Configuring MSTP
CIST designated bridge, MST bridge 7 of the CIST port t becomes the designated port, MST
Bridge 9 port s port on the replacement, is set to the Discarding state. Similarly, MST Bridge 2
port d to specify the port, MST Bridge 2 is the designated bridge of G LAN, MST Bridge Port 9
q is replaced by the port, is set to the Discarding state.
Similarly, in Region 2 in, MST bridge 4 port j for the CIST port specified, MST bridge 4 on
the designated bridge for LAN D; MST Bridge 6, n is the CIST port specify a port, MST bridge
on the LAN E, 6 designated bridge.
In Region 1 in, MST CIST regional root bridge 1 bridge, so the port a and port b is the
designated port is the LAN A designated bridge; MST Bridge 2 port e to the specified port,
MST bridge B is designated for the LAN 2 bridge.
23.3.4.2 Determining MSTI Priority Vectors
MSTI elections and the electoral process similar to the single spanning tree, MSTI priority
vector is used to compare the election.
Figure 23-10
To Region 3 as an example MSTI1 formation, as shown in Figure 23-10:
Assuming the bridge priority：MST bridge 9< MST bridge 8< MST bridge 7，The path cost
of all ports is 1.
1. MSTP domain root bridge election
MST Bridge 7 Bridge highest priority, was selected MSTI regional root bridge.
2. Election of the non-root bridge MSTI root port
MST Bridge 8: Select the port v is the MSTI root port, MSTI internal root path cost is 1.
MST Bridge 9: Select the port s is the MSTI root port, MSTI internal root path cost is 1.
3. Election of the designated bridge of the MSTI port
MST Bridge 7: H was selected as the designated regional networks and bridges, ports, u
and t as specified MSTI port。
MST Bridge 8: J was selected as the designated bridge the LAN port w is specified MSTI
port; port x is Region 3 and the upstream communications port, and is designated as the main
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