Vrrp is configured on the hp 8200zl switches in the core. The spanning tree protocol stp is a network protocol that builds a loopfree logical topology for ethernet networks. Supermicro l2l3 switches configuration guide 5 spanning tree enabled switches exchange spanning tree protocol messages bpdu to form a loopfree topology. Vlan0003 spanning tree enabled protocol rstp root id priority 32771. When two ports on a switch are part of a loop, the spanningtree port priority and. For an ethernet network to function properly, only one active path can exist between two devices. This chapter describes how to configure the spanning tree protocol stp on portbased vlans. Configure stp spanning tree protocol in switches youtube.
Catalyst 2960x switch layer 2 configuration guide, cisco ios release 15. Configuring spanning tree protocol stp ftp directory listing hp. Aug 29, 2017 spanning tree follows a strict set of rules which when learnt, will allow you to answer any stp questions you get. We will focus on spanning tree protocol stp configuration and verification commands in this tutorial, as implemented on cisco switches. Software configuration guide, cisco ios release 15. Cisco introduced several enhancements to the standard stp operation that were later incorporated in rapid spanning tree protocol rstp defined as ieee 802. Just like every coin has two sides, a redundant link, along with several advantages, has some disadvantages. The table below shows the default spanning tree protocol stp configuration values. Rootthe port given this role is the selected best path to reach the root switch. To enable spanning tree, connect to your switch and type spanningtree mode while in global configuration mode. Each spanning tree instance is independent of other instances. Through the meraki dashboard, you can configure networkwide stp settings including enabling rstp and setting the bridge priority on ms switches. Spanning tree protocol stp spanning tree protocol stp was developed to prevent the broadcast storms caused by switching loops.
Cisco has created this backup port for the function of supporting connectivity between switches that have some form of an unsupported spanningtree device between them. Dec 11, 2019 spanning tree protocol stp is a layer 2 protocol that runs on bridges and switches. Spanning tree protocol concepts and configuration cisco press. In multiple spanning tree protocol mstp, each spanning tree instance can contain several vlans. In order to do so, all switches in the network exchange bpdu messages between them to agree upon the root bridge. Second, when redundant loops are planned on a network, stp deals with remediation of network. At this time there were no switches yet, only bridges, but because bridges and switches technically. Lan switching configuration guide spanning tree protocol. Note, that the backup port is hardly ever seen in reallife production networks because its only used where a switch has multiple links to the same layer 1. The problem is that when we create redundancyat a layer 2 level of our networks,we create loops that traffic will traverse indefinitely.
Apr, 2020 information about spanning tree protocol. The spanning tree protocol stp is responsible for identifying links in the network and shutting down the redundant ones, preventing possible network loops. Spanning tree protocol explained step by step youtube. Understanding and configuring spanning tree protocol stp. The original stp was developed by radia perlman while working for dce back in 1990. You can configure spanning tree protocol stp and rapid spanning tree protocol rstp on meraki ms switches.
Configure the s1, s2, and s3 switches according to the following guidelines. Follow the steps as we proceed from a blank scenario to one in which all continue reading spanning tree the roots go deeper. Dear support, im implementing hsrp on core switch in my network, but spanning tree always block one port on the layer 2 switch. Spanning tree protocol spanning tree overview 1455 the following sections describe spanning tree configuration parameters. The following table lists some of the differences among the. 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. Infrastructure devices such as wireless access pointbridges and switches send and receive spanningtree frames, called bridge protocol data units bpdus. Presentation et configuration du protocole spanning tree stp. 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. Log in to the web configuration utility and choose spanning tree stp. Port mirroring igmp snooping for multicast filtering mac forwarding entries. Consolidated platform configuration guide, cisco ios. First, it prevents problems caused by loops on a network. Sonos, cisco, stp, mst, and spanning trees sonos community.
