5.1.9 Packet Tracer - Investigate STP Loop Prevention

investigate stp loop prevention you will observe spanning report states and watch the spanning tree comprehense process observe a convergent sparring tree instance verify connectivity ping from pc1 to pc2 okay from pc one pick pc2 pc one command prom ping 182 160 a1 101 the destination is pc2 101 enter success view expanding three status on each switch so spanning three belong one okay first as one go to s1 okay enter enable show spanning dash 3 1 enter okay use this command to gather information about the spanning tree status of each switch complete the table okay gigabit zero one okay uh for vlan for vlan one okay vlan one belong one only show the spanning tree for vlan one okay vlan one gigabit zero one and zero two gigabit zero one and zero two the connection for the switches [Music] gigabit zero one zero two okay gigabit zero one okay gigabit zero one status forwarding route bridge no because is designated for gigabit zero two status forwarding route bridge yes is root okay okay that means that using gigabit 02 on s1 you will reach the root bridge this is the path to reach the root bridge okay s2 enter enable show spawning three belong one okay s2 gigabit zero one gigabit zero one minus two okay this interface you could be zero one on s2 status forwarding root bridge now because it's designated for gigabit zero two okay this is another board gigabit zero two and this status forwarding route bridge now it's designated board okay very good and look at this all these ports are designated gigabit 02 and gigabit 01 are designated ports so that means s2 is the root okay this bridge is the root okay very nice and s3 enter enable show spinning three belong one gigabit zero one gigabit zero one okay status forwarding root bridge yes root root root port okay gigabit zero one gigabit zero one so that means you you will use gigabit zero one on s3 to reach the root bridge okay and gigabit zero two gigabit zero two okay this another port status okay blocking mode blocking modes okay so that's why is orange is is in blocking mouse okay root bridge node alternate import alternate imports okay so that's why it's orange very very good [Music] what do you think this link light means okay it indicates that the port is not forwarding frames because it is in a spanning tree state in this case the blocking state okay is blocking blocking mode blocking state so that that's why it's orange what part will frames take from pc1 to pc2 okay if gigabit co2 on s3 is blocked pc1 will go through s1 through s2 and reach pc2 this path okay s1 s2 pc2 why do the frames not travel through s3 okay because no frames are sent or received on gigabit 02 on s3 okay this is a blocking port on s3 why has spanning tree place it apart in blocking state if all ports could forward frames a switching loop would exist in the network switching loops can degrade network performance and even cause a network to fail okay observe spanning tree convergence remove the connection between s1 and s2 open command line interface window on s3 okay go to s3 command line interface show spanning three belong one okay show expanding three belong one enter okay leave the command line interface window open okay leave this open select the delete tool from the menu bar and click the cable that connects as one ls2 okay and place this here and okay this is the tool that the lats tool but before to select this tool look at this quickly return to command line prompt on switch s3 and issue the show spanning tree belong one command use the up arrow key to recall the show spanning tree belong one command and issue it repeatedly until the orange link light on the cable turns green and observe the status okay and okay this is the s s3 command line interface and now and select the delete tool okay now and remove this remove this link between s1 and s2 remove this link okay and go to this uh command line interface repeat show a spanning tree belong one shower spanning tree belong one enter show as many three belong one enter repeat enter repeat enter repeat enter repeat enter and now is gigabit tier 2 is listening okay gigabit zero to listen repeat enter repeat enter repeat enter repeat enter now is learning gigabit zero two learning gigabit zero two learning repeat enter repeat enter repeat enter repeat enter now is forwarding so that's why forwarding is the green indicator and a stop okay what do you see happen to the status of the gigabit 002 port during this process okay first was in blocking and then became listening then learning and finally forwarding you have observed the transition import the status that occurs as a spanning tree port moves from blocking to forwarding state verify connectivity ping from pc1 to pc2 okay access pc1 command prompt and repeat the ping ping to pc2 101 101 enter success are any parts showing an orange link light that indicates that the port is in a spanning tree state other than the forwarding why or why not okay no orange lights okay all green indicators no orange link lights are shown because they are no longer red and that but in the network no redundant but all green okay thank you very much you

Channel: Christian Augusto Romero Goyzueta

Views: 5,354

Rating: 4.9111109 out of 5

Keywords: switching, routing, wireless, essentials, srwe, ipv4, switch 2960, switch, stp, spanning tree protocol, loop, loop prevention, listening, learning, forwarding, blocking, redundant path

Id: 5A3l-ICbLDI

Length: 12min 57sec (777 seconds)

Published: Sun Aug 02 2020