Break down the show commands to understand the root election process. First, it prevents problems caused by loops on a network. This command is executed in global configuration mode and places you into mst multiple spanning tree configuration mode. However, they also support rapid spanning tree protocol rstp802. 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. Chapter 7 configuring stp and rstp stp features stp overview stp is a layer 2 link management protocol that prov ides path redundancy while preventing loops in the network. Log in to the web configuration utility and choose spanning tree stp interface settings. Therefore, the best configuration for stp interoperability is to have the bridge stp feature enabled and. February 28, 2012 basic switch configuration cisco ios basic switch functions, names and passwords the switch name is tool to let us see what device we are connected to. Stp will identify if there are any loops, and then disable or block.
Cisco 2100 series configuration manual pdf download. Portfast is a cisco network function which can be configured to resolve this problem. The arista switch is configured with a lower priority to become the root bridge. Stp spanning tree protocol step by step ciscoforall. It does this by temporarily blocking redundant paths between switches.
I discuss how stp mitigates layer 2 loops and layer 2 broadcast storms. Through the meraki dashboard, you can configure networkwide stp settings including enabling rstp and setting the bridge priority on ms switches. Its referred to as rapid because the convergence timeis a little faster than 802. Network redundancy is a key to maintaining network reliability. Spanning tree protocol stp in packet tracer part 1. It also explains how to configure stp and rstp on the mlseries card. The focus of this topic is to describe how spanning tree protocol can solve common looping problems in a redundant switched network. Edc0 hello time 2 sec max age 20 sec forward delay 15 sec aging time 20 interface role sts cost prio. We are calculating a rapid spanning tree for each vlan. In addition, pvst per vlan spanning tree is enabled in the cisco switches by default.
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 protocol stp stp is a layer 2 protocol, used for removing loops. If you have configured a new username or password, enter the credentials instead. Stp is enabled by default on all cisco switches, for all vlans. Discover how a switchs bridge id is derived in both traditional and extended modes. 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. The device supports the following spanning tree protocol versions. Select set the bridge priority for another switch or stack 2. Choose a type of interface from the interface type dropdown list.
This lab will discuss and demonstrate the configuration and verification of 802. The spanning tree protocol stp is a network protocol that ensures a loopfree topology for any bridged ethernet local area network. Stps main task is to stop network loops from occurring on your layer2 network bridges or switches. The time spanning tree protocol stp takes to transition ports over to the forwarding state can cause problems. In a network of cisco switches connected through 802. Networkwide stp configurations can be made from the. A catalyst 4500 series switch use stp the ieee 802. Cisco introduced several enhancements to the standard stp operation that were later incorporated in rapid spanning tree protocol rstp defined as ieee 802.
Second, when redundant loops are planned on a network, stp deals with remediation of network. The implementation of rapid spanning tree is rapidpvst. Spanning tree also allows a network design to include spare redundant links to provide automatic backup paths. Technically, there are only two types of bpdus in 802. Spanning tree protocol configuration examples and technotes. It vigilantly monitors the network to find all links, making sure that no loops occur by shutting down any redundant links. 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. Spanning tree protocol overview the plugandplay spanning tree protocol stp, a layer 2 protocol that ensures a loopfree topology in bridged lans, has been around for decades. For backup purpose we typically create backup links for important resources. The main purpose of stp is to ensure that you do not create loops when you have redundant paths in your network. Stp is available only when the access point is in bridge mode. Cisco ios router configuration commands cheat sheet pdf.
For all packet tracer examples and files, you can check packet tracer labs page. How to connect two routers on one home network using a lan cable stock router netgeartplink duration. Now, the first thing we might want to do in our environment is choose a spanningtree protocol type. Spanning tree protocol in layer 2layer 3 environments. Stp multicasts frame that contain information about switch interfaces. Cisco ios software configuration guide for cisco aironet access points. To learn how to access an smb switch cli through ssh or telnet, click here.
Switches running stp will build a map or topology of the entire switching network. Configuring spanning tree on meraki switches ms cisco. Ethernet card software feature and configuration guide 7 configuring stp and rstp this chapter describes the ieee 802. View and download cisco 2100 series configuration manual online. 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. By default, a single spanning tree runs on each configured vlan. Configure the ethernet interfaces of pc1, pc2, pc3, and pc4 with the ip address, subnet mask, and gateway indicated in the addressing table at the beginning of the lab. On each switch, display the spanning tree table with the show spanningtree command. Multispanning tree protocol allows for resource conservation by now requring an instance for every single vlan in the layer 2 network. The bridges send configuration bpdus through the ethernet and radio ports. The neighbor must match on all parameters in this list except the stp settings.
