3com 8807 사용자 가이드
152
C
HAPTER
17: MSTP R
EGION
-
CONFIGURATION
Typical MSTP
Configuration
Example
Configuration
Example
Network requirements
MSTP provides different forwarding paths for packets of different VLANs. The
configurations are as follows: all the switches in the network belong to the same
MST region, packets of VLAN 10 travels along instance 1, packets of VLAN 30
travels along instance 3, packets of VLAN 40 travels along instance 4, and that of
VLAN 20 travels along instance 0.
configurations are as follows: all the switches in the network belong to the same
MST region, packets of VLAN 10 travels along instance 1, packets of VLAN 30
travels along instance 3, packets of VLAN 40 travels along instance 4, and that of
VLAN 20 travels along instance 0.
In the following network diagram, Switch A and Switch B are devices of the
convergence layer, Switch C and Switch D are devices of the access layer. VLAN 10
and 30 function at the distribution and access layers, and VLAN 40 functions at
the access layer only. So the root of instance 1 can be configured as Switch A, root
of instance 3 can be Switch B, and root of instance 4 can be Switch C.
convergence layer, Switch C and Switch D are devices of the access layer. VLAN 10
and 30 function at the distribution and access layers, and VLAN 40 functions at
the access layer only. So the root of instance 1 can be configured as Switch A, root
of instance 3 can be Switch B, and root of instance 4 can be Switch C.
Network diagram
Figure 31 Network diagram for MSTP configuration
n
The explanations on the above figure which goes like "permit: XXXX" means that
packets of these VLANs are permitted to pass.
packets of these VLANs are permitted to pass.
Enable debugging of the state machine
for port state transition
for port state transition
undo debugging stp state-machine pst
Enable debugging of the topology
change state machine
change state machine
debugging stp state-machine tcm
Disable debugging of the topology
change state machine
change state machine
undo debugging stp state-machine tcm
Enable debugging of the state machine
for port protocol transition
for port protocol transition
debugging stp state-machine ppm
Disable debugging of the state machine
for port protocol transition
for port protocol transition
undo debugging stp state-machine ppm
Enable debugging of the port transport
state machine
state machine
debugging stp state-machine ptx
Disable debugging of the port transport
state machine
state machine
undo debugging stp state-machine ptx
Enable debugging of the state machine
for topology change protection
for topology change protection
debugging stp state-machine tcpm
Disable debugging of the state machine
for topology change protection
for topology change protection
undo debugging stp state-machine tcpm
Table 136 Display and debug MSTP
Operation Command
Switch A
Switch C
Switch B
Switch D
Permit :
VLAN 10, 20
VLAN 10, 20
Permit :
VLAN 10, 20
VLAN 10, 20
Permit :
VLAN 20, 30
VLAN 20, 30
Permit :
VLAN 20, 30
VLAN 20, 30
Permit :all VLAN
Permit :VLAN 20, 40
Switch A
Switch C
Switch B
Switch D
Permit :
VLAN 10, 20
VLAN 10, 20
Permit :
VLAN 10, 20
VLAN 10, 20
Permit :
VLAN 20, 30
VLAN 20, 30
Permit :
VLAN 20, 30
VLAN 20, 30
Permit :all VLAN
Permit :VLAN 20, 40