These answers were created by hand so please comment if anything appears to be wrong. The spanning tree protocol stp is a network protocol that builds a loopfree logical topology for ethernet networks. Spanning tree was originally developed by the digital equipment corporation dec, and the idea was adopted and modified by the ieee to become 802. Join cisco press author eric rivard in his spanning tree protocol explained training videos for ccna students. Spanning tree protocol is standardized as ieee 802. Stp is a layer 2 link management protocol that provides path redundancy while preventing loops in the. Change the hello timer on all switches for vlan 10 to 4 seconds. The basic function of stp is to prevent bridge loops and the broadcast radiation that results from them. While most people like the effects of redundancy, the redundancy can cause problems at layer 2. Rootthe port given this role is the selected best path to reach the root switch.
Spanningtree protocol stp is a layer 2 protocol that utilizes a specialpurpose algorithm to discover physical loops in a network and effect a logical loopfree topology. We will focus on spanning tree protocol stp configuration and verification commands in this tutorial, as implemented on cisco. As layer 2 networks grew, it quickly became evident that a system to prevent loops was needed if lans were to continue to function. Spanning tree protocol stp was developed before switches were created in order to deal with an issue that occurred with networks that were implementing network bridges. When you connect two or more layer 2 devices, an election is run to designate the root bridge. Cisco ccna spanning tree protocol tutorial jared heinrichs.
This series of tutorial videos on the spanning tree protocol stp dymsytifies and. Sep 25, 2014 join cisco press author eric rivard in his spanning tree protocol explained training videos for ccna students. This ccna tutorial site may be helpful for you to get the ccna certificate. Spanning tree protocol features security features on. If you dont know what the layer 2 switching loop is and how it works, i suggest you take a pause here and check the first of this tutorial first. Icnd2 chapter 1 switching and spanning tree protocol 11 understanding switching and switches 12 initial configuration of a catalyst switch spanning tree protocol stp 14 ciscos additions to stp portfast, bpduguard, bpdufilter, uplinkfast, backbonefast 15 rapid spanning tree protocol rstp 802. Sean wilkins, coauthor of ccna routing and switching 200120 network. Configuring multiple spanning tree protocol mstp free. Dads pop, poppa, wearing khakis, quiet, tearing down the old house one board at a time, tagging along at the cow sales barn, walking the property, and napping during the sunday morning sermon.
This content is only accessible by registered users. Pervlan spanning tree protocol is the default stp mode on cisco catalyst. First, it prevents problems caused by loops on a network. 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. So to assist you, below we will discuss one of the more difficult ccna concepts. Start studying ccna 200120 chapter 1 spanning tree protocol. Spanning tree protocol stp walkthrough pearson it certification. Cisco ccna ccent exam 640802, 640822, 640816 preparation kit.
Therefore, lans use spanning tree protocol stp, which allows the redundant lan links to be used while preventing frames from looping around the lan indefinitely through those redundant links. Introduction to stp, spanning tree protocol, broadcast storm, topological loop, switch macaddress table corruption,stp pdf file download, pdf file download, ethernet bridge, ethernet switch,layer 2 topological loop,ieee 802. To keep up with the speed of these routing protocols another flavor of spanningtree was createdrapid spanningtree. Spanning tree protocol networking fundamentals and. Stp is a protocol that runs on bridges and switches to find and block redundant looped paths during normal operation. Spanning tree protocol concepts and configuration spanning. One of the topics on the ccna rs version 3 exam is spanning tree protocol stp. If you are using gns3 than load the free ccna workbook gns3 topology than start devices. Spanningtree protocol stp premium ccna exam questions. To help you prepare for the icnd2 200101 certification exam, this chapter investigates how spanning tree protocol stp logically blocks. Stp creates a loopfree tree structure consisting of leaves and branches that span the entire layer 2 network. Jun 21, 2011 you are not allowed to use the spanning tree root command. Spanning tree protocol stp spanning tree protocol stp was developed to prevent the broadcast storms caused by switching loops.
