Configuring MSTP
(MST bridge 1,1, MST Bridge 9,0, MST Bridge 9, s), then the port 7 MST bridge then u and t
CIST priority vector, we found that the port u better information , so the election for the Region
3 8 MST bridge the CIST regional root bridge, MST bridge 7, u is the CIST root port the port.
Assuming MST Bridge 7 CIST internal root path cost is 1, then the information will update t
port (MST bridge 1,1, MST Bridge 8,1, MST bridge 7, t).
Bridge 8 port w MST received the CIST bridge priority vector 9 (MST Bridge 1,1, MST
Bridge 9,0, MST Bridge 9, r), with its own port w (MST Bridge 1,1, MST Bridge 8 , 0, MST
bridge 8, w) compared to find themselves better, do not update the port information of w;
Similarly, port v of the information received MST bridge over the CIST priority vector 7 (MST
Bridge 7,0, MST Bridge 7,0, MST bridge 7, u) better, do not update the port v information.
Then MST bridge 8 port w and v for CIST priority vector comparison, the election for the
Region 3 MST bridge 8 the CIST regional root bridge.
MST Bridge Port 9 r received MST CIST bridge 8 priority vector (MST Bridge 1,1, MST
Bridge 8,0, MST bridge 8, w), r with the port itself (MST Bridge 1,1, MST Bridge 9 , 0, MST
Bridge 9, r) compared to that of MST Bridge 8 better, it will update the port information of r
(MST bridge 1,1, MST Bridge 8,0, MST bridge 8, w); port s information than the MST received
the CIST bridge priority vector 7 (MST Bridge 7,0, MST Bridge 7,0, MST bridge 7, u) better, do
not update the port s of information. Then MST Bridge 9 r and s, with CIST port priority vector
comparison, the election for the Region 3 MST bridge 8 the CIST regional root bridge, MST
Bridge 9 port r is the CIST root port. Assuming MST Bridge 9 CIST internal root path cost is 1,
then the information will be updated to the port s (MST bridge 1,1, MST Bridge 8,1, MST
Bridge 9, s).
Similarly, MST bridge 3 was selected as the CIST regional root Region 2 bridge, MST
bridge 4 port i is the CIST root port, MST Bridge 5 port k is the CIST root port, MST Bridge 6 o
is the CIST root port the port.
As the MST CIST root bridge 1 bridge, so bridge a MST Region 1 is the CIST regional root
bridge, MST bridge port 2 c is the CIST root port.
3. All elections within the specified bridge IST, CIST specified port
CIST regional root bridge elected after the Region 3, for example:
MST CIST regional root bridge 8 for the bridge, the port w and v are specified port port is the
LAN I, J of the designated bridge.
MST Bridge 9 s in the port receiving the message priority vector (MST Bridge 1,1, MST
Bridge 8,1, MST bridge 7, t) 9 own bridge than the MST port priority vector (MST Bridge 1,1,
MST Bridge 8,1, MST Bridge 9, s) excellent, that is to receive the CIST root bridge, CIST
external root path cost, CIST regional root bridge and the CIST internal root path costs are
equal, but CIST logo smaller than their designated bridge, so choose MST bridges to LAN 7 H,
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