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    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 OS 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. In brief mode, will not display interfaces that are administratively disabled or do not have a physical link.

    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), (ROOT), or Root Prevented (Root-Prev).

    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 non-alternate root port (no).

    Boundary Port

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

    Edge delay while expiry count

    Number of times the edge delay timer expired on that interface.

    Rcvd info while expiry count

    Number of times the rcvd info timer expired on that interface.

    Sample Output

    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 
    Edge delay while expiry count		: 0
    Rcvd info while expiry count			: 0       
     
    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
    Edge delay while expiry count		: 0
    Rvcd info while expiry count			: 0 
    
    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
    Edge delay while expiry count		: 0
    Rvcd info while expiry count			: 0 
    
    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 
    Edge delay while expiry count		: 0
    Rvcd info while expiry count			: 0
    
    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 
    Edge delay while expiry count		: 0
    Rvcd info while expiry count			: 0
    [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  
    

    Modified: 2016-12-06