Configuring Multiple Stgs - Lenovo CN4093 Application Manual

Configuring Multiple STGs

1. Set the Spanning Tree mode on each switch to PVRST.
2. Configure the following on Switch A:
3. Configure the following on Switch B:
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This configuration shows how to configure the three instances of STGs on the
switches A, B, C and D illustrated in
Because VASA is enabled by default, each new VLAN is automatically assigned its
own STG. However, for this configuration example, some VLANs are explicitly
reassigned to other STGs.
CN 4093(config)# spanning-tree mode pvrst
Note: PVRST is the default mode on the CN4093. This step is not required unless
the STP mode has been previously changed, and is shown here merely as an
example of manual configuration.
a. Enable VLAN 2 and VLAN 3.
CN 4093(config)# vlan 2
CN 4093(config-vlan)# exit
CN 4093(config)# vlan 3
CN 4093(config-vlan)# exit
If VASA is disabled, enter the following commands:
CN 4093(config)# spanning-tree stp 2 vlan 2
CN 4093(config)# spanning-tree stp 3 vlan 3
b. Add port 17 to VLAN 2 and port 18 to VLAN 3.
CN 4093(config)# interface port 17
CN 4093(config-if)# switchport access vlan 2
CN 4093(config-if)# exit
CN 4093(config)# interface port 18
CN 4093(config-if)# switchport access vlan 3
CN 4093(config-if)# exit
VLAN 2 and VLAN 3 are removed from STG 1.
Note: In PVRST mode, each instance of STG is enabled by default.
Add port 8 to VLAN 2. Ports 1 and 2 are by default in VLAN 1 assigned to STG 1.
CN 4093(config)# vlan 2
CN 4093(config-vlan)# stg 2
CN 4093(config-vlan)# exit
CN 4093(config)# interface port 8
CN 4093(config-if)# switchport mode trunk
CN 4093(config-if)# exit
If VASA is disabled, enter the following command:
CN 4093(config)# spanning-tree stp 2 vlan 2
Figure 14 on page 162.
Chapter 10: Spanning Tree Protocols
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