Spanning tree protocol stp resolves redundant topologies into loopfree, treelike topologies. To enable spanning tree, connect to your switch and type spanningtree mode while in global configuration mode. If you havent seen it before, i would recommend to look at it first before diving in the configuration having said that, lets look at the configuration. Catalyst 4500 series switch software configuration. Cisco spanning tree protocol guide stp examples and.
The basic function of stp is to prevent bridge loops and the broadcast radiation that results from them. Enhance productivity and help network and security administrators and channel partners deploy routers with increased confidence and ease. This chapter describes how to configure the spanning tree protocol stp on a catalyst 4500 series switch. Though it is generally a set it and forget it protocol,its important to understandhow to implement changesto affect traffic controland not just initial configuration. Understanding and configuring spanning tree protocol stp cisco. Instructor alright, so lets mess around with some of the stp configurations in the real world. The cisco implementation of mstp is often referred to as multiple spanning tree mst.
When switches are interconnected via multiple paths, stp prevents loops from being formed. Browse library role iq skill iq iris authors professional services. In a previous lesson i explained the differences between classic and rapid spanningtree and how rapid spanningtree works. First, it prevents problems caused by loops on a network. Ccna stp tutorial by jagvinder thind shows stp configuration in packet tracer in hindi or how to configure stp spanning tree protocol in hindi.
Now, the first thing we might want to do in our environment is choose a spanningtree protocol type. Use the no spanningtree vlan vlanid command in order to disable stp on a per virtual lan vlan basis. Understanding and configuring spanning tree protocol stp. This is because layer 2 ethernet frameshave no time to live or time out mechanismbuilt into the frame. User guide for cisco configuration professional for. If designed properly, stp can be used to perform loadbalancing between network. Stp modes that are supported on cisco configuration professional for catalyst are. Without manual configuration all switches have the same priority therefore it is up to the mac address to decide upon the root bridge.
First, you will explore rapid spanning tree protocol. Configure and troubleshoot cisco spanning tree stp. The bridges send configuration bpdus through the ethernet and radio ports. Refer to these documents for information on the configuration of stp on other switch platforms. The default configuration for local span session ports is to send all packets untagged. Includes a list of key commands and an in depth look at broadcast storms and loops, electing root and port bridges, stp basic rules and limitations, troubleshooting and resource errors. Upon completion of this course, you will be prepared for the cisco certified network professional ccnp routing and switching certification exams 300101 route, 300115 switch, and 3005. User guide for cisco configuration professional for catalyst. In this article we look at what spanning tree protocol is and how you can use it to avoid bridge storms.
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. Many cisco switches are still connected on the hp some in daisychaining. Mst is a new ieee standard derived from cisco s proprietary multiinstance spanningtree protocol mistp implementation. It is desirable to have redundant links in a switched lan so that a single link failure cannot interrupt normal operation of. How to configure vlan, stp, dtp step by step guide. Catalyst 2960, 3560, 3750, 3850, 4500, 6500 mst was developed to reduce the number of spanning tree instances to reasonable value thus reducing cpu cycles needed to calculate stp for each vlan separately. Span also does not normally monitor bridge protocol data unit bpdu packets and layer 2 protocols, such as cisco discovery protocol cdp, vlan trunk protocol vtp, dynamic trunking protocol dtp, spanning tree protocol stp, and port aggregation.
Gokhan kosem for his wonderful efforts for building this site. Thank you gokhan for taking the time to share his knowledge with providing network concept very simply and deploy professional education website for network engineers. By definition, stp is used to prevent loops in switching architecture and it is enabled by default on most products. An stp loop or forwarding loops can occur when the entire network fails because of a hardware failure, a configuration issue, or a network attack. This chapter also describes how to configure the ieee 802. The spanning tree protocol stp prevents loops from forming in a switched network, but it does this task inefficiently by comparison with the processing capabilities of modern equipment. Lecturer spanningtree configuration is another one of the key topicscovered in the switching exam. A number of cisco ios command parameters are associated with the show spanningtree command. The cisco configuration professional for catalyst provides network administrators with a single solution for. Your software release may not support all the features documented in this module. The problem is that when we create redundancyat a layer 2 level of our networks,we create loops that traffic will traverse indefinitely. A network professional whose duties include switch administration may be required to decide which type of spanningtree protocol to implement.
