are displayed.

vlan-id: Specifies a VLAN by its ID in the range of 1 to 4094, in which the MAC address entries are displayed.

count: Displays only the total number of the MAC address entries.

statistics: Displays statistics of the MAC address entries maintained by the switch.

Description

Use the display mac-address command to display information about MAC address entries in the MAC address table, including: MAC address, VLAN and port corresponding to the MAC address, the type (static or dynamic) of a MAC address entry, whether a MAC address is within the aging time and so on.

Examples

# Display information about MAC address 000f-e20f-0101.

<Sysname> display mac-address 000f-e20f-0101

MAC ADDR          VLAN ID   STATE          PORT INDEX       AGING TIME(s)

000f-e20f-0101    1         Learned        Ethernet1/0/1    AGING

# Display the MAC address entries for the port Ethernet 1/0/4.

<Sysname> display mac-address interface Ethernet 1/0/4

MAC ADDR        VLAN ID   STATE          PORT INDEX               AGING TIME(s)

000d-88f6-44ba  1          Learned       Ethernet1/0/4           AGING

000d-88f7-9f7d  1       Learned       Ethernet1/0/4           AGING

000d-88f7-b094  1       Learned       Ethernet1/0/4           AGING

000f-e200-00cc  1       Learned       Ethernet1/0/4           AGING

000f-e200-2201  1       Learned       Ethernet1/0/4           AGING

000f-e207-f2e0  1       Learned       Ethernet1/0/4           AGING

000f-e209-ecf9  1       Learned       Ethernet1/0/4           AGING

---  7 mac address(es) found on port Ethernet1/0/4 ---   

# Display the total number of MAC address entries for VLAN 2.

<Sysname> display mac-address vlan 2 count

9 mac address(es) found in vlan 2

Table 1-2 Description on the fields of the display mac-address command

1.1.3  display port-mac

Syntax

display port-mac

View

Any view

Parameters

None

Description

Use the display port-mac command to display the configured start port MAC address for the Ethernet ports on the switch, that is, the MAC address of Ethernet 1/0/1.

Related commands: port-mac.

Examples

# Display the start port MAC address.

<Sysname> display port-mac

Port MAC start address : 000f-e200-0001

1.1.4  mac-address

Syntax

l           In system view:

mac-address { static | dynamic | blackhole } mac-address interface interface-type interface-number vlan vlan-id

undo mac-address [ mac-address-attribute ]

l           In Ethernet port view:

mac-address { static | dynamic | blackhole } mac-address vlan vlan-id

undo mac-address { static | dynamic | blackhole } mac-address vlan vlan-id

View

System view, Ethernet port view

Parameters

static: Specifies a static MAC address entry.

dynamic: Specifies a dynamic MAC address entry.

blackhole: Specifies a blackhole MAC address entry.

mac-address: Specifies a MAC address, in the form of H-H-H. When entering the MAC address, you can omit the leading 0s in each segment. For example, you can input f-e2-1 for 000f-00e2-0001.

interface-type interface-number: Specifies the outgoing port by its type and number for the MAC address. All traffic destined for the MAC address will be sent out the port.

vlan-id: Specifies a VLAN ID, in the range of 1 to 4094. The VLAN must already exist.

mac-address-attribute: Specifies the criteria for removing MAC address entries. Available syntax options for the argument are described in Table 1-3.

Table 1-3 Available syntax options for the mac-address-attribute argument

Description

Use the mac-address command to add or modify a MAC address entry.

Use the undo mac-address command to remove one or more MAC address entries.

In Ethernet port view, the MAC address entry configured with the mac-address command in Ethernet port view takes the current Ethernet port as the outgoing port.

If the MAC address you input in the mac-address command already exists in the MAC address table, the system will modify the attributes of the corresponding MAC address entry according to your settings in the command.

You can remove all unicast MAC address entries on a port, or remove a specific type of MAC address entries, such as the addresses learnt by the system, dynamic or static MAC address entries configured, or blackhole addresses.

Examples

# Configure a static MAC address entry with the following settings:

l           MAC address: 000f-e20f-0101

l           Outbound port: Ethernet 1/0/1 port

l           Ethernet 1/0/1 port belongs to VLAN 2.

