Users Guide

ethernet1/1/27 128.216 128 500 BLK 0 32769 3417.ec37.1400 128.56
ethernet1/1/28 128.224 128 500 BLK 0 32769 3417.ec37.1400 128.64
Interface
Name Role PortID Prio Cost Sts Cost Link-type
Edge
-----------------------------------------------------------------------------------------
----
ethernet1/1/5 Altr 128.40 128 500 BLK 500 AUTO
No
ethernet1/1/6 Altr 128.48 128 500 BLK 500 AUTO
No
ethernet1/1/7 Desg 128.56 128 500 FWD 500 AUTO
No
ethernet1/1/8 Altr 128.64 128 500 BLK 500 AUTO
No
ethernet1/1/9 Altr 128.72 128 500 BLK 500 AUTO
No
ethernet1/1/10 Altr 128.80 128 500 BLK 500 AUTO
No
ethernet1/1/25 Desg 128.200 128 500 FWD 500 AUTO
No
ethernet1/1/26 Root 128.208 128 500 FWD 0 AUTO
No
ethernet1/1/27 Altr 128.216 128 500 BLK 0 AUTO
No
ethernet1/1/28 Altr 128.224 128 500 BLK 0 AUTO
No
Select the root bridge
Rapid-PVST determines the root bridge by the VLAN bridge priority. Assign one bridge a lower priority to increase the likelihood
that it becomes the root bridge. The show spanning-tree brief command displays information about all ports regardless
of the operational status.
● Assign a number as the bridge priority or designate it as the root in CONFIGURATION mode, from 0 to 61440.
spanning-tree {vlan vlan-id priority priority-value}
○ vlan-id — Enter a value between 1 to 4093.
○ priority priority-value — Enter the priority value in increments of 4096, default is 32768. The lower the
number assigned, the more likely this bridge becomes the root bridge. The bridge priority the valid values are: 0, 4096,
8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, or 61440. All other values
are rejected.
Configure root bridge
OS10(config)# spanning-tree vlan 1 priority 4096
View active configuration
OS10(config)# do show spanning-tree active
Spanning tree enabled protocol rapid-pvst with force-version rstp
VLAN 1
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 4097, Address 90b1.1cf4.a523
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 4097, Address 90b1.1cf4.a523
We are the root of VLAN 1
Configured hello time 2, max age 20, forward delay 15
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
---------------------------------------------------------------------
ethernet1/1/5 128.276 128 500 FWD 0 4097 90b1.1cf4.a523 128.276
ethernet1/1/6 128.280 128 500 FWD 0 4097 90b1.1cf4.a523 128.280
Interface
Name Role PortID Prio Cost Sts Cost Link-type Edge
--------------------------------------------------------------
Layer 2
611