Typical Mstp Configuration Example - 3Com 8807 Configuration Manual

152 C 17: MSTP R
HAPTER
Typical MSTP
Configuration
Example
-
EGION CONFIGURATION
Table 136 Display and debug MSTP
Operation
Enable debugging of the state machine
for port state transition
Enable debugging of the topology
change state machine
Disable debugging of the topology
change state machine
Enable debugging of the state machine
for port protocol transition
Disable debugging of the state machine
for port protocol transition
Enable debugging of the port transport
state machine
Disable debugging of the port transport
state machine
Enable debugging of the state machine
for topology change protection
Disable debugging of the state machine
for topology change protection
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.
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.
Network diagram
Figure 31 Network diagram for MSTP configuration
Switch A Switch A
Permit : Permit :
VLAN 10, 20 VLAN 10, 20
Switch C Switch C
n
The explanations on the above figure which goes like "permit: XXXX" means that
packets of these VLANs are permitted to pass.
Command
undo debugging stp state-machine pst
debugging stp state-machine tcm
undo debugging stp state-machine tcm
debugging stp state-machine ppm
undo debugging stp state-machine ppm
debugging stp state-machine ptx
undo debugging stp state-machine ptx
debugging stp state-machine tcpm
undo debugging stp state-machine tcpm
Permit :all VLAN Permit :all VLAN
Permit : Permit :
Permit : Permit :
VLAN 10, 20 VLAN 10, 20
VLAN 20, 30 VLAN 20, 30
Permit :VLAN 20, 40 Permit :VLAN 20, 40
Switch B Switch B
Permit : Permit :
VLAN 20, 30 VLAN 20, 30
Switch D Switch D