Bridge assurance ba is a feature that provides additional protection in environments running the spanning tree protocol stp. Spanning treeenabled switches go through a root election process based on bridge p rotocol data unit. You can configure the stp bridge priority of any meraki switch in your network from the stp bridge priority field 1. We will focus on spanning tree protocol stp configuration and verification commands in this tutorial, as implemented on cisco switches. In this topology, 2 cisco catalyst 295024 switches and 6 pcs are used. Classic stp provides a single path between any two end stations, avoiding and eliminating loops. Under switchesstacks, enter the name of the switch or switch stack on which you want to configure the stp priority 3. Switch configuration by the end of this session, you will be able to. There are no specific requirements for this document. You can use the debug spanningtree bpdu command to view bpdus are are sent or received. 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. Cisco spanning tree protocol guide stp examples and. Ba works by forcing a bridge to send bpdus on a network port, even if that port is not a designated port.
Understand the configuration commands necessary to disable spanning tree protocol either globally on a switch or per port. Bug information is viewable for customers and partners who have a service contract. Also configure the vty lines 0 to 15 with the password cisco. It vigilantly monitors the network to find all links, making sure that no loops occur by blocking any redundant ones. Lab 71 configuring routing information protocol rip lab 72 configuring rip versions 1 and 2. Spanning tree protocol stp is a layer 2 protocol that runs on bridges and switches. Jun 27, 2017 how to connect two routers on one home network using a lan cable stock router netgeartplink duration. Thats itjust one command will enable rapid spanning tree on our switches.
Presentation et configuration du protocole spanning tree. Understanding spanning tree protocol 2 cisco 3200 series wireless mic software configuration guide stp forces redundant data paths into a standby blocked state. You can download the cisco packet tracer example with. When you are finished, return to global configuration mode by entering the exit command or pressing ctrlz. Spanning tree protocol stp spanning tree protocol stp was developed to prevent the broadcast storms caused by switching loops. The basic function of stp is to prevent bridge loops and ensuing broadcast radiation. Configure stp settings on a switch through the cli cisco. This command is executed in global configuration and configures the switch to use the ieee 802. Instructor alright, so lets mess around with some of the stp configurations in the real world. Chapter 17 configuring stp and mst default stp configuration stp and ieee 802. Stp network port configuration can be done globally or a per interface basis. This factor of time is not an issue for many people, but it can cause problems for some. If a network segm ent in the spanning tree fails and a redundant path exists, the spanningtree algorithm recalculates the spanningtree topology and activates the standby path.
Cisco router configuration step by step pdf youtube. In our scenario, all offices have backup links that create loops in topology. Complete the reflection questions that accompany the pdf file for this activity. In this sample chapter from scaling networks v6 companion guide, explore potential redundancy problems, symptoms, and protocols to manage them. What is called tca is simply a regular configuration bpdu, type 0x00, with the tca flag set. Rapid stp rstp detects network topologies to provide faster convergence of the spanning tree. Hi we are in a process where we have to connect the hp switches to the cisco switches in the network.
Port from the port dropdown lists choose the port to configure. Now, this is a ciscobased spanning tree protocolimplementation that can create an instance per vlan. To do so, the switches either use pagp or lacp if already in use, or cisco discovery protocol cdp if using manual configuration. Presentation et configuration du protocole spanning tree stp. Configuring spanning tree on meraki switches ms cisco meraki. Cisco press 201 west 103rd street indianapolis, in 46290 usa cisco router con. The prompt will display the name of the switch so sw1 tells us that we are connected to a switch named sw1. Stp spanning tree protocol vlan virtual local area network supported spanning tree protocols arista switches use multiple spanning tree protocol mstp802.
For a layer 2 ethernet network to function properly, only one active path can exist between any two stations. To enable spanning tree, connect to your switch and type spanningtree mode while in global configuration mode. Understanding and configuring spanning tree protocol stp. Spanning tree protocol concepts and configuration cisco press. Edc0 this bridge is the root hello time 2 sec max age 20 sec forward delay 15 sec bridge id priority 32769 priority 32768 sysidext 1 address 0001. Cisco switches will be used for the hands on exercise however this is not a cisco course. 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 avoid this switching loop.
In the dropdown under the bridge priority, select the stp priority. Understanding and configuring spanning tree protocol. You can also control port level stp settings including enabling or disabling rstp on a port, and configuring stp guards. Edc0 hello time 2 sec max age 20 sec forward delay 15 sec aging time 20. Registered users can view up to 200 bugs per month without a service contract. Stp spanning tree protocol step by step configuration. Configuring multiple spanning tree protocol mstp free. Now as per our recent studies, we have figured out that the hp switches does not supp. In addition, switches check the settings on the neighboring switch. Feb 22, 2012 a beginners tutorial on the function and purpose of stp spanning tree protocol in a local area network. Stp configuration between cisco and hp hewlett packard. Lab 77 configuring rip default information originate. Spanning tree protocol interoperability with cisco arista networks.
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