Root selection varies depending on the bid of each switch in your lab. Spanning tree protocol stp ensures a loopfree topology in a local area network lan made up of switches. Configuring pervlan spanning tree protocol free ccna workbook. 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. Stp is on by default, but it only really comes alive when we have two or more switches interconnected with each other. Understanding and configuring spanning tree protocol stp cisco. Nov 16, 2016 one of the topics on the ccna rs version 3 exam is spanning tree protocol stp. Digital equipment corporation created a protocol called spanning tree protocol stp to prevent broadcast storms and network loops at layer 2.
This lab will discuss and demonstrate the configuration and. It vigilantly monitors the network to find all links, making sure that no loops occur by blocking any redundant ones. Spanning tree protocol stp spanning tree protocol stp was developed to prevent the broadcast storms caused by switching loops. This section describes how spanning tree features work. Read how do all the operations happen and what are the chief components of the same. For this configuration, we need to designate one of the routers to be the frame relay switch. The golden rule of spanning tree protocol is lower is better. 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. Sep 23, 2016 ccnav3 chapter 2 notes spanning tree protocol. Spanning tree protocol premium ccna exam questions. Understanding spanning tree protocol this section describes how spanning tree features work. The main purpose of stp is to ensure that you do not create loops when you have redundant paths in your network. Jan 31, 2016 hi guys, this post got awarded best publication at the cisco support community. In this article, we will learn how stp prevents loops, and how it handles the layer 2 convergence.
It is desirable to have redundant links in a switched lan so that a single link failure cannot interrupt normal operation of the network. Cisco ccna spanning tree protocol tutorial jared heinrichs. Introducing spanningtree protocol linkedin learning. Spanning tree protocol ccnax 200120 ccna practice tests. For a layer 2 network to function properly, only one active path can exist between any two stations. It is quite useful and should be enabled on the switch interfaces. So therefore, if there is a tie in our value with spanning tree protocol, there has to be a tiebreaker mechanism. Before we talk about spanning tree protocol, lets organize the different variants of stp.
Before the introduction of vlans, the stp spanning tree protocol was in. Just like every coin has two sides, a redundant link, along with several advantages, has some disadvantages. Jun 21, 2011 you are not allowed to use the spanning tree root command. Spanning tree protocol juan zambrano burgos instructor ccna juan. What is the purpose of spanning tree protocol in a ccna. Switches that are configured with vlans make forwarding decisions based on both layer 2 and layer 3 address information. So to assist you, below we will discuss one of the more difficult ccna concepts. Stp spanning tree protocol automatically removes layer 2 switching loops by shutting down the redundant links. Make sure switch grasshopper is the root bridge for vlan 40, switch butterfly should be the backup in case switch butterfly fails.
Optional saves your entries in the configuration file. Spanning tree protocol stp for ccna rs 200125 and icnd2. These answers were created by hand so please comment if anything appears to be wrong. Learn spanning tree protocol mcq questions and answers with easy and logical explanations for various competitive examination, interview and entrance test.
Establishing vlans increases the number of broadcast domains. Configure and troubleshoot cisco spanning tree stp. Pdf frame relay protocol please refer to the above diagram, which shows a configuration based on the frame relay protocol. Believe it or not, you could make an enterprise collapse by plugging a cable in the wrong place. Refer to these documents for information on the configuration of stp on other switch platforms. 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. As layer 2 networks grew, it quickly became evident that a system to prevent loops was needed if lans were to continue to function.
Understanding and configuring spanning tree protocol stp. Spanning tree protocol protocol to calculate a spanning tree convergence all bridges should reach a unified view of the spanning tree special frames sent between neighbour switches bridge protocol data units, bpdus not forwarded. Root selection varies depending on the bid of each switch in your lab resulting in varying outputs. Spanningtree protocol stp premium ccna exam questions.
