Dell Command Line Reference Guide for the S4048–ON System 9.14.2.5

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show spanning-tree rstp

Display the RSTP configuration.

Syntax
show spanning-tree rstp [brief] [guard]
Parameters
brief
(OPTIONAL) Enter the keyword brief to view a synopsis of the RSTP configuration information.
guard
(OPTIONAL) Enter the keyword guard to display the type of guard enabled on an RSTP interface and the current port state.
Command Modes
  • EXEC
  • EXEC Privilege
Command History

This guide is platform-specific. For command information about other platforms, see the relevant Dell EMC Networking OS Command Line Reference Guide.

Version
Description
9.10(0.1)
Introduced on the S6010-ON and S4048T-ON.
9.10(0.0)
Introduced on the S3148.
9.10(0.0)
Introduced on the S6100-ON.
9.8(2.0)
Introduced on the S3100 series.
9.8(1.0)
Introduced on the Z9100-ON.
9.8(0.0P5)
Introduced on the S4048-ON.
9.8(0.0P2)
Introduced on the S3048-ON.
9.7(0.0)
Introduced on the S6000-ON.
9.2(1.0)
Introduced on the Z9500.
9.0.2.0
Introduced on the S6000.
8.3.19.0
Introduced on the S4820T.
8.3.11.1
Introduced on the Z9000.
8.4.2.1
Added support for the optional guard keyword on the C-Series, S-Series, and E-Series.
8.3.7.0
Introduced on the S4810.
7.6.1.0
Introduced on the S-Series.
7.5.1.0
Introduced on the C-Series.
6.4.1.0
Expanded to display the port error disable state (EDS) caused by loopback BPDU inconsistency.
6.2.1.1
Introduced on the E-Series.
Usage Information
The following describes the show spanning-tree rstp guard command shown in the following example.
Field
Description
Interface Name
RSTP interface.
Instance
RSTP instance.
Sts
Port state: root-inconsistent (INCON Root), forwarding (FWD), listening (LIS), blocking (BLK), disabled (DIS), or shut down (EDS Shut).
Guard Type
Types of STP guard configured (Root, Loop, or BPDU guard)
Example (Brief)
DellEMC# show spanning-tree rstp brief
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 8192, Address 0001.e805.e306
Root Bridge hello time 4, max age 20, forward delay 15
Bridge ID Priority 16384, Address 0001.e801.6aa8
Configured hello time 2, max age 20, forward delay 15
Interface                             Designated
Name   PortID Prio Cost Sts Cost      Bridge ID      PortID
---------- ------- --- ------- -------------------- --------
Te 4/2 128.418 128 20000 FWD 20000 16384 0001.e801.6aa8 128.418
Te 4/1 128.419 128 20000 FWD 20000 16384 0001.e801.6aa8 128.419
Te 4/8 128.426 128 20000 FWD 20000 8192 0001.e805.e306 128.130
Te 4/9 128.427 128 20000 BLK 20000 8192 0001.e805.e306 128.131

Interface
Name   Role PortID Prio Cost Sts Cost  Link-type Edge
----------- ---- ------- --- ------- --------- ----
Te 4/2 Desg 128.418 128 20000 FWD 20000 P2P     Yes
Te 4/1 Desg 128.419 128 20000 FWD 20000 P2P     Yes
Te 4/8 Root 128.426 128 20000 FWD 20000 P2P     No
Te 4/9 Altr 128.427 128 20000 BLK 20000 P2P     No
DellEMC#
Example (EDS, LBK)
NOTE: “LBK_INC” (bold) means Loopback BPDU Inconsistency.
DellEMC# show spanning-tree rstp br
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 32768, Address 0001.e801.6aa8
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 32768, Address 0001.e801.6aa8
We are the root
Configured hello time 2, max age 20, forward delay 15

Interface                           Designated
Name   PortID Prio Cost Sts Cost    Bridge ID PortID
- ---- ------- --- ------- -------------------- --------
Te 1/1 128.257 128 20000 EDS 0 32768 0001.e801.6aa8 128.257
Interface
Name   Role PortID    Prio Cost Sts Cost Link-type Edge
--- ------ -------- ---- ------- --- ------- --------- ----
Te 1/1 ErrDis 128.257 128 20000 EDS 0 P2P No

DellEMC# show spanning-tree rstp
Root Identifier has priority 32768, Address 0001.e801.6aa8
Root Bridge hello time 2, max age 20, forward delay 15, max hops 0
Bridge Identifier has priority 32768, Address 0001.e801.6aa8
Configured hello time 2, max age 20, forward delay 15, max hops 0
We are the root
Current root has priority 32768, Address 0001.e801.6aa8
Number of topology changes 1, last change occurred 00:00:31 ago on Te 1/1
Port 257 (TenGigabitEthernet 1/1) is LBK_INC Discarding
Port path cost 20000, Port priority 128, Port Identifier 128.257
Designated root has priority 32768, address 0001.e801.6aa8
Designated bridge has priority 32768, address 0001.e801.6aa8
Designated port id is 128.257, designated path cost 0
Number of transitions to forwarding state 1
BPDU : sent 27, received 9
The port is not in the Edge port mode
Example (Guard)
DellEMC# show spanning-tree rstp guard
Interface
Name   Instance Sts         Guard type
--------- -------- -------------------
Te 1/1 0        INCON(Root) Rootguard
Te 1/2 0        FWD         Loopguard
Te 1/3 0        BLK         Bpduguard

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