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

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show spanning-tree msti

View the multiple spanning tree instance.

Syntax
show spanning-tree msti [instance-number [brief]] [guard]
Parameters
instance-number
(Optional) Enter the multiple spanning tree instance number. The range is from 0 to 63.
brief
(Optional) Enter the keyword brief to view a synopsis of the MST instance.
guard
(Optional) Enter the keyword guard to display the type of guard enabled on an MSTP 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.
9.8(2.0)
Introduced on the S3100 series.
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
Support for the optional keyword guard was added 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) loopback BPDU inconsistency causes.
Usage Information
Enable the multiple spanning tree protocol prior to using this command.
Example
DellEMC# show spanning-tree msti 10
MSTI 10 VLANs mapped 101-105

Bridge Identifier has priority 32768, Address 0001.e802.3506
Configured hello time 2, max age 20, forward delay 15, max hops 5
Current root has priority 16384, Address 0001.e800.0a5c
Number of topology changes 0, last change occurred 3058087

Port 82 (TenGigabitEthernet 2/1) is designated Forwarding
Port path cost 0, Port priority 128, Port Identifier 128.82
Designated root has priority 16384, address 0001.e800.0a:5c
Designated bridge has priority 32768, address 0001.e802.35:06
Designated port id is 128.82, designated path cost
Number of transitions to forwarding state 1
BPDU (Mrecords): sent 1109, received 0
The port is not in the portfast mode

Port 88 (TenGigabitEthernet 2/6) is root Forwarding
Port path cost 0, Port priority 128, Port Identifier 128.88
Designated root has priority 16384, address 0001.e800.0a:5c
Designated bridge has priority 16384, address 0001.e800.0a:5c
Designated port id is 128.88, designated path cost
Number of transitions to forwarding state 4
BPDU (Mrecords): sent 19, received 1103
The port is not in the portfast mode

Port 89 (TenGigabitEthernet 2/7) is alternate Discarding
Port path cost 0, Port priority 128, Port Identifier 128.89
Designated root has priority 16384, address 0001.e800.0a:5c
Designated bridge has priority 16384, address 0001.e800.0a:5c
Designated port id is 128.89, designated path cost
Number of transitions to forwarding state 3
BPDU (Mrecords): sent 7, received 1103
The port is not in the portfast mode
Example (EDS and LBK)

The bold line shows the loopback BPDU inconsistency (LBK_INC).

DellEMC# show spanning-tree msti 0 brief
	MSTI 0 VLANs mapped 1-4094

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, max hops 20
Bridge ID Priority 32768, Address 0001.e801.6aa8
We are the root of MSTI 0 (CIST)
Configured hello time 2, max age 20, forward delay 15, max hops 20
CIST regional root ID Priority 32768, Address 0001.e801.6aa8
CIST external path cost 0

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 Boundary
----------------------------------------------------------
Te 1/1 ErrDis 128.257  128 20000 EDS 0   P2P       No   No

DellEMC# show spanning-tree msti 0
MSTI 0 VLANs mapped 1-4094

Root Identifier has priority 32768, Address 0001.e801.6aa8
Root Bridge hello time 2, max age 20, forward delay 15, max hops 20
Bridge Identifier has priority 32768, Address 0001.e801.6aa8
Configured hello time 2, max age 20, forward delay 15, max hops 20
We are the root of MSTI 0 (CIST)
Current root has priority 32768, Address 0001.e801.6aa8
CIST regional root ID Priority 32768, Address 0001.e801.6aa8
CIST external path cost 0
Number of topology changes 1, last change occured 00:00:15 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 (MRecords): sent 21, received 9
The port is not in the Edge port mode
Usage Information
The following describes the show spanning-tree msti 5 guard command shown in the following example.
Field
Description
Interface Name
MSTP interface.
Instance
MSTP instance.
Sts
Port state: root-inconsistent (INCON Root), forwarding (FWD), listening (LIS), blocking (BLK), or shut down (EDS Shut).
Guard Type
Type of STP guard configured (Root, Loop, or BPDU guard).
Example (Guard)
DellEMC# show spanning-tree msti 5 guard
Interface
Name    Instance  Sts Guard    type
------------------------------------
Te 1/1  5         INCON(Root)  Rootguard
Te 1/2  5         FWD          Loopguard
Te 1/3  5         EDS(Shut)    Bpduguard

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