LACP mac addrss ?

The link aggregation combine a couple of physical links to a logic link. but which mac address is used for the LACP group?

TIA, st

Reply to
aaabbb16
Loading thread data ...

LACP is a link-constrained protocol, i.e., LACP frames never leave the single physical link on which they are sent. Therefore, the MAC addresses used in LACP frames are the physical addresses of the individual ports, as opposed to the MAC address of an aggregated group of ports.

-- Rich Seifert Networks and Communications Consulting 21885 Bear Creek Way (408) 395-5700 Los Gatos, CA 95033 (408) 228-0803 FAX

Send replies to: usenet at richseifert dot com

Reply to
Rich Seifert

Bear Creek Way

Two questions over here:

  1. Some NICs such as Broadcom NIC support LACP, To send /receive user data (upper layer), I think that it should use one MAC address for this logic link. if so, which port address for this the logic link? primary port? ( logic link should has one primary port and mutiple member ports)

  1. For talking between two logic links(local and far end) to sync this login link on both side, every port send LACP frame to partner use it own physical link MAC address. Does your answer mean this?

Reply to
aaabbb16

5 Bear Creek Way

Yes, from the perspective of higher-layer protocols, the aggregation appears as a single MAC with a single MAC address. The MAC address of the aggregation can be any valid address, but by convention it is the MAC address of the physical port that has the lowest value when treated as a 48-bit number (similar to how the Root Port is determined in the Spanning Tree Protocol).

There is no concept of "primary port" or "member port" in Link Aggregation.

Yes.

-- Rich Seifert Networks and Communications Consulting 21885 Bear Creek Way (408) 395-5700 Los Gatos, CA 95033 (408) 228-0803 FAX

Send replies to: usenet at richseifert dot com

Reply to
Rich Seifert

Cabling-Design.com Forums website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.