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 stp timers. What is spanningtree protocol stp and how does it work with. This topic applies only to the jweb application package. All the switches exchange information for use in the root switch selection and for subsequent configuration of the network. The basic function of stp is to prevent bridge loops and the broadcast radiation that results from them. If you configure a portbased vlan on the device, the vlan has the same stp state as the default stp state on the device. Root selection varies depending on the bid of each switch in your lab resulting in varying outputs. Configuring spanning tree on meraki switches ms cisco meraki. Spanning tree protocol stp is a big topic on the ccna exam. Nov 29, 2018 to do that, refer to article configure spanning tree protocol stp status and global settings on esw2350g switches for more information. Spanning tree protocol stp is a link management protocol that provides path redundancy while preventing undesirable loops in the network. I have two cascaded switches, and ive configured stp actually, mst, since that seems to work with the sonos devices. Aug 04, 2011 mstp is similar to cisco systems multiple instances spanning tree protocol mistp, and is an evolution of the spanning tree protocol and the rapid spanning tree protocol.
Understanding and configuring spanning tree protocol stp cisco. Many people struggle with stp so in this video, we try to break it down as much as possible. On each switch, display the spanning tree table with the show spanningtree command. Before we talk about spanning tree protocol, lets organize the different variants of stp. The bridges send configuration bpdus through the ethernet and radio ports. Understanding and configuring spanning tree protocol stp on. If you havent seen it before, i would recommend to look at it first before diving in the configuration. Nov, 2015 i did not disable the spanning tree, i just add in the vpc the spanning tree port type and in global configuration i set the spanning priority to the vlans. Filtering filters bpdu packets when spanning tree is disabled on an interface.
Stp spanning tree protocol explained with examples. A redundant link is an additional link between two switches. This approach provides multiple forwarding paths for data traffic, enabling load balancing, and reducing the number of spanning tree instances required to support a large number of vlans. Spanning tree protocol stp is a layer 2 protocol that runs on bridges and switches. Spanning tree protocol stp is a layer 2 link management protocol that provides path redundancy while preventing loops in the network. Switches running stp will build a map or topology of the entire switching network. When i only have players wired to the core switch, things work as expected. Stp is a layer 2 link management protocol that provides path redundancy. Stp spanning tree protocol step by step ciscoforall. Stp spanning tree protocol automatically removes layer 2 switching loops by shutting down the redundant links. 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. While i have posted a couple of blogs regarding spanningtree, the layer 2 loop prevention mechanism that runs on cisco switches, i wanted to post one with a few more switches and a bit more detail on the stepbystep process.
Consolidated platform configuration guide, cisco ios release 15. A redundant link is usually created for backup purposes. By default, on cisco switching equipment, each vlan has its own stp instance and a root switch is elected for each vlan. Bpdu is used to transmit spanning tree information when stp is disabled on the port or the switch. A catalyst 4500 series switch use stp the ieee 802. Once the root switch is elected, each of the ports is given a role depending on its place within the stp topology. Configure and troubleshoot cisco spanning tree stp. Cisco spanning tree protocol guide stp examples and. The main purpose of stp is to ensure that you do not create loops when you have redundant paths in your network. Each layer 2 interface on a switch using spanning tree protocol stp exists in one of the following states. To define bridge protocol data unit bpdu handling when the spanning tree is. This is because layer 2 ethernet frameshave no time to live or time out mechanismbuilt into the frame.
Configuring spanning tree protocol this chapter describes how to configure the spanning tree protocol stp on portbased vlans on the catalyst switches. Jul 11, 2015 configure stp spanning tree protocol in switches. 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. Hi all, im wrestling with an stp issue on some cisco switches and im hoping for some advice. By default, a single spanning tree runs on each configured vlan.
Stp will identify if there are any loops, and then disable or block. This chapter describes how to configure the spanning tree protocol stp on. Rapid spanningtree configuration in a previous lesson i explained the differences between classic and rapid spanningtree and how rapid spanningtree works. Layer 2 configuration guide, cisco ios xe gibraltar 16. A number of cisco ios command parameters are associated with the show spanning tree command. Spanning tree protocol stp interface settings configuration. As shown in example 310, the show spanning tree active command displays spanning tree configuration details for the active interfaces only. How to configure spanning tree protocol on cisco switch in. Spanning tree interoperability between hp and cisco switches. How to configure spanning tree on cisco switches youtube. May 14, 2016 tutorial on stp, spanning tree protocol algorithm, which finds the minimum spanning tree for packet forwarding between switches in a network. Click the desired radio button in the bridge protocol data unit bpdu handling field. How to configure spanning tree protocol on cisco switch in gns3 sysnettech solutions article read more s u b s c r i b e h.
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