102
Figure 29 MSTIs mapped to different VLANs
PVST configuration example
Network requirements
As shown in Figure 30:
• Device A and Device B work at the distribution layer. Device C and Device D work at the access
layer.
• Configure PVST so that packets of different VLANs are forwarded along different spanning trees.
• VLAN 10, VLAN 20, and VLAN 30 are terminated on the distribution layer devices, and VLAN 40
is terminated on the access layer devices. The root bridge of VLAN 10 and VLAN 20 is Device A,
that of VLAN 30 is Device B, and that of VLAN 40 is Device C.
Figure 30 Network diagram
A
B
A B
C D
C
B
C
MSTI 1 mapped to VLAN 10
A
D D
Root bridge Normal link Blocked link
MSTI 3 mapped to VLAN 30
MSTI 0 mapped to VLAN 20
MSTI 4 mapped to VLAN 40
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