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. Spanningtree protocol is a link management protocol that provides path redundancy while preventing undesirable loops in the network. Path of packet i count this as a technology topic because it involves the forwarding mechanisms for the various catalyst platforms, spanning tree protocol, multicast, and quality of service. Books ebooks exam vouchers practice tests product support. Spanning tree protocol concepts and configuration cisco press. Stp will identify if there are any loops, and then disable or block. Varieties of spanning tree protocols ccna routing and. Fundamentals of stp spanning tree protocol part i the logic. Spanning tree shuts down interfaces that are in a port fast operational state. Spanning tree protocol stp was developed before switches were created in order to deal with an.
Ccna tutorials a perfect guide to getting ccna certified. At the interface level, bpdu guard can be enabled on an interface by using the spanningtree bpduguard enable interface configuration command without also enabling the port fast feature. Introduction to spanningtree spanningtree is a protocol that runs on our switches that helps us to solve loops. If you have not yet registered, you will be prompted to register, before proceeding to access this content. Welcome to website, a free ccna tutorial site that closely follows the cisco ccna curriculum. This tutorial explains what the stp protocol is and how it removes loops from the network. Once the root switch is elected, each of the ports is given a role depending on its place within the stp topology. In later lessons we will go through topics such as routing protocols, ipv6, nat, spanning tree protocol note that this is not an official application.
Cisco 3200 series wireless mic software configuration guide. Make sure switch grasshopper is the root bridge for vlan 40, switch butterfly should be the backup in case switch butterfly fails. The site was designed to help you pass the ccna exam 200125, but it can also be used as a reference site for anything networking related. Routing protocols like ospf and eigrp are much faster than spanningtree when they have to deal with changes in the network. The mechanism is called the spanning tree protocol stp.
For an ethernet network to function properly, only one active. Rapid spanning tree protocol rstp one big disadvantage of stp is the low convergence which is very important in switched network. Switches running stp will build a map or topology of the entire switching network. Rstp excellent summary of rapid spanning tree protocol. Spanning tree also allows a network design to include backup links providing fault tolerance if an active link fails. To finds a redundant link, it uses an algorithm, known as the sta spanningtree algorithm. Before reading this article you should understand how stp works. Stp spanning tree protocol automatically removes layer 2 switching loops by shutting down the redundant links. Ccna training spanning tree protocol stp tutorial free download as pdf file. Jul 31, 2012 the internet seems to lack a lot of spanning tree protocol topologies for practice. These looping frames would cause network performance problems. There are many pdf books also available some of them are paid. Cisco introduced several enhancements to the standard stp operation that were later incorporated in rapid spanning tree protocol rstp defined as ieee 802.
Ospf 53 lab ospf chapter 6 switching and spanning tree protocol. These answers were created by hand so please comment. This factor of time is not an issue for many people, but it can cause problems for some. Spanning tree protocol introduction 11012015 jonathan leave a comment this is the first in a series of posts on spanning tree, in this post i will be describing the need for spanning tree protocol stp in modern lan environments. Portfast is a cisco network function which can be configured to resolve this problem. If you are not sure about stp, please read my spanning tree protocol tutorial first. The topology for the three connected switches in our example is a very simple. Posted by rene molenaar june 21, 2011 in switching. Hi guys, this post got awarded best publication at the cisco support community. Computernetworkingnotes ccna study guide stp spanning tree protocol. Ccna 200120 chapter 1 spanning tree protocol flashcards. Rapid spanning tree protocol rstp is the second stp type.
Spanning tree protocol, or stp, prevents switching loops in the layer 2 portion of our network. For a layer 2 network to function properly, only one active path can exist between any two stations. Spanningtree protocol, or stp, prevents switching loops in the layer 2 portion of our network. Dec 11, 2019 spanning tree protocol stp is a layer 2 protocol that runs on bridges and switches.
Cisco ccna spanning tree protocol stp spanning tree protocols stps main task is to stop network loops from occurring on your layer2 network bridges or switches. The spanning tree protocol is a layer 2 protocol used to avoid loops in a switched network. Chapter 3 introduction to cisco routers, switches and ios. It is easy to find one or two but finding more than that has been hard.
