Reference Guide
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
ethernet1/1/7 128.284 128 200000000 FWD 0 32769 0000.0000.0000 128.284
ethernet1/1/8 128.288 128 200000000 FWD 0 32769 0000.0000.0000 128.288
ethernet1/1/9 128.292 128 200000000 FWD 0 32769 0000.0000.0000 128.292
ethernet1/1/10 128.296 128 200000000 FWD 0 32769 0000.0000.0000 128.296
ethernet1/1/11 128.300 128 200000000 FWD 0 32769 0000.0000.0000 128.300
ethernet1/1/12 128.304 128 200000000 FWD 0 32769 0000.0000.0000 128.304
ethernet1/1/13 128.308 128 200000000 FWD 0 32769 0000.0000.0000 128.308
ethernet1/1/14 128.312 128 200000000 FWD 0 32769 0000.0000.0000 128.312
ethernet1/1/15 128.316 128 200000000 FWD 0 32769 0000.0000.0000 128.316
ethernet1/1/16 128.320 128 200000000 FWD 0 32769 0000.0000.0000 128.320
ethernet1/1/17 128.324 128 200000000 FWD 0 32769 0000.0000.0000 128.324
ethernet1/1/18 128.328 128 200000000 FWD 0 32769 0000.0000.0000 128.328
ethernet1/1/19 128.332 128 200000000 FWD 0 32769 0000.0000.0000 128.332
ethernet1/1/20 128.336 128 200000000 FWD 0 32769 0000.0000.0000 128.336
ethernet1/1/21 128.340 128 200000000 FWD 0 32769 0000.0000.0000 128.340
ethernet1/1/22 128.344 128 200000000 FWD 0 32769 0000.0000.0000 128.344
ethernet1/1/23 128.348 128 200000000 FWD 0 32769 0000.0000.0000 128.348
ethernet1/1/24 128.352 128 200000000 FWD 0 32769 0000.0000.0000 128.352
ethernet1/1/25 128.356 128 200000000 FWD 0 32769 0000.0000.0000 128.356
ethernet1/1/26 128.360 128 200000000 FWD 0 32769 0000.0000.0000 128.360
ethernet1/1/27 128.364 128 200000000 FWD 0 32769 0000.0000.0000 128.364
ethernet1/1/28 128.368 128 200000000 FWD 0 32769 0000.0000.0000 128.368
ethernet1/1/29 128.372 128 200000000 FWD 0 32769 0000.0000.0000 128.372
ethernet1/1/30 128.376 128 200000000 FWD 0 32769 0000.0000.0000 128.376
ethernet1/1/31 128.380 128 200000000 FWD 0 32769 0000.0000.0000 128.380
ethernet1/1/32 128.384 128 200000000 FWD 0 32769 0000.0000.0000 128.384
Interface
Name Role PortID Prio Cost Sts Cost Link-type Edge
-----------------------------------------------------------------------
ethernet1/1/1 Disb 128.260 128 200000000 FWD 0 AUTO No
ethernet1/1/2 Disb 128.264 128 200000000 FWD 0 AUTO No
ethernet1/1/3 Disb 128.268 128 200000000 FWD 0 AUTO No
ethernet1/1/4 Disb 128.272 128 200000000 FWD 0 AUTO No
ethernet1/1/5 Desg 128.276 128 500 FWD 0 AUTO No
ethernet1/1/6 Desg 128.280 128 500 FWD 0 AUTO No
ethernet1/1/7 Disb 128.284 128 200000000 FWD 0 AUTO No
ethernet1/1/8 Disb 128.288 128 200000000 FWD 0 AUTO No
ethernet1/1/9 Disb 128.292 128 200000000 FWD 0 AUTO No
ethernet1/1/10 Disb 128.296 128 200000000 FWD 0 AUTO No
ethernet1/1/11 Disb 128.300 128 200000000 FWD 0 AUTO No
Root assignment
RPVST+ assigns the root bridge according to the lowest bridge ID. Assign one bridge as root bridge and the other as a secondary root
bridge.
• Congure the device as the root or secondary root in CONFIGURATION mode.
spanning-tree vlan vlan-id root {primary | secondary}
– vlan-id — Enter the VLAN ID number (1 to 4093).
– primary — Enter the bridge as primary or root bridge (primary bridge value is 24576).
– secondary — Enter the bridge as secondary or secondary root bridge (secondary bridge value is 28672).
Congure root bridge as primary
OS10(config)# spanning-tree vlan 1 root primary
Verify root bridge information
OS10# show spanning-tree active
Spanning tree enabled protocol rapid-pvst with force-version rstp
VLAN 1
216
Layer 2