Dell Configuration Guide for the S4048–ON System 9.14.2.6

Examples of the RSTP show Commands

To verify that RSTP is enabled, use the show config command from PROTOCOL SPANNING TREE RSTP mode. The bold line indicates that RSTP is enabled.

DellEMC(conf-rstp)#show config
!
protocol spanning-tree rstp
no disable
DellEMC(conf-rstp)#

To view the interfaces participating in RSTP, use the show spanning-tree rstp command from EXEC privilege mode. If a physical interface is part of a port channel, only the port channel is listed in the command output.

DellEMC#show spanning-tree rstp
Root Identifier has priority 32768, Address 0001.e801.cbb4
Root Bridge hello time 2, max age 20, forward delay 15, max hops 0
Bridge Identifier has priority 32768, Address 0001.e801.cbb4
Configured hello time 2, max age 20, forward delay 15, max hops 0
We are the root
Current root has priority 32768, Address 0001.e801.cbb4
Number of topology changes 4, last change occurred 00:02:17 ago on Te 1/26

Port 377 (TenGigabitEthernet 2/1) is designated Forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.377
Designated root has priority 32768, address 0001.e801.cbb4
Designated bridge has priority 32768, address 0001.e801.cbb4
Designated port id is 128.377, designated path cost 0
Number of transitions to forwarding state 1
BPDU : sent 121, received 9
The port is not in the Edge port mode

Port 378 (TenGigabitEthernet 2/2) is designated Forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.378
Designated root has priority 32768, address 0001.e801.cbb4
Designated bridge has priority 32768, address 0001.e801.cbb4
Designated port id is 128.378, designated path cost 0
Number of transitions to forwarding state 1
BPDU : sent 121, received 2
The port is not in the Edge port mode

Port 379 (TenGigabitEthernet 2/3) is designated Forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.379
Designated root has priority 32768, address 0001.e801.cbb4
Designated bridge has priority 32768, address 0001.e801.cbb4
Designated port id is 128.379, designated path cost 0
Number of transitions to forwarding state 1
BPDU : sent 121, received 5
The port is not in the Edge port mode

Port 380 (TenGigabitEthernet 2/4) is designated Forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.380
Designated root has priority 32768, address 0001.e801.cbb4
Designated bridge has priority 32768, address 0001.e801.cbb4
Designated port id is 128.380, designated path cost 0

Number of transitions to forwarding state 1
BPDU : sent 147, received 3
The port is not in the Edge port mode

To confirm that a port is participating in RSTP, use the show spanning-tree rstp brief command from EXEC privilege mode.

R3#show spanning-tree rstp brief
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 32768, Address 0001.e801.cbb4
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 32768, Address 0001.e80f.1dad
Configured hello time 2, max age 20, forward delay 15
Interface                             Designated
Name    PortID  Prio Cost   Sts Cost  Bridge ID             PortID
---------- -------- ----   ------- --- ------- ------------- --------
Te 3/1  128.681 128  20000  BLK 20000 32768 0001.e80b.88bd  128.469
Te 3/2  128.682 128  20000  BLK 20000 32768 0001.e80b.88bd  128.470
Te 3/3  128.683 128  20000  FWD 20000 32768 0001.e801.cbb4  128.379
Te 3/4  128.684 128  20000  BLK 20000 32768 0001.e801.cbb4  128.380
Interface
Name    Role  PortID  Prio Cost  Sts Cost   Link-type Edge
------- --- ------ -------- ---- ------- --- -----------
Te 3/1  Altr  128.681 128 20000  BLK 20000  P2P       No
Te 3/2  Altr  128.682 128 20000  BLK 20000  P2P       No
Te 3/3  Root  128.683 128 20000  FWD 20000  P2P       No
Te 3/4  Altr  128.684 128 20000  BLK 20000  P2P       No
R3#