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HP 5500 Ei 5500 Si Switch Series Configuration Guide

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    							 30 
Configuring MAC Information 
Overview 
Introduction to MAC Information 
To monitor a network, you must monitor users who are joining and leaving the network. Because a MAC 
address uniquely identifies a network user, you can monitor users who are joining and leaving a network 
by monitoring their MAC addresses.  
With the MAC Information function, Layer 2 Ethernet ports send Syslog or trap messages to the monitor 
end in the network when they obtain or delete MAC addresses. By analyzing these messages, the 
monitor end can monitor users who are accessing the network.  
How MAC Information works 
When a new MAC address is obtained or an existing MAC address is deleted on a device, the device 
writes related information about the MAC address to th e buffer area used to store user information. 
When the timer set for sending MAC address monitoring Syslog or trap messages expires, or when the 
buffer reaches capacity, the device sends the Syslog or trap messages to the monitor end.  
The device writes information and sends messages  only for the following MAC addresses: automatically 
learned source MAC addresses, MAC addresses that pass MAC authentication, MAC addresses that 
pass 802.1X authentication, MAC addresses matching OUI addresses in the voice VLAN feature, and 
secure MAC addresses. The device does not write  information or send messages for blackhole MAC 
address, static MAC addresses, dynamic MAC addresses that are manually configured, multicast MAC 
addresses, and local MAC addresses. 
For more information about MAC authentication, 802.1X, and secure MAC addresses in port security, 
see  Security Configuration Guide . For more information about voice VLAN and OUI addresses, see 
 Configuring a voice VLAN .
  
Configuring MAC Information 
Enabling MAC Information globally  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enable MAC Information 
globally.  mac-address information enable 
Disabled by default. 
 
Enabling MAC Information on an interface 
To enable MAC Information on an Ethernet interface, enable MAC Information globally first.
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    							 31 
To enable MAC Information on an interface:  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Enter Layer 2 Ethernet 
interface view.  interface 
interface-type 
interface-number   N/A 
3.
  Enable MAC Information on 
the interface.  mac-address information enable 
{
 added  | deleted  }  Disabled by default. 
 
Configuring MAC Information mode  
Step Command Remarks 
1.
  Enter system view. 
system-view  N/A 
2.  Configure MAC Information 
mode.  mac-address information mode
 
{  syslog  | trap }  Optional  
trap by default. 
 
Configuring the interval for sending Syslog or trap messages 
To prevent Syslog or trap messages from being sent 
too frequently, change the interval for sending Syslog 
or trap messages.  
To set the interval for sending Syslog or trap messages: 
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Set the interval for sending 
Syslog or trap messages.  mac-address information interval 
interval-time
  Optional  
One second by default.  
 
Configuring the MAC Information queue length 
To avoid losing user MAC address information, when the buffer that stores user MAC address 
information reaches capacity, the user MAC address information in the buffer is sent to the monitor end 
in the network, even if the timer set for sending MA
C address monitoring Syslog or trap messages has not 
expired yet.  
To configure the MAC Information queue length: 
 
Step Command Remarks 
1.   Enter system view. 
system-view  N/A 
2.  Configure the MAC 
Information queue length.  mac-address information 
queue-length 
value  Optional  
50 by default.
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    							 32 
MAC Information configuration example 
Network requirements 
As shown: 
Enable MAC Information on GigabitEthernet 1/0/1 on Device in  Figure 7 
to send MAC address 
changes in Syslog messages to Host B through GigabitEthernet 1/0/3. Host B analyzes and displays the 
Syslog messages.  
Figure 7  Network diagram 
 
