STP is the short form for Spanning Tree Protocol & RSTP (Rapid Spanning Tree Protocol), MSTP (Multiple Spanning Tree Protocol) are all. The Spanning Tree Protocol (STP) is a network protocol that builds a loop-free logical topology In , the IEEE introduced Rapid Spanning Tree Protocol ( RSTP) as w. .. Cisco developed, implemented and published the Per- VLAN Spanning Tree (PVST) proprietary protocol using its own proprietary Inter- Switch. This lesson explains what is Rapid Spanning Tree Protocol (RSTP) Tutorials and Cisco enhanced the original Spanning Tree Protocol (STP) IEEE D.

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When a host is attached, such as a computer, printer or serverthe port always goes into the forwarding state, albeit after a delay of about 30 seconds while it goes through the listening and learning states see below. The number of states a port can be in has been reduced tutodial three instead of STP’s original five. Full Access to our Lessons.

Spanning Tree Protocol – Wikipedia

Each of these MSTI configuration messages conveys the spanning ciscp information for each instance. Transition speed convergence time is the most important feature of rapid spanning tree. Rapid spanning-tree works differently…all switches generate BPDUs every two seconds hello time. This is the root port. The need for the Spanning Tree Protocol STP arose because switches in local area networks LANs are often interconnected using redundant links to improve cieco should one connection fail.


This agreement is a copy of the proposal BPDU where the proposal bit has been switched off and the agreement bit is switched on.

A Multi chassis link aggregation works like a normal LACP trunkonly distributed through multiple switches. By using this site, you agree to the Terms of Use and Privacy Policy.

RSTP converges with all ports either in forwarding state or discarding state. Rapid spanning-tree only has three port states:.

Understanding Spanning Tree Protocols – STP, RSTP, MSTP

Only the root bridge generated BPDUs in the classic spanning-tree and those were relayed by the non-root switches if they received it on their root port. A nice little flash tutorial about STP, made by Cisco: Blocking ports will only receive BPDUs. Verify your configuration on SW1. Subsequent versions were published in [17] and[18] incorporating various extensions.

The idea of blocking links is something that customers these days do not accept as a proper high availability solution. A new solution from an old technology”. Network protocols Link protocols Network topology Spanning tree Fault-tolerant computer systems Ethernet standards.

You are very unlikely to see this port on a production network though. Root bridge is selected based on high bridge priority lowest value. Retrieved 19 April Explained As Simple As Possible.

SW1 as a root bridge will always have the best ports so all of interfaces will be designated. I had read multiple documents to understand the RSTP concepts but still I have multiple questions to get clarity. Spanning tree is an older protocol with a longer default hold-down time that governs convergence of the protocol state. It is with reference to the Root Switch that all the other switches determine their best cost path.


This command is executed from global configuration mode and manually sets the bridge priority per vlan on a switch. Hello florian No problem!

If the root switch fails, all tstp other switches repeat the election process and select a new root switch, from the available switches. There are two restrictions to the compatibility of VSTP:.

SPB allows redundant links between switches to be active through multiple equal cost paths, and provides much larger layer 2 topologies, faster convergence, and improves the use of the mesh topologies through increased bandwidth between all devices by allowing traffic to load share across all paths on a mesh network.

Simple and straight forward explanation: They are connected and kept inactive by STP, so that, when the best path fails — the next best path can be achieved by activating the blocked links.

This provides for both link redundancy and switch redundancy in the network.