Spanning tree protocol stp spanning tree protocol stp was developed to prevent the broadcast storms caused by switching loops. For this configuration, we need to designate one of the routers to be the frame relay switch. Complex protocol that is generally poorly understood. Difference between file transfer protocol ftp and secure file transfer protocol sftp cisco discovery protocol cdp and link layer discovery protocol. Establishing vlans increases the number of broadcast domains. The main purpose of stp is to ensure that you do not create loops when you have redundant paths in your network. Spanning tree protocol, or stp, prevents switching loops in the layer 2 portion of our network. Configure and troubleshoot cisco spanning tree stp. It is desirable to have redundant links in a switched lan so that a single link failure cannot interrupt normal operation of the network. Switches that are configured with vlans make forwarding decisions based on both layer 2 and layer 3 address information. Cisco ccna spanning tree protocol tutorial jared heinrichs. Stp is a layer 2 link management protocol that provides path redundancy while preventing loops in the network.
Read how do all the operations happen and what are the chief components of the same. It is quite useful and should be enabled on the switch interfaces. Spanning tree protocol stp in packet tracer part 1. Make sure switch grasshopper is the root bridge for vlan 40, switch butterfly should be the backup in case switch butterfly fails. Before the introduction of vlans, the stp spanning tree protocol was in. Pervlan spanning tree protocol is the default stp mode on cisco catalyst series switches.
Below is the chapter 1 quiz for ccna 3, handcrafted by. So therefore, if there is a tie in our value with spanning tree protocol, there has to be a tiebreaker mechanism. Mar 16, 2018 spanning tree protocol stp cisco ccna 200301 duration. Sep 23, 2016 ccnav3 chapter 2 notes spanning tree protocol. Spanning tree protocol premium ccna exam questions. Stp overview stp is a layer 2 link management protocol that prov ides path redundancy while preventing loops in the network. Switches running stp will build a map or topology of the entire switching network. Just like every coin has two sides, a redundant link, along with several advantages, has some disadvantages. Optional saves your entries in the configuration file.
Jun 21, 2011 you are not allowed to use the spanning tree root command. So to assist you, below we will discuss one of the more difficult ccna concepts. Many people struggle with stp so in this video, we try to break it down as much as possible. Cisco spanning tree protocol guide stp examples and. One of the topics on the ccna rs version 3 exam is spanning tree protocol stp. Configuring pervlan spanning tree protocol free ccna workbook. Introducing spanningtree protocol linkedin learning. 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. 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 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. Cisco ccna spanning tree protocol tutorial in most networks larger than your typical smb switched networks, there will be path redundancy. Pdf frame relay protocol please refer to the above diagram, which shows a configuration based on the frame relay protocol. Alternative multiple spanning tree protocol amstp for optical ethernet backbones pdf.
This webcast shows you the stp topics for which youre responsible on the ccna rs 200125 or icnd2 200105. Observe and explain the default behavior of spanning tree protocol stp, 802. Stp will identify if there are any loops, and then disable or block. Spanning tree protocol ccnax 200120 ccna practice tests. January 5, 2018 may 4, 2018 timigate 0 comments cisco, spanningtree protocol the spanning tree protocol is a layer 2 protocol used to avoid loops in a switched network. A redundant link is usually created for backup purposes. Spanning tree protocol stp is standardized as ieee 802. Spanning tree protocol explained step by step youtube. Stp is on by default, but it only really comes alive when we have two or more switches interconnected with each other. Cisco also published a proprietary version of rapid spanning tree protocol.
Dec 09, 2017 spanning tree protocol stp determines the least cost path from the root bridge to other nodes in the networks. Spanning tree protocol allows switches to automatically share vlan information. Spanning tree protocol, rapid stp port costs port states. Learn spanning tree protocol mcq questions and answers with easy and logical explanations for various competitive examination, interview and entrance test. It is easy to find one or two but finding more than that has been hard. 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. For more information and to download the packet tracer files used in the video go to. Spanning tree protocol juan zambrano burgos instructor ccna juan.
Root selection varies depending on the bid of each switch in your lab. The output shown in this lab is based on cisco 2960 switches. This section describes how spanning tree features work. What is the purpose of spanning tree protocol in a ccna. Spanning tree protocol stp is a big topic on the ccna exam.
While most people like the effects of redundancy, the redundancy can cause problems at layer 2. Sep 11, 2015 join lazaro diaz for an indepth discussion in this video, introducing spanning tree protocol, part of ccna cert prep. These looping frames would cause network performance problems. Spanning tree protocol stp is a network protocol designed to prevent layer 2 loops. 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. In this article, we will learn how stp prevents loops, and how it handles the layer 2 convergence. Believe it or not, you could make an enterprise collapse by plugging a cable in the wrong place.
Spanning tree protocol this document descibes spanning tree protocol stp in a wireless environment. Configuring pervlan spanning tree protocol free ccna. For a layer 2 network to function properly, only one active path can exist between any two stations. 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. Understanding and configuring spanning tree protocol stp cisco.
Stp spanning tree protocol automatically removes layer 2 switching loops by shutting down the redundant links. This lab will discuss and demonstrate the configuration and. Root selection varies depending on the bid of each switch in your lab resulting in varying outputs. 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.
Before we talk about spanning tree protocol, lets organize the different variants of stp. Spanning tree protocol stp for ccna rs 200125 and icnd2. On each switch, display the spanning tree table with the show spanning tree command. Spanning tree protocol stp in packet tracer part 1 youtube. Configuring rapid pervlan spanning tree protocol free ccna. 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.
May 28, 2008 this document descibes spanning tree protocol stp in a wireless environment. Spanningtree protocol stp premium ccna exam questions. 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. Understanding spanning tree protocol this section describes how spanning tree features work. 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 topology exercises learn networking. Stp creates a loopfree tree structure consisting of leaves and branches that span the entire layer 2 network. Refer to these documents for information on the configuration of stp on other switch platforms. The golden rule of spanning tree protocol is lower is better. A redundant link is an additional link between two switches. Nov 16, 2016 one of the topics on the ccna rs version 3 exam is spanning tree protocol stp. The spanning tree protocol stp is a network protocol that builds a loopfree logical topology. 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.
Lab setup instructions\cisco basic ccna lab setup instructions. 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. Jan 31, 2016 hi guys, this post got awarded best publication at the cisco support community. 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. 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. Jul 31, 2012 the internet seems to lack a lot of spanning tree protocol topologies for practice. Spanning tree protocol networking mcq questions and answers. Digital equipment corporation created a protocol called spanning tree protocol stp to prevent broadcast storms and network loops at layer 2. These answers were created by hand so please comment if anything appears to be wrong. Stp article in the wireshark wiki includes a sample pcapfile of captured stp.
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. 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. Stp is a layer 2 link management protocol that provides path redundancy while. Change the hello timer on all switches for vlan 10 to 4 seconds. In fact, a wrong connection may cause a loop with frames duplicating across the network. Understanding issues related to intervlan bridging pdf. This webcast shows you the stp topics for which youre responsible on the ccna. The multiple spanning tree protocol mstp and algorithm, provides both simple and full. Spanning tree protocol stp ensures a loopfree topology in a local area network lan made up of switches. Stp spanning tree protocol explained with examples. Cisco ccna icnd2 exam practice questions on spanning tree alogorithm stp. Lab spanningtree et rapid spanningtree cisco cisco.
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