What is STP and how does it work? The Spanning Tree Protocol STP is responsible for identifying links in the network and shutting down the redundant ones, preventing possible network loops. In order to do so, all switches in the network exchange BPDU messages between them to agree upon the root bridge. Mui Bruntrager Explainer.
What is a Bpdu packet? Acronym for bridge protocol data unit. BPDUs are data messages that are exchanged across the switches within an extended LAN that uses a spanning tree protocol topology. BPDU packets contain information on ports, addresses, priorities and costs and ensure that the data ends up where it was intended to go. Balde Christoffer Explainer. How does STP maintain a loop free network?
As the name implies, STP , spans all switches in a network or subnet. The STP algorithm is responsible for identifying active redundant links in the network and blocking one of these links, thus preventing possible network loops. Adalid Fairley Explainer. Spanning-Tree Protocol STP is a link management protocol that provides path redundancy while preventing undesirable loops in the network.
Devala Janitschke Pundit. What does Bpdu guard do? Connecting switches to PortFast-enabled ports can cause Layer 2 loops or topology changes.
Zhiyi Froim Pundit. How is root bridge elected in STP? All switches exchange BPDU in order to elect root bridge. The switch with the lowest Bridge I'd will become the root bridge. If there is a tie on bridge priority then the Base Mac address is considered. Bridge Priority — It is priority, which is assigned to every switch, by default. Carolyn Molodyh Pundit. What is a root switch? The Root bridge switch is a special bridge at the top of the Spanning Tree inverted tree.
The branches Ethernet connections are then branched out from the root switch , connecting to other switches in the Local Area Network LAN.
All Bridges Switches are assigned a numerical value called bridge priority. Benno Warbichler Pundit. July 7, at pm. April 8, at am. It is very easy to understand dthe difference between both. April 9, at pm. Mohammed says:. May 10, at am. Thanks in adv….. June 9, at pm. Subashgandhi says:. July 15, at am. Fulvio Allegretti says:. July 18, at pm.
Suresh Babu K. September 5, at pm. Thirupathi Angaiah says:. November 1, at am. TechRecur says:. November 4, at am. Jose Gomez says:. December 21, at pm. December 22, at pm. December 23, at am. Augustino Mlinga says:. January 27, at am. John says:. April 19, at am. June 8, at pm. Manjit R says:. August 9, at pm. M sterBl ster says:. August 17, at pm. Good stuff! Sivasamy V says:. August 24, at am.
Tej says:. April 29, at pm. May 1, at pm. The closest analogy I can think about is the following: we can all take different roles in a company: employee, manager, engineer, CIO, CFO… and each one pass through different states condition cycle sleeping, working, resting,… Each port can be be elected for one role depending on the topology: Roles: Root port Designated port.
I hope this clarifies the conceptual difference between states and roles. May 8, at am. Kiran says:. August 30, at am. Vipin says:. April 3, at am. Matthew Farrenkopf says:. In STP, if the topology changes either because of a new link added or a link lost, it can take anywhere between 30 to 50 seconds in order to adapt to the new topology and provide the least cost path.
With RSTP, that is reduced to three hello times, which has a default value of 2 seconds for a total of 6 seconds. The ability to adapt new topologies is very advantageous especially when dealing with high volume traffic in order to avoid lost packets. This enables an RSTP bridge to provide spanning tree information to its ports.
If the receiving bridge recognizes that the information it receives is superior, it will then send an agreement to the sending bridge. Cite APA 7 , l. Difference Between Similar Terms and Objects. MLA 8 , lanceben.
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