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show spanning-tree interface

Syntax

<brief | detail>
show spanning-tree interface
<msti msti-id>
<routing-instance routing-instance-name>
<vlan-id vlan-id>

Release Information

Command introduced in JUNOS Release 8.4.

Description

Display the configured or calculated interface-level STP parameters.

Options

none — Display brief STP interface information.

brief | detail — (Optional) Display the specified level of output.

msti msti-id — (Optional) Display STP interface information for the specified MST instance.

routing-instance routing-instance-name — (Optional) Display STP interface information for the specified routing instance.

vlan-id vlan-id — (Optional) Display STP interface information for the specified VLAN.

Required Privilege Level

view

List of Sample Output

show spanning-tree interface
show spanning-tree interface detail
show spanning-tree interface msti
show spanning-tree interface vlan-id 101
show spanning-tree interface (VSTP)
show spanning-tree interface vlan-id (VSTP)

Output Fields

Table 172 lists the output fields for the show spanning-tree Interface command. Output fields are listed in the approximate order in which they appear.

Table 172: show spanning-tree Interface Output Fields

Field Name

Field Description

Interface name

Interface configured to participate in the STP, RSTP, VSTP, or MSTP instance.

Port ID

Logical interface identifier configured to participate in the MSTP or VSTP instance.

Designated port ID

Port ID of the designated port for the LAN segment to which this interface is attached.

Designated bridge ID

Bridge ID of the designated bridge for the LAN segment to which this interface is attached.

Port Cost

Configured cost for the interface.

Port State

STP port state. Forwarding (FWD), blocking (BLK), listening, learning, or disabled.

Port Role

MSTP, VSTP, or RSTP port role. Designated (DESG), backup (BKUP), alternate (ALT), root, or Root Prevented (Root-Prev).

Link type

MSTP, VSTP, or RSTP link type. Shared or point-to-point (pt-pt) and edge or nonedge.

Alternate

Identifies the interface as an MSTP, VSTP, or RSTP alternate root port (yes) or nonalternate root port (no).

Boundary Port

Identifies the interface as an MSTP regional boundary port (yes) or nonboundary port (no).

Sample Output

show spanning-tree interface

user@host> show spanning-tree interface routing-instance vs1 detail 
Spanning tree interface parameters for instance 0

Interface    Port ID    Designated      Designated         Port    State  Role
                         port ID        bridge ID          Cost
ae1              128:1        128:1  32768.0090690b47d1      1000  FWD    DESG
ge-2/1/2         128:2        128:2  32768.0090690b47d1     20000  FWD    DESG
ge-2/1/5         128:3        128:3  32768.0090690b47d1     29999  FWD    DESG
ge-2/2/1         128:4       128:26  32768.0013c39ec880     20000  FWD    ROOT
xe-9/2/0         128:5        128:5  32768.0090690b47d1      2000  FWD    DESG
xe-9/3/0         128:6        128:6  32768.0090690b47d1      2000  FWD    DESG

Spanning tree interface parameters for instance 1

Interface    Port ID    Designated      Designated         Port    State  Role
                         port ID        bridge ID          Cost
ae1              128:1        128:1  32769.0090690b47d1      1000  FWD    DESG
ge-2/1/2         128:2        128:2  32769.0090690b47d1     20000  FWD    DESG
ge-2/1/5         128:3        128:3  32769.0090690b47d1     29999  FWD    DESG
ge-2/2/1         128:4       128:26  32769.0013c39ec880     20000  FWD    ROOT
xe-9/2/0         128:5        128:5  32769.0090690b47d1      2000  FWD    DESG
xe-9/3/0         128:6        128:6  32769.0090690b47d1      2000  FWD    DESG

Spanning tree interface parameters for instance 2

Interface    Port ID    Designated      Designated         Port    State  Role
                         port ID        bridge ID          Cost
ae1              128:1        128:1  32770.0090690b47d1      1000  FWD    DESG
ge-2/1/2         128:2        128:2  32770.0090690b47d1     20000  FWD    DESG
ge-2/1/5         128:3        128:3  32770.0090690b47d1     29999  FWD    DESG
ge-2/2/1         128:4       128:26  32770.0013c39ec880     20000  FWD    ROOT
xe-9/2/0         128:5        128:5  32770.0090690b47d1      2000  FWD    DESG
xe-9/3/0         128:6        128:6  32770.0090690b47d1      2000  FWD    DESG

show spanning-tree interface detail

user@host> show spanning-tree interface routing-instance vs1 detail 
Spanning tree interface parameters for instance 0

Interface name                 : ae1
Port identifier                : 128.1
Designated port ID             : 128.1
Port cost                      : 1000
Port state                     : Forwarding
Designated bridge ID           : 32768.00:90:69:0b:47:d1
Port role                      : Designated
Link type                      : Pt-Pt/NONEDGE
Boundary port                   : No

Interface name                 : ge-2/1/2
Port identifier                : 128.2
Designated port ID             : 128.2
Port cost                      : 20000
Port state                     : Forwarding
Designated bridge ID           : 32768.00:90:69:0b:47:d1
Port role                      : Designated
Link type                      : Pt-Pt/NONEDGE
Boundary port                   : No

Interface name                 : ge-2/1/5
Port identifier                : 128.3
Designated port ID             : 128.3
Port cost                      : 29999
Port state                     : Forwarding
Designated bridge ID           : 32768.00:90:69:0b:47:d1
Port role                      : Designated
Link type                      : Pt-Pt/NONEDGE
Boundary port                   : No

