3com S7906E 설치 설명서

 

1-8 

Configure the 
aggregation group to 
work in dynamic 
aggregation mode 

Required 

By default, an aggregation group 
works in static aggregation 
mode.  

Exit to system view 

— 

Enter Layer 2 Ethernet 
interface view 

interface interface-type 
interface-number 

Assign the Ethernet 
interface to the 
aggregation group 

port link-aggregation group 
number 

Required 

Repeat the two steps to assign 
multiple Ethernet interfaces to 
the aggregation group.  

Assign the port a LACP 
priority 

lacp port-priority port-priority 

Optional 

By default, the LACP priority of a 
port is 32768.  

Changing the LACP priority of a 
port may affect the 
selected/unselected state of the 
ports in the dynamic aggregation 
group.  

 

z 

Removing a dynamic aggregate interface also removes the corresponding aggregation group. At 

the same time, the member ports of the aggregation group, if any, leave the aggregation group.  

z 

To guarantee a successful dynamic aggregation, ensure that the peer ports of the ports 

aggregated at one end are also aggregated. The two ends can automatically negotiate the selected 

state of the ports.  

z 

When a load-sharing aggregation group becomes a non-load-sharing aggregation group because 

of insufficient load sharing resources, one of the following problems may occur: the number of 

selected ports of the actor is inconsistent with that of the partner, which may result in incorrect 

traffic forwarding; the peer port of a selected port is an unselected one, which may result in 

upper-layer protocol and traffic forwarding anomalies. You should fully consider the situation when 

making configuration.  

 

The S7900E series switches support cross-card link aggregation, namely the member ports of the 

aggregation group locate on different cards. One problem with cross-card link aggregation is that the 

outgoing port for a packet and the incoming port for the reply to the packet may reside on different cards. 

If this occurs, the outgoing port will never learn the source MAC address in the reply packet, and all 

subsequent packets to the same destination will be flooded as unknown unicast packets. To improve 

forwarding efficiency, an automatic MAC address table synchronization mechanism must be used 

between line cards.  

For cards of the same type, synchronization is performed automatically and requires no administrative 

interference. For link aggregation across different types of cards, however, you may need to enable