This chapter
describes the management of static, dynamic, and blackhole MAC address entries.
For information about the management of multicast MAC address entries, refer to
the section “IGMP-Snooping” in H3C S3100-SI Series Ethernet Switches
Command Manual.
Syntax
display mac-address aging-time
View
Any view
Parameter
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 command: mac-address,
mac-address timer, display mac-address.
Example
# Display the aging time of the dynamic MAC
address entries.
<H3C> 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.
<H3C> display mac-address
aging-time
Mac address aging time: no-aging
The output information indicates that
dynamic MAC address entries do not age out.
Syntax
display mac-address [ display-option ]
View
Any view
Parameter
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
|
Value
|
Description
|
|
mac-address [ vlan vlan-id ]
|
Displays information about a specified
MAC address entry.
|
|
{ static | dynamic | blackhole
} [ interface interface-type interface-number ] [ vlan vlan-id
] [ count ]
|
Displays information about dynamic,
static, or blackhole MAC address entries.
|
|
interface interface-type
interface-number [ vlan vlan-id ] [ count ]
|
Displays information about the MAC
address entries concerning a specified port.
|
|
vlan vlan-id
[ count ]
|
Displays information about the MAC
address entries concerning a specified VLAN.
|
|
Count
|
Displays the total number of the MAC
address entries maintained by the switch.
|
|
Statistics
|
Displays the statistics of the MAC
address table.
|
mac-address:
MAC address.
static:
Displays static MAC address entries. (A static MAC address entry does not age.)
dynamic:
Displays dynamic MAC address entries. (A dynamic MAC address entry ages with
time.)
blackhole:
Displays blackhole MAC address entries. (A blackhole MAC address entry does not
age.)
interface-type:
Port type.
interface-number: Port number.
vlan-id: VLAN
ID. This argument ranges from 1 to 4094.
count: Displays
only the total number of the MAC address entries.
statistics:
Displays the statistics of the MAC address table.
Description
Use the display mac-address
command to display information about MAC address entries in a MAC address table,
including: MAC address, VLAN and port corresponding to the MAC address, the
type (static or dynamic) of a MAC address entry, aging time and so on.
Example
# Display the information about the MAC
address 000f-e20f-0101.
<H3C> 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
Table 1-2 Description on the fields of the display mac-address
command
|
Field
|
Description
|
|
MAC ADDR
|
MAC address
|
|
VLAN ID
|
ID of the VLAN to which the network
device identified by the MAC address belongs
|
|
STATE
|
The state of the MAC address. The value
of this field can be “Static”, “Learned”, and so on.
|
|
PORT INDEX
|
Port index (including port type and port
number)
|
|
AGING TIME(s)
|
Indicates whether a MAC address entry is
aging
|
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 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, port view
Parameter
static:
Specifies that the MAC address entry to be added/updated is of static type.
dynamic:
Specifies that the MAC address entry to be added/updated is of dynamic type.
blackhole:
Specifies the MAC address entry to be added/updated is of blackhole type.
mac-address:
MAC address.
interface-type:
Port type.
interface-number: Port number.
vlan-id:
VLAN ID. This argument ranges from 1 to 4,094.
mac-address-attribute: String used to specify the MAC address entries to be removed, as
described in Table 1-3.
Table 1-3 Description
on the mac-address-attribute argument
|
Value
|
Description
|
|
{ static | dynamic | blackhole
} interface interface-type interface-number
|
Removes the static, dynamic, or blackhole
MAC address entries concerning a specified port.
|
|
{ static | dynamic | blackhole }
vlan vlan-id
|
Removes the static, dynamic, or blackhole
MAC address entries concerning a specified VLAN.
|
|
{ static | dynamic | blackhole }
mac-address [ interface interface-type interface-number
] vlan vlan-id
|
Removes a specified static, dynamic, or
blackhole MAC address entry.
|
|
interface interface-type
interface-number
|
Removes all the MAC address entries concerning
a specified port.
|
|
vlan vlan-id
|
Removes all the MAC address entries concerning
a specified VLAN.
|
|
mac-address [ interface interface-type interface-number ] vlan
vlan-id
|
Removes a specified MAC address entry.
|
Description
Use the mac-address command
to add/modify a MAC address entry.
Use the undo mac-address
command to remove one or more MAC address entries.
When being executed in port view, these two
commands only apply to the current port. In this case, the interface
keyword is unnecessary.
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 MAC address entries
(unicast MAC addresses only) concerning a specific 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.
Example
# Configure a static MAC address entry with
the following settings:
l
MAC address: 000f-e20f -0101
l
Outbound port: Ethernet1/0/1 port
l
Ethernet1/0/1 port belongs to VLAN 2.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] mac-address static 000f-e20f-0101
interface Ethernet 1/0/1 vlan 2
Syntax
mac-address
max-mac-count count
undo mac-address
max-mac-count
View
Ethernet port view
Parameter
count: Maximum
number of MAC addresses a port can learn. This argument ranges from 0 to 8,192.
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.
l
The uplink ports do not support the above
commands.
l
You can not manually delete a dynamic MAC
address entry of an Ethernet port using undo mac-address dynamic command
after you set the maximum number of MAC addresses it can learn.
Related command: mac-address, mac-address
timer.
Example
# Set the maximum number of MAC addresses
Ethernet1/0/3 port can learn to 600.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] interface Ethernet 1/0/3
[H3C-Ethernet1/0/3] mac-address max-mac-count
600
1.1.5 mac-address timer
Syntax
mac-address timer { aging age | no-aging }
undo mac-address timer aging
View
System view
Parameter
aging age: Specifies the aging time (in seconds) for layer 2 dynamic MAC
address entries. The age argument ranges from 10 to 1000000 and defaults
to 300.
no-aging:
Specifies not to age dynamic MAC address entries.
Description
Use the mac-address timer
command to set the aging time for dynamic MAC address entries.
Use the undo mac-address timer
command to restore the default aging time.
Set the aging time of dynamic MAC address
entries as required but ensure that the aging time does not decrease the layer
2 packet forwarding performance of the switch.
l
If the aging time is 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 time is 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.
Example
# Set the aging time of MAC address entries
to 500 seconds.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] mac-address timer aging 500
