Apps Media

Spanning Tree Protocol part 3 Spanning Tree Protocol part 3 ??????????? 2 ???????????????? Spanning Tree Protocol ?????? 1. Selecting Root Bridge :   Bridge ID = Bridge Priority + Mac Address 1.1 Bridge Priority  ????????????? Bridge ID Priority = Bridge Priority+VLANID Bridge Priority= 32768 (2^15) VLAN ID = 10 Bridge ID Priority  = 32768+10 = 32778 Note: STP ??? VLAN 1.2 Mac address  090.2BD3.1E18< 00D0.BC1B.9B88 < 00D0.FFE3.5895 Root Bridge = 0090.2BD3.1E18 (Switch1)  2. Selecting Root Port ( ??????????????????????????? Root Bridge ????? Root path Cost ?????????? ?????????????????????????? IEEE ) ??? Root Path Cost (Cumulative path cost)  ???????????? Root Bridge Port (Port ???????? ????????? 0 ????????????????? Root Bridge) ????? Port ?? Switch ????? ?? Multilayer Switch0 ??????? Root Port  ??? Root Path Cost  Gig0/1 ?? Root Path Cost = 23 ??????? = Fa0/24 ?? Root Bridge (0) > Gig1/1 ?? Switch0 (+19) > Gig0/1 ...

Spanning Tree Protocol Spanning Tree Protocol ?????????????? Spanning Tree  ???????????? ?????????????????????????????????????  ??? Switch/Bridge ????????? ?????????????????????????????????????????? (fault tolerance) ????????? ??????????????????????????????????????????????? ????????????????????????? ????????????????????????? ???????????? Switch ?????????? ?????????????????????????????????? Network ?????? Switch ???????????????????????????????????????????????????? ???????????? Bridge Loop  ??? Bridge Loop ??????????????????????????? Switch ?????????????????????????????????? Switch ??????? ???????????? Network ??? Switch ??????? ???????? CPU Switch 100% ???????????????????????? Spanning Tree Algorithm ?????????????????????? ??????? Bridge Loop ?? Network Switch ????????????????? Bridge Loop ?? Switch        ?????? Spanning Tree Protocol (STP) ??????????????????????????????????????????????????????????????????????? ???????????????????????? "block" ??? Por...

Spanning Tree Protocol on Packet Tracer Let us apply STP on packet tracer. Let us develop a basic topology like the one in the following diagram. As we can see in the above diagram that some light are green while others are orange. Y is it so ? We will see that in a moment. Let us try to communicate between two Hosts. Assign IP addresses to all hosts As we can see in the figure below, the communication is successful. It is due to the spanning tree protocol applied on the switch by default. It provides us with the loop free environment. It calculates the cost of each path and provides us with the one that has the minimum cost. That is the reason that some links are up while others are down with the orange light. So let us see what happens if we remove the spanning tree protocol from this topology. We will remove STP from all the switches one by one. After removing STP, we have observed by the following diagram, a couple of changes. i.e. all the lights are green. In fact, some are...

spanning tree MST on Cat 6500 4500 3500 use the same network from previous lab, just remove the 3560 and Po64 lets focus on the two link between CORE1 and CORE2, and take VLAN 10, 20 as an example before we go tot MST, theres something i forgot to mention on previous lab, this is one way to do the load balancing without using Etherchannel CORE1#sh span vl 20 ... Interface        Role Sts Cost      Prio.Nbr Type ---------------- ---- --- --------- -------- -------------------------------- Gi1/1            Desg FWD 4         128.1     P2p Gi1/2            Desg FWD 4         128.2     P2p Gi1/3            Desg FWD 19        1...

Spanning Tree Protocol part 4 Spanning Tree Protocol part 4 ??????????????????? Switch  ??????????????????????????? ??????? ??????????? 1 ??? ??????????? 2 ???????????? Network ??????????????? ??????? Command Show Spanning Tree ??? Switch ??????????????????? Switch1 Switch#sh span VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 0000.0C34.0432 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 0000.0C34.0432 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 20 Interface Role Sts Cost Prio.Nbr Type ---------------- ---- --- --------- -------- -------------------------------- Fa0/1 Desg FWD 19 128.1 P2p Fa0/2 Desg FWD 19 128.2 P2p Switch2 (Node) Switch#sh span VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 0000.0C34.0432 Cost 19 Port 1(FastEthernet0/1) Hello Time 2 sec Max Age 20 sec Forward Delay ...

Spanning Tree Protocol part 2 Spanning Tree Protocol part 2 ??????????????????????????? ??????? ??????? Spanning Tree Protocol ??? 1 ??????????????? ??????????? 1                  ?????????????????? Network ??????? Switch ?????? DP=Designated Port RP = Root Port ?????? = BLK Port (Blocking State) ?????????????????????  1. Selecting Root Bridge :   ( Bridge ID = Bridge Priority + Mac Address ) 1.1 ?????? Bridge Priority ??????????????? ????????????????????????                                 Bridge ID Priority = Bridge Priority+VLANID Bridge Priority= 32768 ( by default ) VLANID = 1  ( ???????????????? VLAN ?????????) Bridge ID Priority  = 32768+1 = 32769 1.2 ??????? Mac address ???????????????                                 0001.649C.E579 < 0001.9...