Link Aggregation Group (LAG) Support for Audio Video Bridging (AVB)

This feature completes the capability to use Link Aggregation Group (LAG) ports with Audio Video Bridging (AVB) by adding support for LAG ports with Multiple Stream Reservation Protocol (MSRP).

This feature adds two modes for how MSRP calculates the available bandwidth of a LAG for use in making stream reservations:
  • Single-port mode simply provides link redundancy and the LAG effective bandwidth is the same as the bandwidth of a single member port.
  • Cumulative mode allows bandwidth aggregation and the LAG effective bandwidth is set to a configurable percent of aggregate bandwidth of the member ports in the LAG. This feature also adds generalized Precision Time Protocol (gPTP) configuration support at the LAG level. Only the LAG master port need be specified when making gPTP configurations. However, the protocol is still running on each member port at the physical port level.

Supported Platforms

Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X620, X440-G2 series switches

Changed CLI Commands

show msrp ports {port_list} detail

For the preceding command, with LAG support, the port speed is replaced with “effective speed”. For physical ports, the effective speed is equivalent to the port speed (shown in bold).

Port  Enabled   Oper  Effectv  Dplx  Jumbo  Jumbo  Cls  Bndry   State   Sr-Pvid 
                               Speed               Size               App/Reg 
----  -------  ------  ------  ----  -----  -----  ---  -----  -------  ------- 
*2g   Y        Up       150 M  Full  N       9216  A    N      QA/IN          2 
                                                   B    N      QA/IN          2 
*48   Y        Up      1000 M  Full  N       9216  A    N      QA/IN          2 
                                                   B    N      QA/IN          2 

With the detail option, and if the port is a LAG, additional information appears:

Load sharing ports: 
                    Port     Port         BW Mode       Percentage 
                    ----     ------     -----------     ---------- 
                    *2g      200 M      Cumulative       40%