show spanning-tree interface

Syntax



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

Release Information

Command introduced in JUNOS Release 9.0 for EX-series switches.

Description

Display the configured or calculated interface-level spanning-tree protocol (can be either STP, RSTP, or MSTP) parameters.

Options

none — (Optional) Display brief STP interface information.

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

interface-name interface-name — (Optional) Name of an interface.

msti msti-id — (Optional) Display STP bridge information for the specified MSTP instance ID or Common and Internal Spanning Tree (CIST). Specify 0 for CIST. Specify a value from 1 through 4094 for an MSTI.

vlan-id vlan-id — (Optional) For MSTP interfaces, display interface information for the specified VLAN. Specify a value from 0 through 4094.

Required Privilege Level

view

List of Sample Output

show spanning-tree interface
show spanning-tree interface brief
show spanning-tree interface detail
show spanning-tree interface ge-1/0/0

Output Fields

Table 1 lists the output fields for the show spanning-tree Interface command. Output fields are listed in the approximate order in which they appear.

Table 1: show spanning-tree interface Output Fields

Field Name	Field Description
Interface name	Interface configured to participate in the STP, RSTP, or MSTP instance.
Port ID	Logical interface identifier configured to participate in the MSTP instance.
Designated port ID	Port ID of the designated port for the LAN segment this interface is attached to.
Designated bridge ID	Bridge ID of the designated bridge for the LAN segment this interface is attached to.
Port Cost	Configured cost for the interface.
Port State	STP port state. Forwarding (FWD), blocking (BLK), listening, learning, or disabled.
Port Role	MSTP or RSTP port role. Designated (DESG), backup (BKUP), alternate (ALT), or root.
Link type	MSTP or RSTP link type. Shared or point-to-point (pt-pt) and edge or non edge.
Alternate	Identifies the interface as an MSTP 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).

show spanning-tree interface

user@switch> show spanning-tree interface

Spanning tree interface parameters for instance 0

Interface    Port ID    Designated      Designated         Port    State  Role
                         port ID        bridge ID          Cost
ge-0/0/0.0     128:513      128:513   8192.0019e2500340      1000  FWD    DESG 
ge-0/0/2.0     128:515      128:515   8192.0019e2500340      1000  BLK    DIS  
ge-0/0/4.0     128:517      128:517   8192.0019e2500340      1000  FWD    DESG 
ge-0/0/23.0    128:536      128:536   8192.0019e2500340      1000  FWD    DESG 

Spanning tree interface parameters for instance 1

Interface    Port ID    Designated      Designated         Port    State  Role
                         port ID        bridge ID          Cost
ge-0/0/0.0     128:513      128:513   8193.0019e2500340      1000  FWD    DESG 
ge-0/0/2.0     128:515      128:515   8193.0019e2500340      1000  BLK    DIS  
ge-0/0/4.0     128:517      128:517   8193.0019e2500340      1000  FWD    DESG 
ge-0/0/23.0    128:536      128:536   8193.0019e2500340      1000  FWD    DESG 

Spanning tree interface parameters for instance 2

Interface    Port ID    Designated      Designated         Port    State  Role
                         port ID        bridge ID          Cost
ge-0/0/0.0     128:513        128:1   8194.001b549fd000      1000  FWD    ROOT 
ge-0/0/2.0     128:515      128:515  32770.0019e2500340      4000  BLK    DIS  
ge-0/0/4.0     128:517        128:1  16386.001b54013080      1000  BLK    ALT  
ge-0/0/23.0    128:536      128:536  32770.0019e2500340      1000  FWD    DESG

show spanning-tree interface brief

user@switch> show spanning-tree interface brief

Spanning tree interface parameters for instance 0

Interface    Port ID    Designated      Designated         Port    State  Role
                         port ID        bridge ID          Cost
ge-1/0/0.0     128:625      128:625  32768.0019e25095a0     20000  BLK    DIS  
ge-1/0/1.0     128:626      128:626  32768.0019e25095a0     20000  BLK    DIS  
ge-1/0/2.0     128:627      128:627  32768.0019e25095a0     20000  BLK    DIS  
ge-1/0/10.0    128:635      128:635  32768.0019e25095a0     20000  BLK    DIS  
ge-1/0/20.0    128:645      128:645  32768.0019e25095a0     20000  BLK    DIS  
ge-1/0/30.0    128:655      128:655  32768.0019e25095a0     20000  BLK    DIS

show spanning-tree interface detail

user@switch> show spanning-tree interface detail

Spanning tree interface parameters for instance 0

Interface name                 : ge-1/0/0.0
Port identifier                : 128.625
Designated port ID             : 128.625
Port cost                      : 20000
Port state                     : Blocking
Designated bridge ID           : 32768.00:19:e2:50:95:a0
Port role                      : Disabled
Link type                      : Pt-Pt/EDGE
Boundary port                   : NA 

Interface name                 : ge-1/0/1.0
Port identifier                : 128.626
Designated port ID             : 128.626
Port cost                      : 20000
Port state                     : Blocking
Designated bridge ID           : 32768.00:19:e2:50:95:a0
Port role                      : Disabled
Link type                      : Pt-Pt/NONEDGE
Boundary port                   : NA 

Interface name                 : ge-1/0/2.0
Port identifier                : 128.627
Designated port ID             : 128.627
Port cost                      : 20000
Port state                     : Blocking
Designated bridge ID           : 32768.00:19:e2:50:95:a0
Port role                      : Disabled
Link type                      : Pt-Pt/NONEDGE
Boundary port                   : NA 

Interface name                 : ge-1/0/10.0
Port identifier                : 128.635
Designated port ID             : 128.635
Port cost                      : 20000
Port state                     : Blocking
Designated bridge ID           : 32768.00:19:e2:50:95:a0
Port role                      : Disabled
Link type                      : Pt-Pt/NONEDGE
Boundary port                   : NA 

Interface name                 : ge-1/0/20.0
Port identifier                : 128.645
Designated port ID             : 128.645
Port cost                      : 20000
Port state                     : Blocking
Designated bridge ID           : 32768.00:19:e2:50:95:a0
Port role                      : Disabled
Link type                      : Pt-Pt/NONEDGE
Boundary port                   : NA 
[output truncated]

show spanning-tree interface ge-1/0/0

user@switch> show spanning-tree interface ge-1/0/0

Interface    Port ID    Designated      Designated         Port    State  Role
                         port ID        bridge ID          Cost
ge-1/0/0.0     128:625      128:625  32768.0019e25095a0     20000  BLK    DIS