STP is the short form for Spanning Tree Protocol & RSTP (Rapid Spanning shed some light on the differences between PVST and RPVST?. and fault-tolerance. STP, RSTP, PVST, and MST are all spanning tree protocols w What’s the difference between MSTP and OTN? Views · Are STP. To prevent loop between switches, Cisco uses Spanning-Tree protocol. STP is the The only difference here is using in Vlan instead of STP. The delay in.

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If either L1 or L2 links fail, this link L3 automatically gets activated. Characteristics of the Spanning Tree Protocols 3. These conditions are different for edge ports and non-edge ports. It forwards data frames and sends and receives BPDU frames. On the root bridge, all ports are designated ports no root ports. There have been several implementations of STP.

It selects the designated port on each segment. Figure Link Types. Point-to-point —A port operating in full-duplex mode typically connects a switch to a switch and is a candidate for a rapid transition to a forwarding state. Default priority of switch is and is multiple of between while, default port-priority in switch is and multiple of Then, we have selection between switch B and C, as we mentioned, switch B has the lowest Mac-Address, so it becomes Designated port and in switch C connection will be blocked.

This situation creates a loop. Designated ports are normally in the forwarding state and forwarding traffic for the segment. However, only one version can be active at any time. It means, we have to wait at least 50 seconds until fully convergence. It makes the remaining ports in the switched network alternate ports. The spanning tree is determined through the information learned by the exchange of the BPDU frames between the interconnected switches.


Network loops sometimes happen inadvertently, especially in large networks. Depending on what is attached to each port, two different link types can be identified:.

Therefore, switch A becomes root bridge and switch B and C use their shortest path to reach root bridge.

Varieties of Spanning Tree Protocols () > STP

This is accomplished by configuring one switch to be elected the root bridge for half of the VLANs in the network and a second switch to be elected the root bridge for the other half of the VLANs. They are connected and kept inactive by STP, so that, when the best path fails — the next best path rxtp be achieved by activating the blocked links. These enhancements, such as BPDUs carrying and sending information about port roles only to neighboring switches, require no additional configuration and generally perform better than the earlier Cisco sfp versions.

The loop guard feature makes additional checks. A network professional whose duties include switch administration may be required to decide which type of spanning-tree protocol to implement.

Most parameters have been left unchanged, so users who are familiar with STP can easily configure the new protocol. Rspt disables links which are not elements of the tree and leaves a single active path between two network devices. Blocking — happens when the port was blocked to stop a looping condition.


It also creates a network design to include redundant links as automatic backup paths in case of active link failures. RSTP is the preferred protocol for preventing Layer 2 loops in a switched network environment.

RSTP also has four port states which are the following: When you enable PortFast on the switch, spanning tree places ports in the forwarding state immediately, instead of going through the listening, learning, and forwarding states.

If it is not selected manually, the switches will themselves elect a root switch. Begween a port is in the blocking state, it does not forward traffic, but it can still process received BPDU messages. Setup Router-on-a-Stick Layer 2 -Layer 3. Figure shows examples of ports that can be configured as edge ports. The designated port which is the intended port for every LAN segment.

Difference Between RSTP and PVST

Shared —A port operating in half-duplex mode connects a switch to a hub that attaches multiple devices. This is problematic only if a large number of VLANs are configured. RSTP redefines the types of ports and their states. Listens for the path to the root. Please check back later. Cisco enhanced the original RSTP has a collection of different ports, namely: The Root Switch is the Central betweeh Switch.