Spanning Tree Protocol part 3

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 ?? Multilayer Switch0 (+4) = 23 (0+19+4)  

Gig0/2 ?? Root Path Cost = 4

??????? =Gig1/1 ?? Root Bridge (0) > Gig0/2 ?? Multilayer Switch0 (+4) =4 (0+4) 

?? Switch0

??????? Root Port  ??? Root Path Cost

Fa0/24 ?? Root Path Cost  = 19

??????? = Fa0/24 ?? Root Bridge (0) > Gig1/1 ?? Switch0 (+19) =19 (0+19)  

Gig1/1 ?? Root Path Cost = 8

??????? = Gig1/1 ?? Root Bridge (0) > Gig0/2 ?? Multilayer Switch0 (+4) > Gig1/1 ?? Switch0 (+4) = 8 (0+4+4) 

Root Port ?? Multilayer Switch0 ??? Gig0/2 , ?? Switch0 ??? Gig1/1 ??????????? Cost ?????????????????????? port ????????? Switch ?????

3. Selecting Designated Port ????? Segment (??????????????????????? Root Path Cost ????????? ???????????????????????????????????????????? Root Bridge ??????????????????????? ?? Segment ????????  ????? 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 ????????????

??????????????? Spanning Tree Protocol ??? 1 

?? Segment 1 : 

???????? Root Bridge ??? ????? Fa0/24 ????????????? Designated Port ??? Segment 1 ????????????????????  Port Connection ????? Fa0/24 ?? Switch0 ???????????? Blocking state ???????? 1

?? Segment 2 : 

?????  Gig1/1 ?? Switch0 ????????????? Root Port ???????? ????????? Port Gig0/1 ?? Multilayer Switch0 ???????????????????????????? Designated Port ??? Segment ????????????????? 2

Designated Port ??? 

Fa0/24 , Gig1/1 ?? Root Bridge

Gig0/1 ?? Multilayer Switch0

4. Selecting Blocking Port (???? Port ???????????????????????????????? Root Port ??? Designated Port )

Fa0/24 ?? Switch0 ???????????? Blocking state 

??????????????? Configuration ????????????????????
Download File STP_Ex02.pkt

????? Cisco Packet Tracer v5.3.3

Good lock ...... strumjub.

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