Qtech QSW-2900-24T4-AC [146/209] Table 5 comparison process and result on each device
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Qtech QSW-2900-24T4-AC [146/209] Table 5 comparison process and result on each device

Qtech QSW-2900-24T4-AC [146/209] Table 5 comparison process and result on each device
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· Comparison process and result on each device
The following table shows the comparison process and result on each device.
Table 5 Comparison process and result on each device
Device Comparison process
BPDU of port after
comparison
Device A
· Port AP1 receives the configuration BPDU of Device
B {1, 0, 1, BP1}. Device A finds that the
configuration BPDU of the local port {0, 0, 0, AP1}
is superior to the configuration received message, and
discards the received configuration BPDU.
· Port AP2 receives the configuration BPDU of Device
C {2, 0, 2, CP1}. Device A finds that the BPDU of
the local port {0, 0, 0, AP2} is superior to the
received configuration BPDU, and discards the
received configuration BPDU.
· Device A finds that both the root bridge and
designated bridge in the configuration BPDUs of all
its ports are Device A itself, so it assumes itself to be
the root bridge. In this case, it does not make any
change to the configuration BPDU of each port, and
starts sending out configuration BPDUs periodically.
AP1: {0, 0, 0, AP1}
AP2: {0, 0, 0, AP2}
· Port BP1 receives the configuration BPDU of Device
A {0, 0, 0, AP1}. Device B finds that the received
configuration BPDU is superior to the configuration
BPDU of the local port {1, 0, 1, BP1}, and updates
the configuration BPDU of BP1.
· Port BP2 receives the configuration BPDU of Device
C {2, 0, 2, CP2}. Device B finds that the
configuration BPDU of the local port {1, 0, 1, BP2}
is superior to the received configuration BPDU, and
discards the received configuration BPDU.
BP1: {0, 0, 0, AP1}
BP2: {1, 0, 1, BP2}
Device B
· Device B compares the configuration BPDUs of all
its ports, and determines that the configuration BPDU
of BP1 is the optimum configuration BPDU. Then, it
uses BP1 as the root port, the configuration BPDUs
of which will not be changed.
· Based on the configuration BPDU of BP1 and the
path cost of the root port (5), Device B calculates a
designated port configuration BPDU for BP2 {0, 5, 1,
BP2}.
· Device B compares the computed configuration
BPDU {0, 5, 1, BP2} with the configuration BPDU
of BP2. If the computed BPDU is superior, BP2 will
act as the designated port, and the configuration
BPDU on this port will be replaced with the
computed configuration BPDU, which will be sent
out periodically.
Root port BP1:
{0, 0, 0, AP1}
Designated port
BP2:
{0, 5, 1, BP2}
Device C
· Port CP1 receives the configuration BPDU of Device
A {0, 0, 0, AP2}. Device C finds that the received
configuration BPDU is superior to the configuration
BPDU of the local port {2, 0, 2, CP1}, and updates
the configuration BPDU of CP1.
CP1: {0, 0, 0, AP2}
CP2: {1, 0, 1, BP2}

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