In the below example, should spanning tree portfast and spanning tree bpduguard enable be cod. The main purpose of stp is to ensure that you do not create loops when you have redundant paths in your network. We will focus on spanning tree protocol stp configuration and verification commands in this tutorial, as implemented on cisco switches. Configure spanning tree from hp to cisco hardware server fault. Configure and troubleshoot cisco spanning tree stp. Stp spanning tree protocol explained with examples.
Hello i read that there is a limit of 128 spanning tree instances per switch if using pvst, and that any instances greater than 128 do not us spanning tree. In this post, instead of detaily talk about stp spanning tree protocol, we will focus on a basic switching loop topology and how stp mechanism helps to. To configure the cisco 3750 to use mstmultiple spanning tree use the following commands. An example of pvst per vlan spanning tree configuration on pvlan private vlan when connecting to a cisco switch. Behind the scenes some things have been changed to speed up the process, configuration wise its. 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. Cisco spanning tree protocol guide stp examples and. Which commands give stp summary information on cisco swicthes. If we want to see everything in action, well have to enable a debug.
When you connect a cisco switch to a noncisco device that supports 802. We will focus on spanning tree protocol stp configuration and verification commands in this tutorial, as implemented on cisco. So do i need to one make one one of the changes on either switch that you mentioned below, or do i make it on both. As shown in example 310, the show spanning tree active command displays spanning tree configuration details for the active interfaces only. To enable spanning tree, connect to your switch and type spanning tree mode while in global configuration mode. To enable spanning tree, connect to your switch and type spanningtree mode while in global configuration mode. Block specific ports of the switches to build a loopfree topology. Spanning tree best practice config cisco community. First, it prevents problems caused by loops on a network. How to configure spanning tree protocol root primary and root. Spanning tree port cost value calculations are based on the bandwidth of the port. Home knowledgebase cisco certified network associate ccna how to configure spanning tree protocol root primary and root secondary to configure a switch to become the spanning tree protocol stp root bridge root switch for a vlan, you can use the spanningtree vlan root command from the global configuration mode. Hi, i recently ran into this configuration on a cisco 6509 and i read that you are not supposed to enable spanning tree if you create a interface portchannel. Portfast feature causes a switch port to enter the spanning tree forwarding state immediately, bypassing the listening and learning states.
Q1 should the port configuration options of each individual line of the etherchannel bundle also be reliazed on the logical portchannel interface. How to configure trunk on cisco catalyst switch trunks are required to carry vlan traffic from one switch to another. For an ethernet network to function properly, only one active path can exist between two devices. Configure and troubleshoot cisco portchannels understanding hot standby router protocol hsrp configuring and troubleshooting cisco hsrp access layer security for the ccna.
Configure and troubleshoot cisco spanning tree stp learn how to configure stp, portfast and bpduguard on cisco switches. Cisco spanning tree protocol guide stp examples and configuration spanning tree protocol stp ensures a loopfree topology in a local area network lan made up of switches. Cisco introduced several enhancements to the standard stp operation that were later incorporated in rapid spanning tree protocol rstp defined as ieee 802. Stp spanning tree protocol explained with examples this tutorial explains what the stp protocol is and how it removes loops from the network. Mst instances with the same name, revision number, and vlantoinstance mapping combine to form an mst region.
Second, when redundant loops are planned on a network, stp deals with remediation of network. The second set contains information about the switch itself. Rootthe port given this role is the selected best path to reach the root switch. As a result, topology changes take place at different times and at different places in a switched network. First you need the spanning tree mst configuration command to enter the. Once the root switch is elected, each of the ports is given a role depending on its place within the stp topology. This command shows only the interfaces that are active on the cisco switch.
Stp spanning tree protocol example on packet tracer quiz please sign up for the course before taking this quiz. Propagation delays occur when protocol information passes through a switched lan. Spanning tree interoperability between hp and cisco switches. To view the information about the stp operation, you can use the show spanning tree command from the privilegedexec mode. We are going to shut one of the interfaces of sw1 so that the spanningtree topology changes. Vrrp is configured on the hp 8200zl switches in the core. Rstp bypass the blocking state and listenning state of stp, and provide forwarding state in 15 seconds. Rapid spanningtree is not a revolution of the original spanningtree but an evolution. Spanning tree protocolsome links below may open a new browser window to display the document you selected. As shown in example 310, the show spanningtree active command displays spanningtree configuration details for the active interfaces only. An example of pvst per vlan spanning tree configuration on. Greetings, i have a couple questions for the group. Rstp excellent summary of rapid spanning tree protocol.
Spanning tree uses the port cost value when an interface is configured as an access port and uses vlan port cost value when an interface is configured as a trunk port. It is a fast converged version of spanning tree protocol as its name implies. Understanding and configuring spanning tree protocol stp. Catalyst 4500 series switch software configuration. Portfast on switch ports connected to a single workstation or server allows those devices to connect to the network immediately, instead of waiting for the port to transition from the listening and learning. A number of cisco ios command parameters are associated with the show spanningtree command.
In this lesson i will demonstrate how to configure a trunk between cisco catalyst switches. Dec 07, 2016 this example shows how to disable spanning tree on vlan 200. Dec 11, 2019 spanning tree protocol stp is a layer 2 protocol that runs on bridges and switches. Rapid spanningtree configuration in a previous lesson i explained the differences between classic and rapid spanningtree and how rapid spanningtree works. Spanning tree protocol stp is a link management protocol that provides path redundancy while preventing undesirable loops in the network. Aug 29, 2017 spanning tree follows a strict set of rules which when learnt, will allow you to answer any stp questions you get. On ports connecting to other switches enable root guard. Apr 28, 2012 mst multiple spanning tree is able to use a number of instances and maps multiple vlans to the same spanning tree calculation. The following example configures the spanning tree bridge forwarding time to. Spanning tree protocol is standardized as ieee 802.
Table 37 shows the default spanningtree configuration for a cisco catalyst 2960. A number of cisco ios command parameters are associated with the show spanning tree command. Lan switching configuration guide spanning tree protocol cisco. Spanning tree protocol concepts and configuration cisco press. Learn stp features and functions in detail with examples. Configuration example to migrate spanning tree from. The following table lists some of the differences among the. For example, if the idlefree interfaces are closed by the system administrator, you will be able to view only the active interfaces with this command. Spanning tree protocol stp rapid spanning tree protocol rstp spanning tree protocol operation.
Mst multiple spanning tree lab on cisco catalyst switches. Spanning tree shuts down ports that are in a port fastoperational state if any bpdu is received on them. Or do you just need to determine this by using show spanning tree xxxx. 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. It is desirable to have redundant links in a switched lan so that a single link failure cannot interrupt normal operation of the network. In a valid configuration, port fastenabled ports do not receive bpdus. This chapter provides guidelines, procedures, and configuration examples. Spanning tree protocol stp is a layer 2 protocol that runs on bridges and switches. Spanning tree protocol explained step by step youtube. Nov 22, 2014 dear all, regarding best practice related to spanning tree and etherchannel, we have decided to configure following.
This lesson is an introduction to spanning tree, you will learn why we need it, how it works and how you can check the spanning tree topology on your cisco switches. A console cable that is suitable for the supervisor engine in the switch. 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. The first set contains information about the root bridge. For example, if all devices in a network have the bridge priority for vlan 100 set to the default value of 32768, entering the spanningtree vlan. Stp spanning tree protocol is a layer 2 protocol that prevents loops in the network. Receiving a bpdu on a port fastenabled port means an invalid configuration, such as the connection of an unauthorized device, and the bpdu guard feature puts the port. An example of pvst per vlan spanning tree configuration. Does the switch indicate that the 128instance limit has been reached. The output of this command can be divided into three subsets. Stp spanning tree protocol example on packet tracer. Sep 04, 2014 cbt nuggets trainer jeremy cioara explains how to configure spanning tree protocol as well as the different types of spanning tree protocols. Rapid spanning tree protocol rstp is the second stp type.
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