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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The classic spanning tree had to walk through the listening and learning state before it would move an interface to the forwarding state, this took 30 seconds with the default timers.

This lab will deal with the new Some bridges implement both the IEEE and the DEC versions of tugorial Spanning Tree Protocol, but their interworking can create issues for the network administrator, as illustrated by the problem discussed in an on-line Cisco document. Rapid spanning-tree has a way of dealing with switches running the older spanning-tree version. The highest priority will mean the path will ultimately be less preferred. The number of states a port can be in has been reduced to three instead of STP’s original five.

RSTP bridge port roles: Not all bridge manufacturers follow that rule, some making all ports designated ports and putting them all into forwarding mode. This lab however cosco be completed on the Stub Lab.


In these cases, candidates for the root port have already received BPDUs offering equally-low i. Please help Designated ports are selected based on the lowest path cost to the root bridge for a segment. Tutoria, is the first difference between spanning-tree and rapid spanning-tree.

If either L1 or L2 links fail, this link L3 automatically gets activated. Spanning tree is an older protocol with a longer default hold-down time that governs convergence of the protocol state.

Understanding Spanning Tree Protocols – STP, RSTP, MSTP

The interfaces that are left will be blocked:. P P P P P So designated port are choose by lower Mac Adress or Path cost??? It sends and receives So please help me with this KOWO. Consider the above diagram. If the root bridge goes down, the protocol will automatically assign a new root bridge based on the bridge ID. The decision process involves the following parameters inside the BPDU: Cisco also published a proprietary version of Rapid Spanning Tree Protocol.

STP then disables redundant links by setting up one preferred and optimized link between switches in the LAN. Premium Membership Become a member to interact with all questions and practice labs!

You already know about learning and forwarding but discarding is a new port state. The other port will be Backup port according to the definition of Backup port above. The root bridge of the spanning tree is the bridge with the smallest lowest bridge ID. There are only three port states left in RSTP that correspond to the three possible operational states.


In the classic spanning-tree the flags field tutoria, had two bits in use:. Administrators can influence the protocol’s choice of the preferred path by configuring the port cost, the lower the port cost the more likely it is that the protocol will choose the connected link as root port for the preferred path. So, STP is used to identify the best path to the destination, and block all other paths links. BTW…Yes I am recommonding this site.

Basically it combines the blocking and listening port state. Take a estp at the picture below:. The BPDU clsco different for rapid spanning-tree. Rapid spanning tree will accept inferior BPDUs. It will instead go through a number of states while it processes BPDUs and determines the topology of the network.

CCNA Training » Rapid Spanning Tree Protocol RSTP Tutorial

Turorial lower bridge ID is 24, so the tie breaker dictates that the designated port is the port through which network segment d is connected to bridge Does this ring a bell? Every answer has good example and explained very well.

Spanning tree also allows a network design to include backup links to provide fault tolerance if an active link fails.

If bridge IDs were equal, then the bridge with the lowest MAC address would have the designated port.