topic spanning-tree portfast bpdufilter default in Network Access Control

spanning-tree portfast bpdufilter default

HiTmAn47 — Fri, 21 Feb 2020 18:52:31 GMT

Hello ,

I want to know the effect on applying the above command globally ,

because I read that it makes any port that have portfast that receives bpdu goes through normal STP stages ( listening , learning , forwarding )

which means that it basically disables portfast .... is that true ?

Re: spanning-tree portfast bpdufilter default

Francesco Molino — Mon, 02 Apr 2018 01:19:25 GMT

Hi

This command prevents portfast interfaces to send and receive bpdus. However, if a bpdu is received on a portfast interface, it will transition to normal stp operational status and disable bpdu filtering on this specific interface.

Re: spanning-tree portfast bpdufilter default

EduardR — Mon, 02 Apr 2018 12:45:21 GMT

Hi,

That command does 2 complementary actions, first, puts all ports on "Portfast", that means that the port does not goes thru the STP process (Blocking, Listen, Learning, Forwarding) but it goes directly to forwarding, but it keeps receiving and sending BPDUs. SO, theres the second part, it puts "BPDU Filter" on all the ports, that means that the port will stops receiving and sending those BPDUs.