Configuring MSTP
15-28 Configuring Spanning Tree
Figure 15-14 Maximum Bandwidth in an MSTP Network Configuration
To configure the MSTP maximum bandwidth utilization example on all bridges:
• Create VLANs 10 and 20
set vlan create vlan-id
• Configure the MST configuration ID with the same name
set spantree mstcfgid cfgname name
• Create SIDs 86 and 99
set spantree msti sid sid create
• Create the FID to SID mappings VLAN 10 to SID 86 and VLAN 20 to SID 99
set spantree mstmap vlan-id sid sid
Additionally, the root of each SID is chosen to be in a different bridge. This will spread out the
traffic. The bridges on the next level down have a link to each of the root bridges.
To configure Bridge A as root for SID 86, set the priority to 4096 for SID 86.
set spantree priority priority sid
To configure Bridge B as the root for SID 99, set the priority to 4096 for SID 99.
Adjusting MSTP Parameters
You may need to adjust certain Spanning Tree parameters if the default values are not suitable for
your bridge configuration. Refer back to “Adjusting Spanning Tree Parameters” on page 15-20 and
“Adjusting RSTP Parameters” on page 15-23 for information on adjusting Spanning Tree defaults.
Changes made to global and port-related Spanning Tree defaults will take affect if the device is
running in STP, RSTP, or MSTP.
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Bridge A
SID 86 Priority = 4096
SID 99 Priority = 32768
Bridge B
Bridge C
Bridge D
SID 86 VLAN 10
SID 99 VLAN 20
Key:
SID 86 Priority = 32768
SID 99 Priority = 32768
SID 86 Priority = 32768
SID 99 Priority = 32768
SID 86 Priority = 32768
SID 99 Priority = 4096
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