Posted on March 27, 2019


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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Do you remember portfast? Very few switches from other vendors support Cisco’s various proprietary protocols. Alternative Port and Tutorisl Port are in discarding state. Switch A is Root Bridge. Network Resources Free Router Simulators. Rapid Spanning Tree P P P P P HelloPlease help. Some bridges implement both the IEEE and the DEC versions of the Spanning Tree Protocol, but their interworking can create tutoria, for the network administrator, as illustrated by the problem discussed in an on-line Cisco document.

I have one doubt, Can you please confirm me whether root bridge is selected on basis of high bridge priority or low bridge priority.

What is Rapid Spanning Tree Protocol (RSTP)

Take a look at the picture below:. It’s put into Forwarding mode while all other ports on the root bridge on that same LAN segment become non-designated ports and are put into blocking mode. Fundamentals of Communications and Networking. If no Spanning Tree Protocol is applied in this scenario, tutorjal would be looping of data and hence broadcast congestion in the network.


When a device is first attached to a switch port, it will not immediately start to forward data. But if Tutprial enabled switches are employed, the link L3 is effectively blocked from transmitting any data. If all ports of a switch have the same priority, the port with the lowest number is chosen to forward frames.

Once SW2 has its interfaces in sync mode it will let SW1 tutoriql about this by sending an agreement. Ask a question or join the discussion by visiting our Community Forum.

One big disadvantage of STP is the low convergence which is very important in switched network. Rapid spanning-tree works rztp switches generate BPDUs every two seconds hello time.

Rapid Spanning-Tree (RSTP)

To have two links to the same collision domain, the switch must be attached to a hub. When SW2 receives the proposal it has to do something with it:. To configure switches to run the rapid spanning-tree protocol by executing the spanning-tree mode rapid-pvst in global configuration mode as shown below. The basic function of STP is to prevent bridge loops and the broadcast radiation that results from them. Exams, Different implementations of a standard are not guaranteed to work, due for example to differences in default timer settings.


This command is executed from global configuration mode and manually sets the bridge priority per vlan on a switch. Simple and easy to understand explanation, good work, 9tut. The port attaching that bridge to the network segment is the designated port for the segment. This provides for both link redundancy and switch redundancy in the network. The alternative port moves to the forwarding state if there is a failure on the designated port for the segment.

This lab will deal with the new SW1 as a root bridge will always have the best ports so all of interfaces will be designated. This flag is propagated to all other switches to instruct them to rapidly age out their forwarding table entries. The time spent in the listening and learning states is determined by a value known as the forward delay default 15 seconds and set by the root bridge. To overcome this problem, inthe IEEE with document SW2 will also perform a sync operation with both SW3 and SW4 so they can quickly move to the forwarding state.

These formulas lead to the sample values in the table on the right: The interfaces that are left will be blocked:.