Considere que um switch recebe em cada uma das suas quatro portas (Porta 1 a P...
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Considere que um switch recebe em cada uma das suas quatro portas (Porta 1 a Porta 4) as C-BPDUs ilustradas na tabela seguinte, na qual se indica também qual o ritmo binário usado em cada uma das portas.
Porta 1 (10 Gbps)
Porta 2 (10 Gbps)
Porta 3 (10 Gbps)
Porta 4 (100 Mbps)
C-BPDU
C-BPDU
C-BPDU
C-BPDU
Protocol ID
0x0000
Protocol ID
0x0000
Protocol ID
0x0000
Protocol ID
0x0000
Version
0
Version
0
Version
0
Version
0
BPDU Type
0
BPDU Type
0
BPDU Type
0
BPDU Type
0
BPDU Flags
0x00
BPDU Flags
0x00
BPDU Flags
0x00
BPDU Flags
0x00
Root Bridge ID
32768/AA:BB:CC:00:00:11
Root Bridge ID
32768/AA:BB:CC:00:00:11
Root Bridge ID
32768/AA:BB:CC:00:00:11
Root Bridge ID
32768/AA:BB:CC:00:00:11
Root Path Cost
40
Root Path Cost
25
Root Path Cost
6
Root Path Cost
23
Bridge ID
32768/AA:BB:CC:00:00:22
Bridge ID
32768/AA:BB:CC:00:00:CC
Bridge ID
32768/AA:BB:CC:00:00:AA
Bridge ID
32768/AA:BB:CC:00:00:33
Port ID
128/2
Port ID
128/5
Port ID
128/1
Port ID
128/2
Message Age
0
Message Age
0
Message Age
0
Message Age
0
Max Age
20
Max Age
20
Max Age
20
Max Age
20
Hello Time
2
Hello Time
2
Hello Time
2
Hello Time
2
Forward Delay
15
Forward Delay
15
Forward Delay
15
Forward Delay
15
Considere que os custos associados a cada ritmo binário são dados por:
Link Speed (Bandwidth)
Cost
10 Mbit/s
100
100 Mbit/s
19
1 Gbit/s
4
10 Gbit/s
2
Calcule o valor do Designated Port Cost (DPC) deste switch.
