Stp configuration lab 1 open the packet tracer scenario. You are not allowed to use the spanningtree root command. Example of a bridged network with a loop, and the minimum spanning tree with the loop removed. Spanning treeenabled switches go through a root election process based on bridge p rotocol data unit. Layer 2 switching and spanning tree protocol stp kumar.
Spanning tree protocol this document descibes spanning tree protocol stp in a wireless environment. Complex protocol that is generally poorly understood. When too many computers try to send at the same time, overall network performance is affected and can bring. Spanning tree enabled protocol ieee root id priority 32773 address 00. The stp module transmits and receives bpdus bridge protocol data units which permit the module to learn the topology of the network and disable ports if necessary. Clear the configuration of a standalone switch to prepare it for a new lab. Root selection varies depending on the bid of each switch in your lab resulting in varying outputs. Spanning tree protocol typically runs on switches like the transition networks management aggregation converter smacf100. All of the devices used in this document started with a cleared default configuration. When working with a switch that has been previously configured, any new commands entered will be merged. Stp configuration lab1 open the packet tracer scenario. This section describes how spanningtree features work. Im now able to create spanningtree protocol stp and vlan trunking protocol vtp lab using the famous switch triangle topology.
The purpose of this lab is to introduce the spanning tree protocol and how to configure priorities of core, distribution and access switches appropriately. Spanning tree protocol overview the plugandplay spanning tree protocol stp, a layer 2 protocol that ensures a loopfree topology in bridged lans, has been around for decades. Chapter 3 lab 31, spanning tree protocol stp default behavior. Mst configuration is manual as there no current method to propagate this info as in vtp. It was first introduced as cst common spanning protocol then ieee introduced its advanced version as stp with specification ieee 802. For a layer 2 network to function properly, only one active path can exist between any two stations. Mst is commonly used in extremely large networks where running pvst would tax switch resources. Root selection varies depending on the bid of each switch in your lab. This lab will take youre understanding of spanning tree just a bit further. This lab is complete when all wired trunks are carrying traffic, and all three switches are participating in. This lab has been developed as a packet tracer activity but can be completed with gns3 or real hardware. But there is a protocol called spanningtree protocol stp that is used to stop switching loops in a layer2 switched network. Pdf the stp spanning tree protocol which is standardized as ieee 802.
Understanding spanning tree protocol this section describes how spanningtree features work. Principles of imperative computation frank pfenning lecture 24 november 18, 2010 1 introduction. Chapter 6 switching and spanning tree protocol free ccna. This unsettling scenario just described is called a broadcast storm and can be avoided completely by using a layer 2 protocol sent among switches called the spanning tree protocol. On each switch, display the spanning tree table with the show spanningtree command. In addition, you will design an addressing scheme based on host requirements. Understanding and configuring spanning tree protocol stp. The predecessor lan of b2 is a, so the link joining b2 to ashould stay. If e is not in the spanning tree, then, indeed, we dont need it. The spanning tree protocol run my experiment on geni. Stp spanning tree protocol automatically removes layer 2 switching loops by shutting down the redundant links. Spanning tree protocol stp determines the least cost path from the root bridge to other nodes in the networks.
This protocol is used between switches, that will sometimes be called bridges in this lab. You use an algorithm called the spanning tree protocol just one of the. What is spanning tree protocol with stp lab youtube. Stp, rstp, and mstp page 3 overview of spanning trees overview of spanning trees the concept of the spanning tree protocol was devised to address broadcast storming. Lecture notes on spanning trees carnegie mellon school. Learn why do we need stp, spanning tree protocol and what it does to save your network from the loop and broadcast storm with lab example. This lab will explain the functions of the ieee standard multiple spanning tree protocol also referred to as mst. Cisco ccnp switch advanced spanning tree certificationkits. Configuring pervlan spanning tree protocol free ccna.
Troubleshooting spanning tree protocol topology diagram addressing table device. Stp is a layer 2 link management protocol that provides path redundancy while preventing loops in the network. Chapter 6 switching and spanning tree protocol freeccna 20150921t14. Multiple spanning tree multiple spanning tree protocol mstp network organized in regions regions have their own multiple spanning tree instances spanningtree topologies vlans are associated to mstis one common spanning tree cst for the entire network mstp based on rstp rapid stp. Pervlan spanning tree protocol pvst is maintaining a spanningtree instance for each vlan configured in the network and uses ciscos proprietary isl trunking protocol. The multiple spanning tree protocol mstp is an stp variant that allows multiple and independent spanning trees to be created over the same physical network.
The multiple spanning tree protocol mstp and algorithm, provides both simple and full connectivity assigned to any given virtual lan vlan throughout a bridged local area network. This document descibes spanning tree protocol stp in a wireless environment. We have some costly hardware test tools, but if you company is implementing spanning tree protocol, the chances are you will have any of these tools in ypur lab. Just like every coin has two sides, a redundant link, along with several advantages, has some disadvantages. To create a loopfree tree, bridges in the network exchange bpdus, and execute the spanning tree protocol as follows.
