HP 5500 Ei 5500 Si Switch Series Configuration Guide

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Task Command Remarks 
Display information about 
loopback interfaces. display interface
 [ loopback ] [ brief  [ down ] ] [ | 
{  begin |  exclude  | include  } regular-expression  ] 
display interface  loopback  interface-number  [ brief  ] 
[ |  { begin |  exclude | include  } regular-expression ]  Available in any view 
Display information about 
the null interface.  display interface
 [ null ] [ brief  [ down  ] ] [ | { begin  | 
exclude  | include  } regular-expression  ] 
display interface...

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Bulk configuring interfaces 
You can enter interface range view to bulk configure multiple interfaces with the same feature instead of 
configuring them one by one. For example, you can perform the  shutdown command in interface range 
view to shut down a range of interfaces.  
Failure of applying a command on one member interface does not affect the application of the command 
on the other member interfaces. If applying a command on one member interface fails, the system 
displays an error message...

 22 
Configuring the MAC address table 
This feature covers only the unicast MAC address table. For information about configuring static multicast 
MAC address table entries for IGMP snooping and MLD snooping, see  IP Multicast Configuration Guide.  
The MAC address table can contain only Layer 2 Et hernet ports and Layer 2 aggregate interfaces. 
The MAC address table configuration tasks are all optional can be performed in any order. 
Overview 
To reduce single-destination packet flooding in a sw itched...

 23 
Types of MAC address table entries 
A MAC address table can contain the following types of entries: 
•   Static entries —Manually added and never age out. 
•   Dynamic entries —Manually added or dynamically obtained, and might age out. 
•   Blackhole entries —Manually configured and never age out. Blackhole entries are configured for 
filtering out frames with specific source or de stination MAC addresses. For example, to block all 
packets destined for a specific user for security concerns, you can...

 24 
Adding or modifying a static or dynamic MAC address table 
entry in interface view 
 
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter Layer 2 Ethernet 
interface view or Layer 2 
aggregate interface 
view.  interface 
interface-type 
interface-number   N/A 
3.
  Add or modify a static or 
dynamic MAC address 
entry.  mac
-address  { dynamic  | static  } 
mac -address  vlan vlan -id   Make sure that you have created the 
VLAN and assigned the interface to the 
VLAN....

 25 
Step Command Remarks 
3.  Enter interface 
view or port group 
view. 
• Enter Layer 2 Ethernet interface 
view or Layer 2 aggregate 
interface view:  
interface  interface-type 
interface-number 
•  Enter port group view:  
port-group  manual 
port-group-name
 
Use either command. 
Settings in Layer 2 Ethernet interface view 
or Layer 2 aggregate interface view take 
effect on the interface only. Settings in 
port group view take effect on all member 
ports in the port group. 
4.   Disable MAC...

 26 
Step Command Remarks 
2.  Configure the aging 
timer for dynamic 
MAC address entries.  mac-address timer
 
{  aging  seconds  | 
no-aging  }  Optional 
300 seconds by default. 
The 
no-aging  keyword disables the aging timer.  
 
You can reduce flooding on a stable network by di sabling the aging timer to prevent dynamic entries 
from unnecessarily aging out. By reducing flooding, you improve not only network performance, but also 
security, because you reduce the chances that a  data packet will...

 27 
Figure 4 MAC address tables of devices when Client A associates with AP C 
 
 
If Client A roams to AP D, Device B learns the MAC address of Client A and advertises it to Device A to 
ensure service continuity for Client A, as shown in Figure 5.  
Figure 5  MAC address tables of devices wh en Client A roams to AP D 
 
 
To enable MAC address roaming:  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enable MAC address 
roaming.  mac-address mac-roaming enable Disabled by default.   

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Displaying and maintaining MAC address tables 
 
Task Command Remarks 
Display MAC address table 
information. display mac-address
 [ mac-address  [ vlan vlan-id  ] | 
[ [ dynamic  | static  ] [ interface  interface-type 
interface-number  ] | blackhole ] [ vlan vlan-id  ] 
[ count ] ] [ |  { begin |  exclude |  include } 
regular-expression  ]  Available in any view 
Display the aging timer for 
dynamic MAC address 
entries. 
display mac-address aging-time
 [ | { begin | 
exclude  | include  }...

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Configuration procedure 
# Add a static MAC address entry. 
 system-view 
[Sysname] mac-address static 000f-e235-dc71 interface gigabitethernet 1/\
0/1 vlan 1 
# Add a blackhole MAC address entry.  
[Sysname] mac-address blackhole 000f-e235-abcd vlan 1 
# Set the aging timer for dynamic MAC address entries to 500 seconds. 
[Sysname] mac-address timer aging 500 
# Display the MAC address entry for port GigabitEthernet 1/0/1. 
[Sysname] display mac-address interface gigabitethernet 1/0/1 
MAC ADDR...