TAILIEUCHUNG - Spanning-Tree - Root and Port Priorities

You are not happy with the way spanning-tree is working. Your access layer switch has become your root spanning-tree switch, and you would like your distribution layer switch to serve this function. You also want to use port priorities to control which links are elected as the active links. | Lab Spanning-Tree - Root and Port Priorities Desired Root Bridge Desired Active Uplink Port 2 3 Port 1 Port 2 34 Port 12 ALSwitch 2900XL DLSwitch1 24 4006 24 Objective Modify the default behavior of spanning-tree by using root bridge and port priorities. Scenario You are not happy with the way spanning-tree is working. Your access layer switch has become your root spanning-tree switch and you would like your distribution layer switch to serve this function. You also want to use port priorities to control which links are elected as the active links. In this lab you will learn to control the operation of spanning-tree through priorities. Lab Tasks 1. Use the same configuration from the previous lab - Spanning-Tree Default Behavior . Make sure your uplink cables are connected as shown in the graphic above. 2. Look at the spanning-tree output DLSwitch1 enable sh spantree VLAN 1 Spanning tree enabled Spanning tree type ieee Designated Root Designated Root Priority Designated Root Cost Designated Root Port Root Max Age 20 sec 00-02-4b-21-36-c0 4 9152 3019 2 3 Hello Time 2 sec Forward Delay 15 sec Bridge Bridge Bridge ID MAC ADDR ID Priority Max Age 20 sec 00-02-4b-59-40-00 4 9152 Hello Time 2 sec Forward Delay 15 sec Port Vlan Port-State Cost Priority Portfast Channel_id 2 3 forwarding 3019 32 disabled 0 1 Other output deleted 2 34 blocking 3019 32 disabled 0 1 ALSwitch sh spanning-tree Spanning tree 1 is executing the IEEE compatible Spanning Tree protocol Bridge Identifier has priority 49152 address Configured hello time 2 max age 20 forward delay 15 We are the root of the spanning tree Topology change flag not set detected flag not set changes 5 Times hold 1 topology change 35 notification 2 hello 2 max age 20 forward delay 15 Timers hello 0 topology change 0 notification 0 Fast uplink switchover is enabled Interface Fa0 1 port 13 in Spanning tree 1 is FORWARDING Port path cost 3019 Port priority 128 Designated root

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