P802.1AX-Rev – Link Aggregation Revision

The full title of this PAR is “Standard for Local and Metropolitan Area Networks – Link Aggregation”. This is a revision of 802.1AX-2014.

Link Aggregation provides protocols, procedures, and managed objects that allow the following: One or more parallel instances of full-duplex point-to-point links to be aggregated together to form a Link Aggregation Group (LAG), such that a MAC Client can treat the LAG as if it were a single link. A resilient interconnect using multiple full-duplex point-to-point links among one to three nodes in a network and one to three nodes in another, separately administered, network, along with a means to ensure that frames belonging to any given service will use the same physical path in both directions between the two networks. This standard defines the MAC-independent Link Aggregation capability and general information relevant to specific MAC types that support Link Aggregation. The capabilities defined are compatible with previous versions of this standard.

Link Aggregation allows the establishment of full-duplex point-to-point links that have a higher aggregate bandwidth than the individual links that form the aggregation, and the use of multiple systems at each end of the aggregation. This allows improved utilization of available links in bridged local area network (LAN) environments, along with improved resilience in the face of failure of individual links or systems. In applications connecting separately administered networks, the networks are isolated from each other’s fault recovery events.

There is a need to correct and clarify Link Aggregation specifications and in particular the Distributed Resilient Network Interface specifications, in the light of implementation experience to ensure interoperability and ensure proper operation. Furthermore there is a need to correct some known problems identified in the maintenance process. The scope of these changes is most appropriately handled as a revision.

Current Status

Status Second TG ballot forthcoming on draft 0.2
Current Draft D0.1 (17 May 2017)
PAR & CSD Full title: Standard for Local and Metropolitan Area Networks-Bridges and Bridged Networks-Link Aggregation
PAR approved 12 May 2016; no CSD
Editor Stephen Haddock
Editor Jessy Rouyer


Date Document
17 Jan 2017 802.1AX-Rev, Draft 0.0
17 Jan 2017 802.1AX-Rev, Draft 0.0 with changebars
17 May 2017 802.1AX-Rev, Draft 0.1
10 Jul 2017 802.1AX-Rev, Draft 0.1 proposed comment dispositions
13 Jul 2017 802.1AX-Rev, Draft 0.1 proposed comment dispositions


Date Document
16 Mar 2016 Standard for Local and metropolitan area networks — Link Aggregation PAR — John Messenger
1 Jan 2017 Plans for next Editor’s draft — Stephen Haddock
10 Jan 2017 LACP Wait To Restore specification — Mick Seaman
16 Mar 2017 Link Aggregation Simulator — Stephen Haddock
15 May 2017 802.1AX Link Aggregation 802.1AX-Rev2-d0.1 Editor’s Report — Stephen Haddock
15 May 2017 802.1AX Link Aggregation: Conversation Sensitive Collection and Distribution (CSCD) — Stephen Haddock
6 Jul 2017 The LACP MUX machine — Mick Seaman
12 Jul 2017 802.1AX — Link Aggregation: Editor’s Report: July 2017 — Stephen Haddock
7 Sep 2017
9 Nov 2017