Mstp Implementation Example - 3Com 7757 Configuration Manual

MSTP Implementation
Example
Network requirements
Implement MSTP in the network shown in Figure 66 to enable packets of different
VLANs to be forwarded along different spanning tree instances. The detailed
configurations are as follows:
All switches in the network belong to the same MST region.
■
Packets of VLAN 10, VLAN 30, VLAN 40, and VLAN 20 are forwarded along
■
spanning tree instance 1, instance 3, instance 4, and instance 0 respectively.
In this network, Switch A and Switch B operate on the distribution layer; Switch C
and Switch D operate on the access layer. VLAN 10 and VLAN 30 are limited in the
distribution layer and VLAN 40 is limited in the access layer. Switch A and Switch B
are configured as the root bridges of spanning tree instance 1 and spanning tree
instance 3 respectively. Switch C is configured as the root bridge of spanning tree
instance 4.
Network diagram
Figure 66 Network diagram for implementing MSTP
Switch A
Permit :
VLANs 10,20
Switch C
n
The "Permit:" shown in Figure 66 means the corresponding link permits packets of
specific VLANs.
Configuration procedure
1 Configure Switch A.
# Enter MST region view.
<SW7750> system-view
[SW7750] stp enable
[SW7750] stp region-configuration
# Configure the MST region.
[SW7750-mst-region] region-name example
[SW7750-mst-region] instance 1 vlan 10
[SW7750-mst-region] instance 3 vlan 30
[SW7750-mst-region] instance 4 vlan 40
[SW7750-mst-region] revision-level 0
# Activate the settings of the MST region.
[SW7750-mst-region] active region-configuration
Permit :all VLAN s
Permit : Permit :
VLANs 10,20 VLANs 20,30
Permit:VLAN s 20,40

MSTP Implementation Example

Switch B
Permit :
VLAN s 20,30
Switch D
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