 
Configuration procedure 
1. Configure Device to send Syslog messages to Host B (see  Network Management and Monitoring 
Configuration Guide ). 
2. Enable MAC Information.  
# Enable MAC Information on Device.  
 system-view 
[Device] mac-address information enable 
# Configure MAC Information mode as Syslog.  
[Device] mac-address information mode syslog 
# Enable MAC Information on GigabitEthernet 1/0/1. 
[Device] interface gigabitethernet 1/0/1 
[Device-GigabitEthernet1/0/1] mac-address information enable added 
[Device-GigabitEthernet1/0/1] mac-address information enable deleted 
[Device-GigabitEthernet1/0/1] quit 
# Set the MAC Information queue length to 100.  
[Device] mac-address information queue-length 100 
# Set the interval for sending Syslog or trap messages to 20 seconds.  
[Device] mac-address information interval 20
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    							 33 
Configuring Ethernet link aggregation 
The 5500 SI Switch Series does not support Layer 3 aggregate interfaces. The Layer 3 aggregate 
interface configurations in this document  apply to only the 5500 EI Switch Series. 
Overview 
E t h e r n e t  l i n k  a g g re g a t i o n,  o r  s i m p l y  l i n k  a g g re g a t i o n,  combines multiple physical Ethernet ports into one 
logical link, called an aggregate link. Link aggregation delivers the following benefits:  
•   Increases bandwidth beyond the limits of any single  link. In an aggregate link, traffic is distributed 
across the member ports.  
•   Improves link reliability. The member ports dynamically back up one another. When a member port 
fails, its traffic is automatically switched to other member ports.  
As shown in  Figure 8, D
evice A and Device B are connected by three physical Ethernet links. These 
physical Ethernet links are combined into an aggreg ate link, Link Aggregation 1. The bandwidth of this 
aggregate link is as high as the total bandwidth of the three physical Ethernet links. At the same time, the 
three Ethernet links back up one another.  
Figure 8  Ethernet link aggregation 
 
 
Basic concepts 
Aggregation group, member port, and aggregate interface 
Link aggregation is implemented by combining Ethernet interfaces into a link aggregation group. Each 
link aggregation group has one logical aggregate interf ace. To an upper layer entity that uses the link 
aggregation service, a link aggregation group appear s to be a single logical link and data traffic is 
transmitted through the aggr egate interface. The rate of an aggregate interface equals the total rate of 
its member ports in the Selected stat e, and its duplex mode is the same as the selected member ports. For 
more information about the states of memb er ports in an aggregation group, see Aggregation states of 
member por

ts in an aggregation group . 
Aggregate interfaces are one of the following types: 
Bridge-aggregation (BAGG) interfaces —Also called Layer 2 aggregate interfaces. 
Route-aggregation (RAGG) interfaces —Also called Layer 3 aggregate interfaces.  
When you create an aggregate inte rface, the switch automatically creates an aggregation group of the 
same type and number as the aggregate interf ace. For example, when you create interface 
Bridge-Aggregation 1, Layer 2 aggregation group 1 is automatically created.  
You can assign Layer 2 Ethernet interfaces only to  a Layer 2 aggregation group, and Layer 3 Ethernet 
interfaces only to a Layer 3 aggregation group.
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    							 34 
Aggregation states of member ports in an aggregation group 
A member port in an aggregation group can be in either of the following aggregation states: 
•   Selected: A Selected port can forward user traffic.  
•   Unselected: An Unselected port cannot forward user traffic. 
Operational key 
When aggregating ports, the system automatically as signs each port an operational key based on port 
information such as port rate and duplex mode. Any  change to this information triggers a recalculation 
of the operational key. 
In an aggregation group, all selected member  ports are assigned the same operational key. 
Configuration classes 
Every configuration setting on a port might affect its aggregation state. Port configurations fall into the 
following classes: 
•  Port attribute configurations —Includes port rate, duplex mode, and link status (up/down). These 
are the most basic port configurations.  
•   Class-two configurations— A member port can be placed in Sele cted state only if it has the same 
class-two configurations as the aggregate interface. Class-two configurations made on an 
aggregate interface are automatically synchronized to all its member ports. These configurations 
are retained on the member ports even after the aggregate interface is removed. 
Table 2  Class-two configurations 
Feature   Considerations 
Port isolation
  Whether the port has joined an isolation group
 
QinQ  QinQ enable state (enable/disable), TPID for VLAN tags, outer VLAN tags to be 
added, inner-to-outer VLAN priority 
mappings, inner-to-outer VLAN tag 
mappings, inner VLAN ID substitution mappings  
VLAN  Permitted VLAN IDs, PVID, link type (t
runk, hybrid, or access), IP subnet-based 
VLAN configuration, protocol-based VLAN configuration, VLAN tagging mode  
MAC address learning
 MAC address learning capability
 
 
 NOTE: 
Any class-two configuration change might  affect the aggregation state of link aggregation member ports
and ongoing traffic. To be sure that you are aware  of the risk, the system displays a warning message 
every time you attempt to change a class-tw o configuration setting on a member port. 
 
