Spanning Tree Protocol part 4

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 15 sec

 Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
 Address 0001.4336.C86E
 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
 Aging Time 20

 Interface Role Sts Cost Prio.Nbr Type
 ---------------- ---- --- --------- -------- --------------------------------
 Fa0/1 Root FWD 19 128.1 P2p
 Fa0/2 Desg FWD 19 128.2 P2p
 Gi1/1 Desg FWD 4 128.25 P2p


 Switch0 (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 15 sec

 Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
 Address 0060.3E77.2C73
 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
 Aging Time 20

 Interface Role Sts Cost Prio.Nbr Type
 ---------------- ---- --- --------- -------- --------------------------------
 Fa0/1 Root FWD 19 128.1 P2p
 Fa0/2 Desg FWD 19 128.2 P2p
 Gi1/1 Altn BLK 4 128.25 P2p

 Switch3 (Node)
 Switch#sh span 
 VLAN0001
 Spanning tree enabled protocol ieee
 Root ID Priority 32769
 Address 0000.0C34.0432
 Cost 38
 Port 2(FastEthernet0/2)
 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

 Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
 Address 0050.0FB6.92A9
 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
 Aging Time 20

 Interface Role Sts Cost Prio.Nbr Type
 ---------------- ---- --- --------- -------- --------------------------------
 Fa0/1 Altn BLK 19 128.1 P2p
 Fa0/2 Root FWD 19 128.2 P2p


1. Selecting Root Bridge
Switch1 
Bridge Priority 32769 (32768+1)
Mac address 0000.0C34.0432
Switch2 
Bridge Priority 32769 (32768+1)
Mac address 0001.4336.C86E
Switch0
Bridge Priority 32769 (32768+1)
Mac address 0060.3E77.2C73
Switch3 
Bridge Priority 32769 (32768+1)
Mac address 0050.0FB6.92A9

Bridge Priority ??????????
Mac address
        0000.0C34.0432 < 0001.4336.C86E < 0050.0FB6.92A9 <0060.3E77.2C73

Root Bridage = Switch1 0000.0C34.0432

2. Selecting Root Port  ( Check Root Path Cost ) ??? Port ????????? Switch ????????? Root Bridge ???????? Root Path Cost ????????????????????? ????????????????? ???????? Switch ?????
Switch1  is Root Port
Switch2
Fa0/1 RPC = 0+19 = 19  (RP)
Gig1/1 RPC = 0+19+4 = 23
Fa0/2 RPC = 0+19+19+19 = 57
Switch0
Fa0/1 RPC = 0+19 = 19  (RP)
Gig1/1 RPC = 0+19+4 = 23
Fa0/2 RPC = 0+19+19+19 = 57
Switch3
Fa0/2 RPC = 0+19+19 = 38  --> Switch2 ??????? Bridge ID (Bridge Prioirty + Mac address) = 0001.4336.C86E
Fa0/1 RPC = 0+19+19 = 38  --> Switch0 ??????? Bridge ID (Bridge Prioirty + Mac address) = 0060.3E77.2C73
????? RPC ??????? ???????????????? Bridge ID ?????? ??? Switch ??? Connect ???? ??????????????????????????????? Port ID ????????????
0001.4336.C86E < 0060.3E77.2C73
??????? ???????? Fa0/2 ???? Root Port

3. Select Designated Port
  Note : ???????????????????????? Switch ????????? FastEthernet ??? GigabitEthernet ??????????????????????????? Designated Port ???? 2 ????? ????????????????????? Root Bridge ??? Root Port ?????????? ??????
1. ?????? Segment ???? Connection ??????? Switch ?? Port ?????????????????????? Designated Port ???????? ?????????? ??????????????? Designated Port ????????????????????????????????????????? Swtich ????????  ???? ??????? Root Bridge ??????????????????????? Designated Port ???????? ?????????????? Switch ????????? Segment ???? Connection ???? ??????????????? Designated Port ???????????? ??????????? Root Port ???????? ???? ????????????? Root Port ??????????????? Blocking state
2. ?? Segment ???? Connection ??????? Switch 2 ??? ????????????? Switch ????????????????????? Root Port ???????? ???????? Switch ?????????????????????????????????????????? Designated port ????????????
Spaning Tree Protocol (STP) ?????????????????????? Root port ??? Designated port ???
1. ??????????????? Root Path cost ????????????? ?????????????????? ???????????????
2. ?????????????? Designated Port ???????  Switch ??????????????? ???????????????? Switch ????? Bridge ID ?????????
   ?????????????? Root Port ?? Switch ???????????????????????????????? Switch ??????????? Bridge ID ???????
3. ?????????????????? Port ID ?????????

Switch1  ???????? Root Bridge ???? ??????????? Designated ?????????????????????????????????????????????????? Root Port

Switch2
Fa0/1 ??????? Root Port ??????
Fa0/2   ??????????????????? Fa0/1 ?? Switch0
         1. ?????????? Switch ?????????????? Root Path cost ?????????????  ???????????????????
                                     ??? 19 ???? (#show spanning-tree)
         2. ????????? Bridge ID ??? Switch ???????????????

          Switch2
          Bridge Priority 32769 (32768+1)
          Mac address 0001.4336.C86E

          Switch0
          Bridge Priority 32769 (32768+1)
          Mac address 0060.3E77.2C73

      Bridge ID = Bridge Priority + Ext-Sys-ID + Mac address ??
      ????????? Bridge Priority ??????? Switch ???????????????????????????????? Mac address
      0001.4336.C86E < 0060.3E77.2C73

??????? ???????? Switch2 ????????????????? Designated Port ??????????????????????????
                        Fa0/1 ?? Switch0 ??????????????? (elect) ????????????? Blocking state ?????.

       Gig1/1
??????????? Designated Port ????????????????????? ???????????????????????????????
                        Fa0/2 ?? Switch3 ???????? Root Port
(????????????????? Root Port ??? ? ?????? Root Port ?????????????????????????????
                         ?????????????? Root Bridge ?????????????????????? Blocking state ??????????????????????)


Switch0
Fa0/1 ???? Root Port ??????????????????
Gig1/1 ?????????????????????????? Gig1/1 ?? Switch2 ???? Designated Port ????????? Gig1/1
                                ?? Switch0 ?????? Blocking state
         ????????????? ??????????????????????? Designated Port ???????????????????????????? Root Port ???????? ??????????????? Blocking state ?????

Fa0/2 ??????????????????? Fa0/2 ?? Switch3
        1. ?????????? Switch ?????????????? Root Path cost ?????????????
Switch0 Cost ????? Root Bridge = 19 (0+19)
Switch3 Cost ????? Root Bridge = 38 (0+19+19)

??????? ????? Fa0/2 ??? Switch0 ????????????????? Designated Port ?????????????????????????? Fa0/1 ?? Switch3 ??????????????? (elect) ????????????? Blocking state ????????????
??????????? ??????????
???????????? ????????? Spanning Tree Protocol ??? 1 ?????????????????????????????????????????????

??????????????? Configuration ????????????????????
Download File STP_Ex03.pkt
????? Cisco Packet Tracer v5.3.3

Good lock ...... strumjub.






download file now

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