netdev - Distributed Switch Architecture(DSA)

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Date:	Fri, 18 Jun 2010 09:06:52 +0200
From:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
To:	Lennert Buytenhek <buytenh@...tstofly.org>, netdev@...r.kernel.org
Subject: Distributed Switch Architecture(DSA)

I am trying to wrap my head around DSA and I need some help.

Assume the example from Lennert:

		 +-----------+       +-----------+
		 |           | RGMII |           |
		 |           +-------+           +------ 1000baseT MDI ("WAN")
		 |           |       |  6-port   +------ 1000baseT MDI ("LAN1")
		 |    CPU    |       |  ethernet +------ 1000baseT MDI ("LAN2")
		 |           |MIImgmt|  switch   +------ 1000baseT MDI ("LAN3")
		 |           +-------+  w/5 PHYs +------ 1000baseT MDI ("LAN4")
		 |           |       |           |
		 +-----------+       +-----------+

If I understand this correctly I get at least 5 virtual I/Fs corresponding
to WAN, LAN1-4, but how is the RGMII I/F modelled?
I guess I will have one "real" ethX I/F which maps to RGMII but do I get one
virtual I/F too?
What use are these virtual I/Fs? Just to read status from the corresponding
ports? Can one TX and RX network pkgs over these I/Fs too?

Now I want to add STP/RSTP to the switch. How would one do that?

 Jocke

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