HP 5500 Ei 5500 Si Switch Series Configuration Guide

 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...

 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
 
{...

 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...

 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...

 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...

 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...

 36 
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...

 37 
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...

 38 
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...

 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...