Qtech QSW-2800v2 Руководство пользователя онлайн [191/230] 481607

Qtech QSW-2800v2 Руководство пользователя онлайн [191/230] 481607
Chapter8 Reliability Configuration
8-9
The AP1 port and AP2 port of Switch A will receive the message from SwitchB
and SwitchC respectively. SwitchA will compare the port priority vector of AP1
port and AP2 port with the message priority vector from other Switch. Because
the port priority vector of port AP1 and AP2 are better than the message priority
vector carried in the message, the role of port AP1 and AP2 does not change and
is still the designated port and SwitchA is the total root and is the domain root of
SwitchA and SwitchB. Since then, the port will send out the message which
makes itself to be the root regularly.
b) Switch B Role Selection Process
After the BP1 port of SwitchB receiving the message from the CP1 port of
SwitchC, it will compare the message priority vector with the port priority vector.
Because the port priority vector is better than the message priority vector, the role
of the port will not be updated.
After the BP2 port of SwitchB receiving the message from the AP2 port of SwitchA,
the process is as follow.
(1) Compare the message priority vector of port with the port priority vector. Because
the message priority of port is better than the port priority vector, the port priority
vector will be updated to be the message priority vector {A:0:A:0:A:AP2:BP2};
(2) Calculate the root path priority vector of port. SwitchA and SwitchB are in the
same domain. The port root path priority vector is {A:0:A:10:A:AP2:BP2};
(3) Calculate the root priority vector of SwitchB. Only the root path priority vector of
BP2 port is from other device. Because the root path priority vector of BP2 port is
better than the bridge priority vector of SwitchB, the root priority vector of SwitchB
is {A:0:A:10:A:AP2:BP2};
(4) Specify the priority vector calculation. The designated priority vector of BP1 port
is {A:0:A:10:B:BP1:BP2}. The designated priority vector of BP2 port is
{A:0:A:10:B:BP2:BP2}.
Determine the role of the port: Compare the designated priority vector with the port
priority vector of the BP1 port and BP2 port. Because the designated priority vector of
BP1 is better than the port priority vector, the role of BP1 is the designated port and
the BP1 port sends out the designated priority vector {A:0:A:10:B:BP1:BP2} which
makes the SwitchA to be the total root and domain root regularly. Because the port

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