Understanding and configuring spanning tree protocol stp. Introduction to spanning tree spanning tree is a protocol that runs on our switches that helps us to solve loops. Stp spanning tree protocol step by step ciscoforall. Vrrp is configured on the hp 8200zl switches in the core.
The main purpose of stp is to ensure that you do not create loops when you have redundant paths in your network. Second, when redundant loops are planned on a network, stp deals with remediation of network. Dec 09, 2017 spanning tree protocol stp determines the least cost path from the root bridge to other nodes in the networks. For an ethernet network to function properly, only one active path can exist between two devices. Spanning tree protocol stp spanning tree protocol stp was developed to prevent the broadcast storms caused by switching loops. I discuss how stp mitigates layer 2 loops and layer 2 broadcast storms. Stp and mst catalyst 65006000 switches that run cisco ios software configuring stp and mst catalyst 4500.
Cisco ccna rapid spanning tree protocol rstp configuration. On each switch, display the spanning tree table with the show spanningtree command. Spanning tree protocol stp is a link management protocol that provides path redundancy while preventing undesirable loops in the network. Configuring stp and mst catalyst 45004000 switches that run. 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.
Mst is a new ieee standard derived from ciscos proprietary multiinstance spanningtree protocol mistp implementation. Configuring spanning tree protocol stp ftp directory listing hp. Lan switching configuration guide, cisco ios xe release 3s. Spanning tree protocol concepts and configuration cisco press. The table below shows the default spanning tree protocol stp configuration values. You complete three major steps to configure stp on the wmic. The bridges send configuration bpdus through the ethernet and radio ports. Stp switches exchange bridge protocol data units bpdus to build the topology. 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. Spanning tree protocol, spanning tree algorithm, networking, trill, spb.
Cbt nuggets trainer jeremy cioara explains how to configure spanning tree protocol as well as the different types of spanning tree protocols. Consolidated platform configuration guide, cisco ios release. Refer to these documents for information on the configuration of stp on other switch platforms. Supermicro l2l3 switches configuration guide 5 spanning tree enabled switches exchange spanning tree protocol messages bpdu to form a loopfree topology. Bridges exchange bridge protocol data unit bpdu messages with other bridges to detect loops, and the bridges shut down selected ports to stop the loops. Configuration of rapid spanning tree protocol rstp. Why cant each switch have a 32270 the cisco learning network.
In addition, mstp transmits packets assigned to various vlans through different multiple spanning tree mst regions. Enter the hello time interval in seconds that a root bridge waits between configuration messages in the hello time field. This lab will discuss and demonstrate the configuration and verification of 802. Although the portfast is configured, stp is still active in the port or the interface.
Spanning tree protocol the spanning tree protocol stp is a network protocol that ensures a loopfree topology for any bridged ethernet local area network. Spanning tree protocol stp in packet tracer part 1. Im studying spanning tree protocol and im not clear as to why spanning tree was implemented as it was. Aug 28, 2011 in this video jagvinder thind shows rstp configuration in hindi or rapid spanning tree protocol 802. 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. Spanning tree protocolsome links below may open a new browser window to display the document you selected. Configure and troubleshoot cisco spanning tree stp. If you havent seen it before, i would recommend to look at it first before diving in the configuration. Understanding and configuring spanning tree protocol stp on catalyst switches. 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. Layer 2 and layer 3 configuration guide, cisco ios xe everest 16. Rootthe port given this role is the selected best path to reach the root switch.
Configure spanningtree on cisco router network engineering. Bridges use stp to eliminate loops in an extended network. Jul 20, 20 i will explain step by step to configure spanning tree protocol. Multi spanning tree protocol allows for resource conservation by now requring an instance for every single vlan in the layer 2 network. To enable spanning tree, connect to your switch and type spanningtree mode while in global configuration mode. It is desirable to have redundant links in a switched lan so that a single link failure cannot interrupt normal operation of the network. Download packet tracer find developer training with devnet. Thats where we can have a convergence time of 50 seconds and that where even, if we have multiple vlans, all of the vlans are using the same instances of spanning tree protocol, its called a cst or common spanning tree. Click apply to save the changes to the devices runningconfig file. If properly configured, the ports then stabilize to the forwarding or blocking state until a change in the network is made. Troubleshooting multicastingalso, download ccnp collaboration certification content updates from ccnp voice pdf.