•  Class-one configurations —Include settings that do not affect  the aggregation state of the member 
port even if they are different from those on th e aggregate interface. GVRP and MSTP settings are 
examples of class-one configurations. The class-one configuration for a member port is effective 
only when the member port leaves the aggregation group. 
Reference port 
When setting the aggregation state of the ports in an aggregation group, the system automatically picks 
a member port as the reference port. A Selected port  must have the same port attributes and class-two 
configurations as the reference port.
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    							 35 
LACP 
The IEEE 802.3ad Link Aggregation Control Protocol (LACP) enables dynamic aggregation of physical 
links. It uses link aggregation control protocol data units (LACPDUs) for exchanging aggregation 
information between LACP-enabled devices.  
1.  LACP functions 
The IEEE 802.3ad LACP offers basic  LACP functions and extended LACP functions, as described 
in  Table 3.  
Table 3  Basic and ext

ended LACP functions 
Cate
gory  Description 
Basic LACP 
functions  Implemented through the basic LA
CPDU fields, including the system LACP priority, system 
MAC address, port aggregation priority, port number, and operational key.  
Each member port in a LACP-enabled aggregation group exchanges the preceding 
information with its peer. When a member po rt receives an LACPDU, it compares the 
received information with the information receiv ed on the other member ports. In this way, 
the two systems reach an agreement on which po rts should be placed in the Selected state.
Extended LACP 
functions
  Implemented by extending the LACPDU with new Type/Length/Value (TLV) fields. This is 
how the LACP multi-active detection (MAD) mech
anism of the Intelligent Resilient Framework 
(IRF) feature is implemented. The 5500 EI[SI] Switch Series can participate in LACP MAD as 
either an IRF member switch or an intermediate device.   
 
For more information about IRF, member switches, intermediate devices, and the LACP MAD mechanism, 
see  IRF Configuration Guide . 
2. LACP priorities 
LACP priorities have the following types: system  LACP priority and port aggregation priority. 
Table 4  LACP priorities 
T
ype Description Remarks 
System LACP 
priority   Used by two peer devices (or systems) to determine which one is 
superior in link aggregation.  
In dynamic link aggregation, the sy
stem that has higher system LACP 
priority sets the Selected state of memb er ports on its side first, and then 
the system that has lower priority sets the port state accordingly.   The smaller the 
priority value, 
the higher the 
priority.  
Port aggregation 
priority 
Determines the likelihood of a member port to be selected on a system. 
The higher the port aggregation priority, the higher the likelihood.  
 
3.
 LACP timeout interval 
The LACP timeout interval specifies how long a member port waits to receive LACPDUs from the 
peer port. If a local member port fails to rece ive LACPDUs from the peer within three times the 
LACP timeout interval, the member port assumes th at the peer port has failed. You can configure 
the LACP timeout interval as either the short timeou t interval (1 second) or the long timeout interval 
(30 seconds). 
Link aggregation modes 
Link aggregation has the following modes: dynamic and static. Dynamic link aggregation uses LACP 
and static link aggregation does not.  Table  5 c
ompares the two aggregation modes.
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Table 5 A comparison between static  and dynamic aggregation modes 
Aggregation 
mode  LACP status on 
member 
ports 
Pros Cons 
Static Disabled  Aggregation is stable. Peers do 
not affect the aggregation state of 
the member ports. The member ports do not adjust the 
aggregation state according to 
that of the peer ports. The 
administrator must manually 
maintain link aggregations.  
Dynamic Enabled 
The administrator does not need to 
maintain link aggregations. The 
peer systems maintain the 
aggregation state of the member 
ports automatically. Aggregation is unstable. The 
aggregation state of the member 
ports is susceptible to network 
changes. 
 
The following points apply to a dynamic link aggregation group: 
•
  A Selected port can receive and send LACPDUs.  
•   An Unselected port can receive and send LACPDUs  only if it is up and has the same class-two 
configurations as the aggregate interface.  
Aggregating links in static mode 
LACP is disabled on the member ports in a static  aggregation group. You must manually maintain the 
aggregation state of the member ports.  
The static link aggregation process comprises: 
•   Selecting a reference port 
•   Setting the aggregation state of each member port 
Selecting a reference port 
The system selects a reference port from the member ports that are: 
•  Are in the up state and have 
•   Have the same class-two configurations as the aggregate interface.  
The candidate ports are sorted by aggregation prio rity, duplex, and speed in the following order:  
•   Lowest aggregation priority value 
•   Full duplex/high speed 
•   Full duplex/low speed 
•   Half duplex/high speed 
•   Half duplex/low speed 
The one at the top is selected as the reference port. If two ports have the same aggregation priority, 
duplex mode, and speed, the one with the lower port number wins. 
Setting the aggregation stat e of each member port 
After selecting the reference port, the static aggregation group sets the aggregation state of each 
member port, as shown in Figure 9. A
fter the static aggregation group has reached the limit on Selected 
ports, any port assigned to the group is placed in  Unselected state to avoid traffic interruption on the 
current Selected ports.
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Figure 9 Setting the aggregation state of a member  port in a static aggregation group 
 