Rootthe port given this role is the selected best path to reach the root switch. This page is designed to help you quickly find what you are looking for by. As shown in example 310, the show spanningtree active command displays spanningtree configuration details for the active interfaces only. Cisco nexus 5000 series switch cli software configuration guide ol1659701 1 configuring mst multiple spanning tree mst, which is the ieee 802. It simplifies router, firewall, intrusion prevention system ips, vpn, unified communications, wan, and lan configuration with easytouse wizards. Stp and mst catalyst 65006000 switches that run cisco ios software configuring stp and mst catalyst 4500. Thank you gokhan for taking the time to share his knowledge with providing network concept very simply and deploy professional education website for.
Cisco switching and spanning tree protocol stp basics. Lets take a look at how spanningtree works and what it does. With mst, you can map a single spanningtree instance to several vlans. 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. Cisco configuration professional for catalyst data sheet. Understanding how ethernet works in an enterprise environment is one of the most common skills required by a network engineer. According ccna outing and switching practice test editoria sybex in 2017 question 2. Software configuration guide, cisco ios release 15.
Understanding and configuring spanning tree protocol stp on catalyst 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. 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. And of course without spanning tree we cant have redundant pathways across our lan, and without spanningtree we cant utilise those redundant paths with etherchannel. Enhanced interior gateway protocoleigrp, a cisco proprietary protocol. Second, when redundant loops are planned on a network, stp deals with remediation of network. For the latest caveats and feature information, see bug search. The spanning tree protocol stp is a network protocol that builds a loopfree logical topology for ethernet networks. The spanning tree feature cannot be turned off in switches on a per port basis. If it receives bpdu it will disable the spanning tree from this port. Spanning tree also allows a network design to include backup links providing fault tolerance if an active link fails as the name suggests, stp creates a spanning tree that.
The spanning tree port priority range is from 0 to 255, configurable in increments of 4. This article takes a look at the rapid spanning tree protocol rstp, which was designed to take over the duties of stp. Welcome to the 350401 cisco enterprise network core technologies study material page. Spanning tree protocol stp is a network protocol that builds a logical loopfree topology for ethernet networks.
Hi all, on my 2950 switch, how do i determine what version of stp im running. The switch with the lowest mac address value is elected as the root bridge. Here is one networking configuration step that seems to get overlooked. The following table lists some of the differences among the. Stp or rstp i entered sh span detail and it says vlan0001 is executing the ieee compatible spanning tree protocol. Network loop prevention with the rapid spanning tree. How to configure standalone cisco access point from gui and configure wpa2 authentication duration. In this example, we will configure rstp rapid spanning tree protocol with packet tracer. Download for free the latest versions of cisco s configuration professional, network assistance and anyconnect secure mobility client. In this configuration stp will block these ports f024 of s1, f023 and f024 of s2 and f024 of s3 to avoid loop at layer to two. On a site, i changed the campus core with an hp 10504. All those are configured with multiple vlans and routing is also enable. All are available for windows, macos and linux platforms. In addition of those types of stp there is another one called rapid spanning tree protocol ieee 802.
Cisco configuration professional express router version. In case if any links drop between two switches and auto backup from other side. In this course, stp and etherchannel operation and configuration, you will learn about creating redundant layer 2 networks with spanning tree protocol. The goal for both are fast convergence when there is a topology change on the network. Catalyst 3750 switch software configuration guide, cisco ios release 15. Bottom line here is that a thorough understanding of spanningtree and its benefits is a. Stp and etherchannel operation and configuration pluralsight. Cisco software uses the port priority value when an interface is configured as an access port and uses vlan port priority values when an interface is configured as a trunk port.
Software configuration guide, cisco ios xe denali 16. Configuring stp and mst catalyst 45004000 switches that run cisco ios software. Lan switching configuration guide spanning tree protocol. Cisco configuration professional ccp is a gui device management tool for cisco access routers. Bridge id, bridge protocol data units, root bridge, stp protocol. Lan switching configuration guide spanning tree protocol cisco. Although it is not recommended, you can turn off spanning tree protocol stp on a pervlan basis, or globally on the switch. Cisco configuration professional for catalyst data sheet cisco. I dont know if the answer has changed because cisco has changed their protocols.
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