Spanning tree is basically used to find a minimum path to connect all nodes in a graph. Mstp uses bpdus to exchange information between spanningtree compatible devices, to prevent loops in each msti multiple spanning tree instances and in the cist common and. As the name suggests, it creates a spanning tree within a mesh network of connected layer2 bridges typically ethernet switches, and disables those links that are not part of the spanning tree, leaving a single active path between any two network nodes. Spanning treeenabled switches go through a root election process based on bridge p rotocol. In this lab scenario, you will configure a redundant network with vtp, multiple vlans, and stp. Ciscos per vlan spanning tree pvst provides a significant step up from. Spanning tree protocol stp is a layer 2 protocol that runs on switches. One big disadvantage of stp is the low convergence which is very important in switched network. The possible states that a spanning tree port can be. Pvst can load balance traffic at layer 2 of the osi model without causing a loop. Stp spanning tree protocol explained with examples.
This topology makes more meaningful and challenging stp and vtp lab as compared to a single or switch pair topology. Ccnp switch chapter 4 lab 42 multiple spanning tree. Spanning tree protocol stp spanning tree protocol stp was developed to prevent the broadcast storms caused by switching loops. A redundant link is usually created for backup purposes. As jonathon mentioned, there are so many devices that combine. In the first chapter, you were introduced to bit of switching and switches. This will be discussed in lab 415 configuring multiple spanning tree protocol. Configuring multiple spanning tree protocol mstp free. Cisco ccnp switch rapid spanning tree protocolrstp. Configure and troubleshoot cisco spanning tree stp learn how to configure stp, portfast and bpduguard on cisco switches free ccna course handson lab networking fundamentals switching troubleshooting written by alessandro maggio. Ranetcoresw to be the root bridge port fa02 of ranetsw2 to be in the blocking state please config spanningtree parameter on both ranetcoresw and ranetsw2 via its console to be as the requirement above. Introduction to spanningtree spanningtree is a protocol that runs on our switches that helps us to solve loops. To overcome this problem, in 2001, the ieee with document 802. The spanning tree protocol stp is a network protocol that builds a loopfree logical topology for ethernet networks.
The information in this document was created from the devices in a specific lab environment. Spanning tree protocol in layer 2layer 3 environments. Observe and explain the default behavior of spanning tree protocol stp, 802. Rapid spanning tree protocol rstp, which significantly reduces the convergence time after a topology change occurs in the network. In this lab, you will discover the spanning tree protocol, which is specified in the ieee 802. Switches running stp will build a map or topology of the entire switching network.
Configure and troubleshoot cisco spanning tree stp. Root selection varies depending on the default bid of each switch. Once a proprietary protocol from dec, spanning tree protocol stp was standardized and blessed by the ieee specification, 802. Spanning tree also allows a network design to include backup links to provide fault tolerance if an active link fails as the name suggests, stp creates a. He also developed several training and lab sessions for.
You already know that the layer 2 of the osi model deals with switching frames in the local network and that switches work at this layer. Spanning tree protocol stp is a layer 2 protocol that runs on bridges and switches. Consider, city network as a huge graph and now plans to deploy telephone lines in such a. Spanning tree protocol stp you are the network administrator of ranet, and would like. You can build the bpdu packet using the tool and test. Before proceeding, save as stp configuration lab 1working. Spanning tree protocol stp is a layer 2 network protocol used to prevent looping within a network topology. Make sure switch grasshopper is the root bridge for vlan 40, switch butterfly should be the backup in case switch butterfly fails. Change the hello timer on all switches for vlan 10 to 4 seconds. It treats a port as joining the active topology when it becomes. The purpose of this lab is to introduce the spanning tree protocol and how to configure priorities of core, distribution and access switches. Before proceeding, save as stp configuration lab1working. This lab is a continuation from the earlier set up exercise, and the lab layout is identical. Lab 6 spanning tree protocol res 841 october 20 introduction in this lab, you will discover the spanning tree protocol, which is speci.
Stp will identify if there are any loops, and then disable or block. Spanningtree protocol is a link management protocol that provides path redundancy while preventing undesirable loops in the network. The basic function of stp is to prevent bridge loops and the broadcast radiation that results from them. A redundant link is an additional link between two switches. The spanning tree protocol stp is designed to prevent layer 2 loops. Read how do all the operations happen and what are the chief components of the same. Cisco saw the need for spanning tree on all vlans and create the proprietary pvst and. Stp spanning tree protocol step by step configuration. Stp overview stp is a layer 2 link management protocol that prov ides path redundancy while preventing loops in the network. Spanning tree enabled protocol ieee root id priority. For an ethernet network to function properly, only one active. Spanning tree protocol stp stp often accounts for more than 50 % of the configuration, troubleshooting, and maintenance headaches in real world campus networks especially if they are poorly designed. In this exercise, we will explain how does the spanningtree protocol work.