RSTP Edge Port?

uberdome
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RSTP Edge Port?

Fri May 07, 2021 11:32 am

How do you configure a port as an RSTP edge port?

I only see the ability to enable or disable RSTP. I'd like to enable edge ports on customer-facing connections.

Thank you, Chris

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mike99
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Re: RSTP Edge Port?

Fri May 07, 2021 12:52 pm

You should never enable STP on customer facing port. Use broadcast detection instead.

BTW, edge port mode don't add protection to STP, it only allow to pass over the learning state when port is enable to allow faster forwarding.
https://www.cisco.com/c/m/en_us/techdoc ... -edge.html

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Re: RSTP Edge Port?

Fri May 07, 2021 1:01 pm

I suppose I will have to read further. I thought RSTP edge ports are supposed to shut down ports if they receive any PBDU packets, and that this was an appropriate way to prevent issues on a customer-facing port. I will check into it further.

Where is "broadcast detection" configured? I don't see it in my interface.

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mike99
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Re: RSTP Edge Port?

Fri May 07, 2021 1:10 pm

You mean BPDU guard. You can simply disable STP on port facing the customer and it will protect you without shutting the port. It will simply drop BPDU on this port.

Storm control is globally turn on/off on the Device tab - Configuration submenu

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Re: RSTP Edge Port?

Fri May 07, 2021 1:17 pm

Thank you for the clarification. Looking at RSTP documentation further, I see "edge ports" are really just ports that might eventually connect to something communicating via RSTP (rather than intentionally stopping it).

It looks like with RSTP currently disabled on customer / AP ports, I am already configured appropriately. I'll have a look at the storm control settings.

Thank you, Chris

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