Qtech QSW-2800v2 Руководство пользователя онлайн [192/230] 481607
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Qtech QSW-2800v2 Руководство пользователя онлайн [192/230] 481607

Qtech QSW-2800v2 Руководство пользователя онлайн [192/230] 481607
Chapter8 Reliability Configuration
8-10
priority vector of BP2 is better than the designated priority vector and the root priority
vector is from the root path priority vector of BP2 port, the role of BP2 is the root port.
c) Switch C Role Selection Process
The CP1 port of SwitchC receives the message priority vector {B:0:B:0:B:BP1:CP1}
not updated of SwitchB. The CP2 port receives the message priority vector
{A:0:A:0:A:AP1:CP2} from SwitchA. By comparing separately, the message priority
vector of CP1 and CP2 are all better than the port priority vector. So the port priority
vector of CP1 and the port priority vector of CP2 are separately updated to be
{B:0:B:0:B:BP1:CP1} and {A:0:A:0:A:AP1:CP2}. Because SwitchC is not in the same
domain with SwitchA and SwitchB, the root path priority vector of CP1 port is
{B:5:C:0:B:BP1:CP1} and the root path priority vector of CP2 is {A:4:C:0:A:AP1:CP2}.
The root path priority vector of CP2 is better than the root path priority vector of CP1,
the root priority vector is {A:4:C:0:A:AP1:CP2}. The designated priority vector of CP1
and CP2 are separately the {A:4:C:0:C:CP1:CP2} and {A:4:C:0:C:CP2:CP2}. The
CP1 port is calculated to be the designated port and the CP2 port is calculated to be
the root port.
The CP1 port of SwitchC receives the updated message priority vector
{A:0:A:10:B:BP1:CP1} from BP1. By comparing, the message priority vector of CP1 is
better than its port priority vector and then it will update the port priority vector to
be{A:0:A:10:B:BP1:CP1}. The calculated root path priority vector of CP1 port is
{A:5:C:0:B:BP1:CP1}. Because the message priority vector received by CP2 port is
not changed, according to the above calculation, the root path priority vector of CP2
port keeps to be {A:4:C:0:A:AP1:CP2}. The root path priority vector of CP2 is better
than the root path priority vector of CP1, the root path priority vector is
{A:4:C:0:A:AP1:CP2}. The designated priority vector of CP1 and CP2 port are
{A:4:C:0:C:CP1:CP2} and {A:4:C:0:C:CP2:CP2} separately. The port priority vector of
CP1 is better than its designated priority vector, but the root priority vector is not from
the root path priority vector of CP1 port. Therefore the role of CP1 is Alternate Port.
CP2 is still the root port.
5. Calculation Result
After the role of device and interface determines, the whole tree topology is
established completely. The flow forwarding path is shown as the Figure 8-2 after the
above calculation.

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