AM335x spanning tree protocol support in CPSW

Marco Contenti

"Spanning tree support" is listed in the features of the Ethernet subsystem in the AM335x technical reference manual (Para. 1.4.1.1) but this is the only point where it is mentioned. In which way does the Ethernet subsystem support the spanning tree protocol (802.1d)? I know there is an easy answer (under LInux) by configuring the adapter as Dual MAC and then bridge the two adapters, but this may apply to any two bridged network adapters. I would rather use the CPSW as a switch with a single MAC. How should I configure the CPSW registers in order to support this feature?

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi Marco,

Please check this thread: https://e2e.ti.com/support/arm/sitara_arm/f/791/t/386404

0 Marco Contenti over 10 years ago in reply to Biser Gatchev-XID

Prodigy 40 points

Thanks for the prompt response,

Biser Gatchev-XID said:

Please check this thread: https://e2e.ti.com/support/arm/sitara_arm/f/791/t/386404

This is the statement of a problem (not answered though) quite similar to mine. The only difference is that they want to use RSTP rather than plain STP. I already read that post and thought that STP could be better supported than RSTP, since it is mentioned in the manual.

0 Biser Gatchev-XID over 10 years ago in reply to Marco Contenti

TI__Guru**** 393215 points

I have asked the person who answered on that thread to comment here too.

0 Schuyler Patton over 10 years ago in reply to Biser Gatchev-XID

TI__Mastermind 41290 points

The cpsw switch is not capable of processing or generating BPDU packets necessary for either protocol. These packets in the case of STP have to come from the Linux kernel for example or they may come a user level daemon for RTSP.

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AM335x spanning tree protocol support in CPSW