DELL PC7024 User Manual

Port Channel Commands

Care must be taken while enabling this type of configuration. If the Partner 

System is not 802.3AD compliant or the Link Aggregation Control protocol is 

not enabled, there may be network instability. Network instability occurs 

when one side assumes that the members in an aggregation are one single 

link, while the other side is oblivious to this aggregation and continues to 

treat the 'members' as individual links. 
In the PowerConnect system, the Actor System waits for 3 seconds before 

aggregating manually.  The 3 second wait time is specified by the protocol 

standard. 
If a manual LAG member sees an LACPDU that contains information 

different from the currently configured default partner values, that particular 

member drops out of the LAG. This configured member does not aggregate 

with the LAG until all the other active members see the new information. 

When each of the other active members sees the new information, they 

continue to drop out of the LAG. When all the members have dropped out of 

the LAG, they form an aggregate with the new information.

A static LAG is no different from a dynamically configured LAG. All the 

requirements for the member ports hold true (member ports must be 

physical, same speed, and so on). The only difference is this LAG has an 

additional parameter static which makes this LAG not require a partner 

system to be able to aggregate it's member ports. 
A static LAG does not transmit or process received LACPDUs, that is, the 

member ports do not transmit LACPDUs and all the LACPDUs it may 

receive are dropped. A dropped counter is maintained to count the number of 

such PDUs. 
Configured members are added to the LAG (active participation) 

immediately if the LAG is configured to be static. There is no wait time 

before we add the port to the LAG. 

2CSPC4.XCT-SWUM2XX1.book  Page 623  Monday, October 3, 2011  11:05 AM