Configure Pseudo Information Configuration Function of Spanning Tree

Configuration Condition

The parameters configured in pseudo information configuration mode take effect in MLAG environment.

Configure the root bridge priority of the specified spanning tree instance in the pseudo information.

Table 9-30 Configure the specified root bridge priority of the instance

Step	Command	Description
Enter the global configuration mode.	configure terminal	-
Configure entering the pseudo information	spanning-tree pseudo- information	Mandatory
Configure the root bridge priority of the specified spanning tree instance	mst instance [instance-id] root-priority [priority-value]	Mandatory By default, configure the root bridge priority of each spanning tree instance in the configuration pseudo information as 0 (the highest priority). instance-id: spanning tree instance ID, with a value range of 0 – 63. priority-value: configure the root bridge priority of the device in the specified spanning tree instance. The smaller the value, the higher the priority

The configuration step of root bridge priority value is 4096, which can be configured as: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, 61440.
On the MLAG paired device, the root bridge priorities of all instances configured in the pseudo information of the two devices must be consistent.

Configure the specified bridge priority of the spanning tree instance in the configuration pseudo information.

Table 9-31 Configure the specified bridge priority of the instance

Step	Command	Description
Enter the global configuration mode.	configure terminal	-
Configure entering the pseudo information	spanning-tree pseudo- information	Mandatory
Configure the specified bridge priority of the specified spanning tree instance in the pseudo information	mst instance instance-id designated-priority [priority-value]	Mandatory By default, configure the specified bridge priority for each spanning tree instance in the pseudo information as 32768. instance-id: The spanning tree instance ID, the value range is 0-63 priority-value: Configure the root bridge priority of the device in the specified spanning tree instance. The smaller the value, the higher the priority

The configuration step of the specified bridge priority value is 4096, which can be configured as: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, 61440.

Configure the root bridge priority of the device in the specified VLAN list.

Table 9-32 Configure the root bridge priority of the specified VLAN list

Step	Command	Description
Enter the global configuration mode.	configure terminal	-
Configure entering the pseudo information	spanning-tree pseudo- information	Mandatory
Configure the root bridge priority of the device in the specified VLAN list	vist vlan vlan-list root- priority [priority-value]	Mandatory By default, configure the root bridge priority of each VLAN in the pseudo information as 0 (the highest priority). priority-value: Configure the root bridge priority of the device in the specified spanning tree instance. The smaller the value, the higher the priority

The configuration step of root bridge priority value is 4096, which can be configured as: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, 61440.
On the MLAG paired device, the root bridge priorities of all VLANs configured in the pseudo information of the two devices must be consistent.

Configure the bridge priority of the device in the specified VLAN list.

Table 9-33 Configure the bridge priority of the specified VLAN list

Step	Command	Description
Enter the global configuration mode.	configure terminal	-
Configure entering the pseudo information	spanning-tree pseudo-information	Mandatory
Configure the bridge priority of the device in the specified VLAN list	vist vlan vlan-list designated-priority [priority-value]	Mandatory By default, configure the specified bridge priority of each spanning tree instance in the pseudo information as 32768. priority-value: Configure the root bridge priority of the device in the specified spanning tree instance. The smaller the value, the higher the priority

The configuration step of the specified bridge priority value is 4096, which can be configured as: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, 61440.