06-07-2007 12:03 PM - edited 03-05-2019 04:34 PM
Hi,
I am looking for a document on cisco.com (or other) which explains *in detail* when does a port transitions from forwarding into listening or from blocking into listening, for both STP and RSTP.
Thanks,
Navid
06-07-2007 10:19 PM
Here is a document for RSTP:
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml
This one could also help for STP.
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a0080094797.shtml
But there are alos other documents available on cisco.com. Just use the Search function
Yves
06-08-2007 12:40 AM
Thanks Yves.
I did read these doc, but didn't find the exact answer to my question.
So I will try to give the answer myself : if somebody could correct me, I would appreciate.
For STP :
1/ A port will transition from BLOCKING into listening when mac_age expires:
a/ if it has not received any bpdu
b/ or if all bpdu received are inferior to the one it usually receives
2/ A DESIGNATED port will transition from forwarding into listening when mac_age expires :
a/ only if it receives a bpdu better than the one it usually sends out
3/ A ROOT port (called r) will transition from forwarding into listening when mac_age expires if :
a/ if it has not received any bpdu from the root switch
b/ or if any other port of this switch receives a bpdu superior to the one sent by the current root to this port (r)
Thanks,
Navid
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide