Qtech QSW-2800v2 Руководство пользователя онлайн [189/230] 481607

Qtech QSW-2800v2 Руководство пользователя онлайн [189/230] 481607
Chapter8 Reliability Configuration
8-7
priority vector of PB port is { RD : ERCD+
PCPB : B : 0 : D : PD : PB }.
If the port priority vector is from the bridge of the same domain, the inner
path cost of the root path priority vector is the sum of the inner root path cost
of the port priority vector and the port path cost. The root path priority vector
of PB port after calculation is { RD : ERCD: RRD : IRCD +
PCPB : D : PD : PB }.
(4) Bridge Priority Vector
The total root ID, domain root ID and designated bridge ID of bridge priority vector
are all the local bridge ID. The outer root path cost and inner root path cost are all
zero. The designated port ID and the receiving port ID are all zero. The bridge
priority vector of bridge B is { B : 0 : B : 0 : B : 0 : 0 }.
(5) Root Priority Vector
The root priority vector is the better value between the bridge priority vector and
the root path priority vector of all the designated bridge ID different with the local
bridge ID. If the local bridge priority vector is better, then the local bridge is the
CIST total root. Supposing that the bridge priority vector of bridge B is the best,
then the root priority vector of bridge B is { B : 0 : B : 0 : B : 0 : 0 }.
(6) Designated Priority Vector
The designated priority vector of port is calculated from the root priority vector.
The designated bridge ID of the root priority vector is replaced to be the local
bridge ID and the designated port ID is replaced to be its own port ID. The
designated priority vector of PB port of bridge B is
{ B : 0 : B : 0 : B : PB : 0 }.
b) MSTI Priority Vector Calculation
The calculation rule of each MSTI priority vector is basically the same as the
CIST priority vector. There are two differences.
There are not the total root and outer root path cost in MSTI priority vector. It
is only composed of domain root, inner root path cost, designated bridge ID,
designated port ID and the ID of port receiving BPDU message.
MSTI only handles the message priority vector from the same domain.

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