STP is cisco proprietary protocol or open standard

[patelabhishek]

Hello all,

Is STP a cisco proprietary or an open source protocol????

I searched it on google but i ain't satisfied with the answers i got.

THANKS!!!!!

[Georg Pauwen]

Hello,

STP is just the overall term. IEEE has a couple of open source STP implementations, such as MSTP and RSTP. Cisco has its own, such as PVST, PVST+, and PPVST+. So to answer your question, it all depends on what type of STP you are looking at.

from the link below:

'There are many types of STP variants. Some of them are Cisco proprietary, some of them are standardized by IEEE.

Cisco’s proprietary variants are Per-VLAN Spanning Tree Protocol (PVST), Per-VLAN Spanning Tree Protocol Plus (PVST+) and Rapid PVST+.

IEEE’s standards are Rapid Spanning Tree Protocol (RSTP) and Multiple STP (MSTP).'

https://www.certificationkits.com/spanning-tree-protocol-stp-part-ii/

[MHM Cisco World]

Protocol Standard Resources Needed Convergence STP Tree Calculation

STP	IEEE 802.1D	Low	Slow	All VLANs
PVST+	Cisco	High	Slow	Per VLAN
RSTP	IEEE 802.1w	Medium	Fast	All VLANs
Rapid PVST+	Cisco	High	Fast	Per VLAN
MSTP (MST)	IEEE 802.1s, Cisco	Medium or high	Fast	Per instance

you can see from table above that PVST+  and R-PVST+ it list under standard cisco not IEEE that meaning it cisco proprietary.