On the Root Bridge, you will find “This bridge is the root” message, and the root ID address and bridge ID address will be same. Search the site  In the preceding topology, first of all, we will find the Root Bridge. Rate this post CCNA 1CCNA 1 CCNA 2CCNA 2 CCNA 3CCNA 3 CCNA 4CCNA 4 CCNA v6 CoursewareĬCNA 2: Routing & Switching EssentialsĬCNA 4: Connecting Networks CCNA v5 + v6 Exam Answers CCNA v7 Exam Answers Create the following topology in Cisco Packet Tracer and connect the switches using the cross- over cables.

We will use the following topology to explain the Spanning-Tree Protocol. If you want to set a switch to be the root bridge for every VLAN in your network, then you have to change the priority for each VLAN. The priority value is set in increments of 4096. If you want that a switch should always be the root, set its priority to zero (0). The priority value can be any value from 0 through 61440. Lower value means higher preference in the root bridge election. However, you can change the priority value of a switch to forcefully make it as a root bridge. The switch with the lowest MAC address becomes the root bridge if the priority of all the switches is set as default which is 32678 plus number of VLANs. STP elects a root bridge (switch) on the network through which it passes all the network traffic. It discovers all links in the network andshut down any redundant ones in order to prevent network loops. In this exercise, we will explain how does the spanning-tree protocol work? STP help a switch to avoid the loop avoidance.

But there is a protocol called Spanning-Tree Protocol (STP) that is used to stop switching loops in a layer-2 switched network. If you have a network based on layer-2 switches and if the switches are interconnected using the redundant links, your network may suffer from the switching loops. Unfortunately they (routing protocols) cannot be used to stop loops from occurring at the Data Link layer of the OSI model. Routing protocols such as RIP and IGRP have their own techniques to stop network loops from occurring at the Network layer of the OSI model. Share  Tweet Share Pin it Reddit Lab 124: Conguring Spanning-Tree Protocol  |  Last updated on: |  120 Labs for Cisco CCNA 200-125 and CCENT Exams |  No Comments Network loop can create a huge problem in a network.

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