<Sysname> system-view

System View: return to User View with Ctrl+Z.

[Sysname] mac-address static 000f-e20f-0101 interface Ethernet 1/0/1 vlan 2

1.1.5  mac-address aging destination-hit enable

Syntax

mac-address aging destination-hit enable

undo mac-address aging destination-hit enable

View

System view

Parameters

None

Description

Use the mac-address aging destination-hit enable command to enable the destination MAC address triggered update function.

Use the undo mac-address aging destination-hit enable command to disable the function.

With the destination MAC address triggered update function, the switch, when forwarding packets, updates the MAC address entries for the destination MAC addresses. This increases the MAC address table update frequency, improves the usability of the MAC address table, and reduces broadcasts.

By default, the destination MAC address triggered update function is disabled.

Examples

# Enable destination MAC address triggered update.

<Sysname> system-view

System View: return to User View with Ctrl+Z.

[Sysname] mac-address aging destination-hit enable

1.1.6  mac-address max-mac-count

Syntax

mac-address max-mac-count count

undo mac-address max-mac-count

View

Ethernet port view

Parameters

count: Maximum number of MAC addresses a port can learn. This argument ranges from 0 to 4096. A value of 0 disables the port from learning MAC addresses.

Description

Use the mac-address max-mac-count command to set the maximum number of MAC addresses an Ethernet port can learn.

Use the undo mac-address max-mac-count command to cancel the limitation on the number of MAC addresses an Ethernet port can learn.

By default, the number of MAC addresses an Ethernet port can learn is unlimited.

When you use the mac-address max-mac-count command, the port stops learning MAC addresses after the number of MAC addresses it learned reaches the value of the count argument you provided. You can use the undo command to cancel this limit so that the port can learn MAC addresses without the number limitation. By default, no number limitation is set to the port for MAC address learning.

To prevent illegal devices from accessing the network through a port, you can configure static MAC addresses and disable MAC address learning for the port. Thus, only the packets destined for the configured MAC addresses can be forwarded out the port.

Related commands: mac-address, mac-address timer.

Examples

# Set the maximum number of MAC addresses Ethernet 1/0/3 port can learn to 600.

<Sysname> system-view

System View: return to User View with Ctrl+Z.

[Sysname] interface Ethernet 1/0/3

[Sysname-Ethernet1/0/3] mac-address max-mac-count 600

1.1.7  mac-address timer

Syntax

mac-address timer { aging age | no-aging }

undo mac-address timer aging

View

System view

Parameters

aging age: Specifies the aging time (in seconds) for dynamic MAC address entries. The age argument ranges from 10 to 1000000.

no-aging: Specifies not to age dynamic MAC address entries.

Description

Use the mac-address timer command to set the MAC address aging timer.

Use the undo mac-address timer command to restore the default.

The default MAC address aging timer is 300 seconds.

The timer applies only to dynamic address entries, including both entries learnt and configured.

Setting an appropriate MAC address aging timer is important for the switch to run efficiently.

l           If the aging timer is set too short, the MAC address entries that are still valid may be removed. Upon receiving a packet destined for a MAC address that is already removed, the switch broadcasts the packet through all its ports in the VLAN which the packet belongs to. This decreases the operating performance of the switch.

l           If the aging timer is set too long, MAC address entries may still exist even if they turn invalid. This causes the switch to be unable to update its MAC address table in time. In this case, the MAC address table cannot reflect the position changes of network devices in time.

Examples

# Set the aging time of MAC address entries to 500 seconds.

<Sysname> system-view

System View: return to User View with Ctrl+Z.

[Sysname] mac-address timer aging 500

1.1.8  port-mac

Syntax

port-mac start-mac-address

undo port-mac

View

System view

Parameters

start-mac-address: Start MAC address for the Ethernet ports on the switch, in the format of H-H-H. It must be a valid unicast address.

Description

Use the port-mac command to configure the start MAC address for the Ethernet ports on the device. This MAC address is assigned to port Ethernet 1/0/1, and is called the start port MAC address.

Use the undo port-mac command to remove the configuration.

Examples

# Set the start port MAC address to 000f-e200-0001.

<Sysname> system-view

System View: return to User View with Ctrl+Z.

[Sysname] port-mac 000f-e200-0001