Users Guide

ethernet1/1/9 Disb 128.72 128 200000000 BLK 0
AUTO No
ethernet1/1/10 Disb 128.80 128 200000000 BLK 0
AUTO No
ethernet1/1/11 Disb 128.88 128 200000000 BLK 0
AUTO No
ethernet1/1/12 Disb 128.96 128 200000000 BLK 0
AUTO No
ethernet1/1/13 Disb 128.104 128 200000000 BLK 0
AUTO No
ethernet1/1/14 Disb 128.112 128 200000000 BLK 0
AUTO No
ethernet1/1/15 Disb 128.120 128 200000000 BLK 0
AUTO No
ethernet1/1/16 Disb 128.128 128 200000000 BLK 0
AUTO No
ethernet1/1/17 Disb 128.136 128 200000000 BLK 0
AUTO No
ethernet1/1/18 Disb 128.144 128 200000000 BLK 0
AUTO No
ethernet1/1/19 Disb 128.152 128 200000000 BLK 0
AUTO No
ethernet1/1/20 Disb 128.160 128 200000000 BLK 0
AUTO No
ethernet1/1/21 Disb 128.168 128 200000000 BLK 0
AUTO No
ethernet1/1/22 Disb 128.176 128 200000000 BLK 0
AUTO No
ethernet1/1/23 Disb 128.184 128 200000000 BLK 0
AUTO No
ethernet1/1/24 Disb 128.192 128 200000000 BLK 0
AUTO No
ethernet1/1/25 Disb 128.200 128 200000000 BLK 0
AUTO No
ethernet1/1/26 Disb 128.208 128 200000000 BLK 0
AUTO No
ethernet1/1/27 Disb 128.216 128 200000000 BLK 0
AUTO No
ethernet1/1/28 Disb 128.224 128 200000000 BLK 0
AUTO No
ethernet1/1/29 Disb 128.232 128 200000000 BLK 0
AUTO No
ethernet1/1/30 Disb 128.240 128 200000000 BLK 0
AUTO No
ethernet1/1/31 Disb 128.248 128 200000000 BLK 0
AUTO No
ethernet1/1/32 Disb 128.256 128 200000000 BLK 0
AUTO No
Root selection
MSTP determines the root bridge according to the lowest bridge ID. To increase the likelihood of a bridge to be selected as a
root bridge, assign a lower bridge priority numerical value to that bridge.
You can set the priority value to 0 to force a switch to become the root switch. Value 0 is the highest priority.
● Assign a bridge priority number to a specific instance in CONFIGURATION mode, from 0 to 61440 in increments of 4096,
default 32768.
spanning-tree mst instance-number priority priority
Assign root bridge priority
OS10(config)# spanning-tree mst 0 priority 32768
Verify root bridge priority
OS10# show spanning-tree active
Spanning tree enabled protocol msti with force-version mst
MSTI 0 VLANs mapped 1,31-4093
Layer 2
631