Aggregating links in dynamic mode 
LACP is automatically enabled on all member ports in a dynamic aggregation group. The protocol 
automatically maintains the aggregation state of ports.  
The dynamic link aggregation process comprises: 
•   Selecting a reference port 
•   Setting the aggregation state of each member port 
Selecting a reference port 
The local system (the actor) and the remote system  (the partner) negotiate a reference port using the 
following workflow:  
1.  The systems compare the system ID (which compri ses the system LACP priority and the system 
MAC address). The system with the lower LACP priority value wins. If they are the same, the 
systems compare the system MA C addresses. The system with the lower MAC address wins. 
2. The system with the smaller system  ID selects the port with the smallest port ID as the reference port. 
A port ID comprises a port aggregation priority  and a port number. The port with the lower 
aggregation priority value wins. If two ports have the same aggregation priority, the system 
compares their port numbers. The port with the smaller port number wins.  
Setting the aggregation stat e of each member port 
After the reference port is selected, the system with the lower system ID sets the state of each member port 
in the dynamic aggregation group on its side.  
No
Port attribute/class 2 configurations 
same as the reference port?
More candidate ports than max. number of Selected ports?
Is the port up?
Is there any hardware restriction?
Port number as low as to set 
the port in the Selected state? 
Set the aggregation state 
of a member port
Set the port in the Selected stateSet the port in the Unselected state
Yes
Yes No
Yes No
Yes
No
Yes No
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Figure 10 Setting the state of a member port in a dynamic aggregation group 
 
 
Meanwhile, the system with the higher system ID, which has identified the aggregation state changes on 
the remote system, sets the aggregation state of local member ports as the same as their peer ports. 
A dynamic link aggregation group preferably sets full-duplex ports as the Selected ports, and will set one, 
and only one, half-duplex port as a Selected port when none of the full-duplex ports can be selected or 
only half-duplex ports exist in the group. 
When the aggregation state of a member port change s, the aggregation state of its peer port also 
changes.  
After the Selected port limit has been reached, a  port assigned to the dynamic aggregation group is 
placed in Selected state if it is more eligible  for being selected than a current member port. 
The port assigned to the dynamic aggregation group  after the Selected port limit has been reached is 
placed in Selected state if it is more eligible  for being selected than a current member port. 
Load-sharing criteria for link aggregation groups 
In a link aggregation group, traffic can be load-shar ed across the selected member ports based on a set 
of criteria, depending on your configuration.
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    							 39 
You can choose one of the following criteria or any combination for load sharing: 
•  MAC addresses 
•   Service port numbers 
•   Ingress ports 
•   IP addresses 
Alternatively, you can let the system automatically choose link-aggregation load-sharing criteria based 
on packet types (Layer 2, IPv4,  or IPv6 for example)  
Configuration restrictions and guidelines 
Follow these guidelines when you configure a link aggregation group: 
•   To ensure stable aggregation state  and service continuity, do not change port attributes or class-two 
configurations on any member port. If you must, make sure you understand its impact on the live 
network. Any port attribute or class-two configuration change might affect the aggregation state of 
link aggregation member ports and ongoing traffic. 
Avoid assigning ports to a static aggregation group th at has reached the limit on Selected ports. These 
ports will be placed in Unselected state to avoid traffic interruption on the current Selected ports. 
However, a device reboot can cause the aggregation state of member ports to change. 
Ethernet link aggregation configuration task list 
Complete the following tasks to configure Ethernet link aggregation:  
Task  Remarks 
Configuring an 
aggregation group Configuring a static aggregation group 
Select either task 
Configuring a dynamic aggregation group 
Configuring an 
aggregate interface Configuring the description of an aggregate interface 
Optional 
Configuring the MTU of a Layer 3 aggregate interface  Optional 
Enabling link state traps for an aggregate interface Optional 
Limiting the number of Selected ports for an aggregation 
group Optional 
Shutting down an aggregate interface 
Optional 
Restoring the default settings for an aggregate interface Optional 
Configuring load 
sharing for link 
aggregation groups Configuring load-sharing criteria for link aggregation groups 
Optional 
Enabling local-first load sharing for link aggregation Optional 
Enabling link-aggregation traffic redirection  Optional 
 
Configuring an aggregation group 
You can choose to create a Layer 2 or Layer 3 link aggregation group depending on the ports to be 
aggregated on the 5500 EI switch:  
•  To aggregate Layer 2 Ethernet interfaces, cr eate a Layer 2 link aggregation group.
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