Interface name                 : ge-2/2/1
Port identifier                : 128.4
Designated port ID             : 128.26
Port cost                      : 20000
Port state                     : Forwarding
Designated bridge ID           : 32768.00:13:c3:9e:c8:80
Port role                      : Root
Link type                      : Pt-Pt/NONEDGE
Boundary port                   : No

Interface name                 : xe-9/2/0
Port identifier                : 128.5
Designated port ID             : 128.5
Port cost                      : 2000
Port state                     : Forwarding
Designated bridge ID           : 32768.00:90:69:0b:47:d1
Port role                      : Designated
Link type                      : Pt-Pt/NONEDGE
Boundary port                   : No

Interface name                 : xe-9/3/0
Port identifier                : 128.6
Designated port ID             : 128.6
Port cost                      : 2000
Port state                     : Forwarding
Designated bridge ID           : 32768.00:90:69:0b:47:d1
Port role                      : Designated
Link type                      : Pt-Pt/NONEDGE
Boundary port                   : No


Spanning tree interface parameters for instance 1

Interface name                 : ae1
Port identifier                : 128.1
Designated port ID             : 128.1
Port cost                      : 1000
Port state                     : Forwarding
Designated bridge ID           : 32768.00:90:69:0b:47:d1
Port role                      : Designated
Link type                      : Pt-Pt/NONEDGE
Boundary port                   : No

Interface name                 : ge-2/1/2
Port identifier                : 128.2
Designated port ID             : 128.2
Port cost                      : 20000
Port state                     : Forwarding
Designated bridge ID           : 32768.00:90:69:0b:47:d1
Port role                      : Designated
Link type                      : Pt-Pt/NONEDGE
Boundary port                   : No

Interface name                 : ge-2/1/5
Port identifier                : 128.3
Designated port ID             : 128.3
Port cost                      : 29999
Port state                     : Forwarding
Designated bridge ID           : 32768.00:90:69:0b:47:d1
Port role                      : Designated
Link type                      : Pt-Pt/NONEDGE
Boundary port                   : No

Interface name                 : ge-2/2/1
Port identifier                : 128.4
Designated port ID             : 128.26
Port cost                      : 20000
Port state                     : Forwarding
Designated bridge ID           : 32768.00:13:c3:9e:c8:80
Port role                      : Root
Link type                      : Pt-Pt/NONEDGE
Boundary port                   : No

...

show spanning-tree interface msti

user@host> show spanning-tree interface msti 1 routing-instance vs1 detail 
 Spanning tree interface parameters for instance 1

Interface    Port ID    Designated      Designated         Port    State  Role
                         port ID        bridge ID          Cost
xe-7/0/0         128:1        128:1  32769.0090690b4fd1      2000  FWD    DESG
ge-5/1/0         128:2        128:2  32769.0090690b4fd1     20000  FWD    DESG
ge-5/1/1         128:3        128:3  32769.0090690b4fd1     20000  FWD    DESG
ae1              128:4        128:1  32769.0090690b47d1     10000  BLK    ALT
ge-5/1/4         128:5        128:3  32769.0090690b47d1     20000  BLK    ALT
xe-7/2/0         128:6        128:6  32769.0090690b47d1      2000  FWD    ROOT

show spanning-tree interface vlan-id 101

user@host> show spanning-tree interface vlan-id 101 routing-instance vs1 detail 
Spanning tree interface parameters for instance 0

Interface    Port ID    Designated      Designated         Port    State  Role
                         port ID        bridge ID          Cost
ge-11/0/5        128:1        128:1  32768.0090690b7fd1     20000  FWD    DESG
ge-11/0/6        128:2        128:1  32768.0090690b7fd1     20000  BLK    BKUP
ge-11/1/0        128:3        128:2  32768.0090690b4fd1     20000  BLK    ALT
ge-11/1/1        128:4        128:3  32768.0090690b4fd1     20000  BLK    ALT
ge-11/1/4        128:5        128:1  32768.0090690b47d1     20000  BLK    ALT
xe-10/0/0        128:6        128:5  32768.0090690b4fd1      2000  BLK    ALT
xe-10/2/0        128:7        128:4  32768.0090690b47d1      2000  FWD    ROOT

show spanning-tree interface (VSTP)

user@host> show spanning-tree interface 
Spanning tree interface parameters for instance 0

Interface    Port ID    Designated      Designated         Cost    State  Role
                         port ID        bridge ID
ge-1/0/1         128:1        128:1  28672.0090690b3fe0     20000  FWD    DESG
ge-1/0/2         128:2        128:2  28672.0090690b3fe0     20000  FWD    DESG

Spanning tree interface parameters for VLAN 10

Interface    Port ID    Designated      Designated         Cost    State  Role
                         port ID        bridge ID
ge-1/0/1         128:1        128:1  28672.0090690b3fe0     20000  FWD    DESG
ge-1/0/2         128:2        128:2  28672.0090690b3fe0     20000  FWD    DESG

Spanning tree interface parameters for VLAN 20

Interface    Port ID    Designated      Designated         Cost    State  Role
                         port ID        bridge ID
ge-1/0/1         128:1        128:1  28672.0090690b3fe0     20000  FWD    DESG
ge-1/0/2         128:2        128:2  28672.0090690b3fe0     20000  FWD    DESG

show spanning-tree interface vlan-id (VSTP)

user@host> show spanning-tree interface vlan-id 10 
Spanning tree interface parameters for VLAN 10

Interface    Port ID    Designated      Designated         Cost    State  Role
                         port ID        bridge ID
ge-1/0/1         128:1        128:1  28672.0090690b3fe0     20000  FWD    DESG
ge-1/0/2         128:2        128:2  28672.0090690b3fe0     20000  FWD    DESG
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