This command is executed in global configuration mode and places you into mst multiple spanning tree configuration mode. Configuring pervlan spanning tree protocol free ccna workbook. Rapid spanningtree is not a revolution of the original spanningtree but an evolution. Stp spanning tree protocol explained with examples. The time spanning tree protocol stp takes to transition ports over to the forwarding state can cause problems. In preparation of your ccna exam, we want to make sure we cover the various concepts that we could see on your cisco ccna exam. Ccna routing and switching practice and study guide. The internet seems to lack a lot of spanning tree protocol topologies for practice. Ccna training spanning tree protocol stp tutorial network.
It is a fast converged version of spanning tree protocol as its name implies. Spanning tree protocol explained step by step youtube. Configure and troubleshoot cisco spanning tree stp. This document descibes spanning tree protocol stp in a wireless environment. Which switch will be chosen as root bridge and why. If properly configured, the ports then stabilize to the forwarding or blocking state until a change in the network is made. In discussing the spanning tree protocol here, i will try to be as practical about it as possible. January 5, 2018 may 4, 2018 timigate 0 comments cisco, spanningtree protocol. Stp is on by default, but it only really comes alive when we have two or more switches interconnected with each other. At the interface level, bpdu guard can be enabled on an interface by using the spanning tree bpduguard enable interface configuration command without also enabling the port fast feature. It vigilantly monitors the network to find all links, making sure that no loops occur by blocking any redundant ones. Understanding and configuring spanning tree protocol stp on. Lan switching configuration guide spanning tree protocol. So if you are not sure about stp, please read my article about spanning tree protocol tutorial first.
Cisco aci application centric infrastructure how to index. Hello, im studying for the ccna at the end of the month and i wanted to know if anyone had any good resources for practicing spanning tree, especially since its such a big part of the test. Cisco spanning tree protocol guide stp examples and. Configuring pervlan spanning tree protocol free ccna. Ccna tutorials are available on various websites and offline books. Digital equipment corporation created a protocol called spanning tree protocol stp to prevent broadcast storms and network loops at layer 2. When the stp is enabled, every bridge and switch in the network starts in the blocking state and transitions to the listening and learning states. Read here what is ccna fee last updated december 2018. Learningthe interface prepares to participate in frame forwarding. The main purpose of stp is to ensure that you do not create loops when you have redundant paths in your network. Learn stp features and functions in detail with examples. Second, when redundant loops are planned on a network, stp deals with remediation of network. The original stp was developed by radia perlman while working for dce back in 1990.
This command is executed in global configuration and configures the switch to use the ieee 802. Spanning tree protocol ccnax 200120 ccna practice tests. Learn vocabulary, terms, and more with flashcards, games, and other study tools. This free tutorial can be used to study for the ccna 200120 exam, and it can also be used by anyone who wants to learn about computer networks in general. Multi spanning tree protocol allows for resource conservation by now requring an instance for every single vlan in the layer 2 network. This webcast shows you the stp topics for which youre responsible on the ccna rs 200125 or icnd2 200105. Rstp bypass the blocking state and listenning state of stp, and provide forwarding state in 15 seconds. Cisco ccna spanning tree protocol tutorial in most networks larger than your typical smb switched networks, there will be path redundancy. Spanning tree protocol stp is a big topic on the ccna exam. Spanning tree protocol is a link management protocol that provides path redundancy while preventing undesirable loops in the network. This section describes how spanningtree features work. Spanning tree protocol topology exercises learn networking. This book can be used as a study guide for either track you choose to receive your ccna the single exam, 640802 or.
Stp is a layer 2 link management protocol that provides path redundancy while preventing loops in the network. Jan 31, 2016 hi guys, this post got awarded best publication at the cisco support community. Pervlan spanning tree protocol is the default stp mode on cisco catalyst series switches. Spanningtree protocol stp creates the fullyconnected and loopfree topology by finding loops and blocking interfaces. Before we talk about spanning tree protocol, lets organize the different variants of stp. A deep understanding of the spanning tree protocol stp is crucial to. This lab will discuss and demonstrate the configuration and verification of 802. The election decides which switch will become the root bridge, as. Spanning tree protocol stp is standardized as ieee 802. When the interface receives a bpdu, the switch assumes that a problem exists and. Learning stateports that are in the learning state do not forward traffic.
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