Mstp Configuration Example 2 - Lenovo CN4093 Application Manual

MSTP Configuration Example 2

1. Configure port membership and define the STGs for VLAN 1. Enable tagging on
uplink ports that share VLANs. Port 19 and port 20 connect to the Enterprise
Routing switches.
2. Configure MSTP: Spanning Tree mode, region name, and version.
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This configuration shows how to configure MSTP Groups on the switch, as shown
in Figure 15.
Figure 15. Implementing Multiple Spanning Tree Groups
Enterprise
Routing Switch
MSTP Group 1
Root
Passing VLAN 1
Blocking VLAN 2
Server 1
VLAN 1
This example shows how multiple Spanning Trees can provide redundancy
without wasting any uplink ports. In this example, the server ports are split
between two separate VLANs. Both VLANs belong to two different MSTP groups.
The Spanning Tree priority values are configured so that each routing switch is the
root for a different MSTP instance. All of the uplinks are active, with each uplink
port backing up the other.
CN 4093(config)# interface port 19,20
CN 4093(config-if)# switchport mode trunk
CN 4093(config-if)# exit
CN 4093(config)# spanning-tree mst configuration
CN 4093(config-mst)# name MyRegion
CN 4093(config-mst)# revision 100
CN 4093(config-mst)# exit
CN 4093(config)# spanning-tree mode mst
Blocking VLAN 1
Passing VLAN 2
Server 2 Server 3 Server 4
VLAN 1 VLAN 2 VLAN 2
(Define the Region name)
(Define the Revision level)
(Set mode to Multiple Spanning Trees)
Chapter 10: Spanning Tree Protocols
Enterprise
Routing Switch
MSTP Group 2
Root
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