Pvst uses 1 stp for each vlan, mst uses 1 stp for multiple vlans so we have a mismatch here. Nov 22, 2014 dear all, regarding best practice related to spanning tree and etherchannel, we have decided to configure following. First, it prevents problems caused by loops on a network. Click the desired radio button in the bridge protocol data unit bpdu handling field. With mst, you can map a single spanningtree instance to several vlans. Rapid spanning tree protocol rstp is a layer 2 network protocol used to obtain a loop free topology. I have studied much about stp but still there are many ques 90425.
Spanning tree protocol 90425 the cisco learning network. The objective of this document is to explain the steps to configure rstp on cisco small business wrvs4400n routers. If necessary, assign interfaces and subinterfaces to. For a layer 2 ethernet network to function properly, only one active path can exist between any two stations.
Spanning tree protocol stp protects layer 2 broadcast domains from broadcast storms. Read how do all the operations happen and what are the chief components of the same. Lan switching configuration guide spanning tree protocol. To download cisco ccnp routing pdf study guide click here.
Understanding and configuring spanning tree protocol stp cisco. Consolidated platform configuration guide, cisco ios release 15. Spanning tree enabled switches exchange spanning tree protocol messages bpdu to. It is quite useful and should be enabled on the switch interfaces. Download cisco ccnp routing pdf study guide snabay networking. Stp is a layer 2 link management protocol that provides path redundancy while preventing loops in the network. Stp spanning tree protocol step by step configuration.
Cisco small business 500 series stackable managed switches. Spanning tree protocol stp for ccna rs 200125 and icnd2 200105 candidates duration. The following table lists some of the differences among the. Bpdu is used to transmit spanning tree information when stp is disabled on the port or the switch. Configure spanning tree protocol stp on a switch cisco. The basic function of stp is to prevent bridge loops and the broadcast storms that result from these loops. Rapid spanning tree protocol improved stp with faster convergence backward compatible with stp rstp ieee 802. Spanning tree protocol stp is a layer 2 link management protocol that provides path redundancy while preventing loops in the network. Spanning tree protocol stp is a layer 2 protocol that runs on. These three ports will be configured for access mode and enabled with the no shutdown command. Can someone share videos and tutorials of advanced level stp with me personally please. Download pdf stp spanning tree protocol step by step configuration tutorial when sw3 start receiving inferior bpdus at its interface from sw2, switch3 would ignore the inferior information until the bpdus stored with the blocked port expires max age timer 20 seconds. Spanning tree interoperability between hp and cisco switches. Based on the exchanged bpdu information, the spanning tree algorithm selects one of the switches on the network as the root switch for the tree topology.
Aug 08, 2019 information about spanning tree protocol. Complex protocol that is generally poorly understood. Rapid spanning tree protocol incorporates several of ciscos stp enhancements and ensures a safe and quick transition to a forwarding state and topology convergence by removing the overdependence on. Rstp is an enhanced version of spanning tree protocol stp, which provides a faster convergence to obtain a loop free topology. May 14, 2016 tutorial on stp, spanning tree protocol algorithm, which finds the minimum spanning tree for packet forwarding between switches in a network. Configuring spanning tree protocol stp on the bridge. Once the root switch is elected, each of the ports is given a role depending on its place within the stp topology. Dec 11, 2019 spanning tree protocol stp is a layer 2 protocol that runs on bridges and switches. 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. This document descibes spanning tree protocol stp in a wireless environment.
Dell networking and cisco spanning tree interoperability. Hi michael, ist0 is called ist internal spanning tree and these are the vlans that havent been mapped to another instance. Cisco spanning tree protocol guide stp examples and. Spanning tree protocol stp configuration on sx500 series stackable switches. Switches running stp will build a map or topology of the entire switching network. Catalyst 2960x switch layer 2 configuration guide, cisco ios release 15. All switches from cisco ship with spanning tree protocol stp enabled by default, but if stp is misconfigured for any reason, you can easily enable it. Stp will identify if there are any loops, and then disable or block. Spanning tree protocol variants best cisco ccna ccnp and. 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. Configuring spanning tree protocol default spanning tree configuration. Root selection varies depending on the bid of each switch in your lab resulting in varying outputs.
On ports connecting to other switches enable root guard. Rapid spanningtree configuration in a previous lesson i explained the differences between classic and rapid spanningtree and how rapid spanningtree works. Feb 22, 2012 a beginners tutorial on the function and purpose of stp spanning tree protocol in a local area network. Configuring multiple spanning tree protocol mstp free. Catalyst 4500 series switch software configuration.
460 705 902 1019 361 1191 577 1376 971 129 1325 877 477 93 866 168 1103 1023 1490 1256 1289 55 1464 1187 37 1138 921 1251 120 877 731 954 682 263 253 49 268 372