IEEE Standards Interpretations for IEEE Std 802.1AX™-2008 IEEE Standard for Local and Metropolitan Area Networks - Link Aggregation
Copyright © 2010 by the Institute of Electrical and Electronics Engineers, Inc. Three Park Avenue New York, New York 10016-5997 USA All Rights Reserved.
Interpretations are issued to explain and clarify the intent of a standard and do not constitute an alteration to the original standard. In addition, interpretations are not intended to supply consulting information. Permission is hereby granted to download and print one copy of this document. Individuals seeking permission to reproduce and/or distribute this document in its entirety or portions of this document must contact the IEEE Standards Department for the appropriate license. Use of the information contained in this document is at your own risk.
IEEE Standards Department Copyrights and Permissions 445 Hoes Lane, Piscataway, New Jersey 08855-1331, USA
Interpretation Request #1
In the above mentioned Standard and clause, what does maximizing link aggregation mean? Does it refer to the following scenario?
- There are two peers connected to a device and LACP is configured between the device and peer1, say with 4 links.
- If the links are dynamically removed from peer1 one by one and attached to peer2, say 3 links, LACP should aggregate the device and peer2.
Thus, the peer with more number of links to the 16 March 2010 device should have an active LACP group and the other peer session with say one link should get deactivated?
The interpretation request raises two questions:
- What is meant by "maximizing link aggregation"? and
- What is the relationship between link aggregation groups between a system and two different peers?
The note in 5.3 regarding maximizing link aggregation means that if a link aggregation group is configured between a system and a peer then a link between the system and that peer will automatically be added to the link aggregation group if it is useable (unless explicitly prohibited by management). This tends to maximize the set of links in the link aggregation group to that peer.
There is no relationship between link aggregation groups to different peers. That is, the addition of a link to peer 2 has no impact on the link aggregation group between the system and peer 1. Similarly, the number of links in an aggregation group to peer 2 has no impact on the operation of a link aggregation group to peer 1.