Configuring pervlan spanning tree protocol free ccna. For more information and to download the packet tracer files used in the video go to. Spanning tree protocol topology exercises learn networking. Mar 16, 2018 spanning tree protocol stp cisco ccna 200301 duration. The spanning tree protocol is a link management protocol that is designed to support redundant links while at the same time preventing switching loops in the network. Stp overview stp is a layer 2 link management protocol that prov ides path redundancy while preventing loops in the network. Introduction to spanning tree protocol by george thomas, contemporary controls introduction in an industrial automation application that relies heavily on the health of the ethernet network that attaches all the controllers and computers together, a concern exists about what would happen if the network fails. This webcast shows you the stp topics for which youre responsible on the ccna rs 200125 or icnd2 200105. Spanning tree protocol, rapid stp port costs and port states are an essential part of the stp algorithm that affect how stp decides to forward or block a port leading to the root bridge. The output shown in this lab is based on cisco 2960 switches.
One of the topics on the ccna rs version 3 exam is spanning tree protocol stp. These looping frames would cause network performance problems. Spanning tree protocol stp in packet tracer part 1 youtube. Complex protocol that is generally poorly understood. Stp creates a loopfree tree structure consisting of leaves and branches that span the entire layer 2 network. Pervlan spanning tree protocol is the default stp mode on cisco catalyst series switches. 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.
Sep 11, 2015 join lazaro diaz for an indepth discussion in this video, introducing spanning tree protocol, part of ccna cert prep. Spanning tree protocol explained step by step youtube. Spanning tree protocol networking mcq questions and answers. Spanning tree protocol stp in packet tracer part 1. 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. Microsegmentation decreases the number of collisions on the network. Spanning tree protocol stp is a layer 2 protocol that runs on bridges and switches. Spanning tree protocol this document descibes spanning tree protocol stp in a wireless environment. Stp is a layer 2 link management protocol that provides path redundancy while preventing loops in the network. Observe and explain the default behavior of spanning tree protocol stp, 802. Change the hello timer on all switches for vlan 10 to 4 seconds.
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. Switches running stp will build a map or topology of the entire switching network. This webcast shows you the stp topics for which youre responsible on the ccna. Many people struggle with stp so in this video, we try to break it down as much as possible. The spanning tree protocol stp is a network protocol that builds a loopfree logical topology.
Alternative multiple spanning tree protocol amstp for optical ethernet backbones pdf. Spanning tree protocol, rapid stp port costs port states. Stp is a layer 2 link management protocol that provides path redundancy while. Below is the chapter 1 quiz for ccna 3, handcrafted by. The multiple spanning tree protocol mstp and algorithm, provides both simple and full. Cisco also published a proprietary version of rapid spanning tree protocol. Configuring rapid pervlan spanning tree protocol free ccna. May 28, 2008 this document descibes spanning tree protocol stp in a wireless environment. Understanding issues related to intervlan bridging pdf. Spanning tree protocol allows switches to automatically share vlan information. 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. Cisco ccna icnd2 exam practice questions on spanning tree alogorithm stp. A configure a seperate subinterface for each pvc with a unique dlci and subnet assigned to the subinterface explanation if you have a serial port configured with multiple dlcis connected to multiple remote sites, split horizon rules stop route updates received on an interface from being sent out the same interface.
Dec 22, 2012 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. Spanning tree protocol stp is standardized as ieee 802. A redundant link is an additional link between two switches. Spanning tree protocol stp is a network protocol designed to prevent layer 2 loops. Cisco spanning tree protocol guide stp examples and. A redundant link is usually created for backup purposes. Stp article in the wireshark wiki includes a sample pcapfile of captured stp. Lab setup instructions\cisco basic ccna lab setup instructions. In fact, a wrong connection may cause a loop with frames duplicating across the network. While most people like the effects of redundancy, the redundancy can cause problems at layer 2. It has some similarities with cisco systems multiple instances spanning tree protocol mistp, but there are some differences.
Stp will identify if there are any loops, and then disable or block. Spanning tree protocol, or stp, prevents switching loops in the layer 2 portion of our network. Difference between file transfer protocol ftp and secure file transfer protocol sftp cisco discovery protocol cdp and link layer discovery protocol. On each switch, display the spanning tree table with the show spanning tree command.
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