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    show spanning-tree bridge

    Syntax

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

    Release Information

    Command introduced in Junos OS Release 9.0 for EX Series switches.

    Description

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

    Options

    none
    		—

    (Optional) Display brief spanning-tree protocol bridge information for all Multiple Spanning Tree Instances (MSTIs).

    brief | detail
    		—

    (Optional) Display the specified level of output.

    msti msti-id
    		—

    (Optional) Display spanning-tree protocol bridge information for the specified MSTI or Common and Internal Spanning Tree (CIST). Specify 0 for CIST. Specify a value from 1 through 4094 for an MSTI.

    vlan vlan-id
    		—

    (Optional) Display spanning-tree protocol bridge information for the specified VLAN. Specify a VLAN tag identifier from 1 through 4094.

    Required Privilege Level

    view

     

    Related Documentation

     

    List of Sample Output

    show spanning-tree bridge
    show spanning-tree bridge brief
    show spanning-tree bridge detail

    Output Fields

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

    Table 1: show spanning-tree bridge Output Fields

    Field Name

    Field Description

    Level of Output

    Context ID

    An internally generated identifier.

    VSTP all, RSTP all, MSTP all, STP all

    Enabled protocol

    Spanning-tree protocol type enabled.

    VSTP all, RSTP all, MSTP all, STP all

    Root ID

    Bridge ID of the elected spanning tree root bridge. The bridge ID consists of a configurable bridge priority and the MAC address of the bridge.

    VSTP all, RSTP all, MSTP all, STP all

    Root cost

    Calculated cost to reach the root bridge from the bridge where the command is entered.

    VSTP all

    Root port

    Interface that is the current elected root port for this bridge.

    VSTP all

    CIST regional root

    Bridge ID of the elected MSTP regional root bridge.

    MSTP all

    CIST internal root cost

    Calculated cost to reach the regional root bridge from the bridge where the command is entered.

    MSTP all

    Hello time

    Configured number of seconds between transmissions of configuration BPDUs.

    VSTP all, RSTP all, MSTP all, STP all

    Maximum age

    Maximum age of received protocol BPDUs.

    VSTP all, RSTP all, MSTP all, STP all

    Forward delay

    Configured time an STP bridge port remains in the listening and learning states before transitioning to the forwarding state.

    VSTP all, RSTP all, MSTP all, STP all

    Message age

    Number of seconds elapsed since the most recent BPDU was received.

    VSTP all, RSTP all, STP all

    Number of topology changes

    Total number of STP topology changes detected since the switch last booted.

    VSTP all, RSTP all, MSTP all, STP all

    Time since last topology change

    Number of seconds elapsed since the most recent topology change.

    RSTP detail

    Topology change initiator

    Interface name of the interface that received the topology change request.

    RSTP detail

    Topology change last recvd. from

    Bridge ID of the bridge that requested the last topology change.

    RSTP detail

    Bridge ID (local)

    Locally configured bridge ID. The bridge ID consists of a configurable bridge priority and the MAC address of the bridge.

    VSTP all, RSTP all, MSTP all, STP all

    Extended system ID (local)

    Internally generated system identifier.

    VSTP all, RSTP all, MSTP all, STP all

    MSTI regional root

    Bridge ID of the elected MSTP regional root bridge.

    MSTP detail

    Internal instance ID (local)

    An internally generated identifier.

    VSTP all, RSTP all, MSTP all, STP all

    Hello time (local)

    Configured number of seconds between transmissions of configuration BPDUs.

    RSTP detail, MSTP detail, STP detail

    Maximum age (local)

    Maximum age of received protocol BPDUs.

    VSTP detail, RSTP detail, MSTP detail, STP detail

    Forward delay (local)

    Configured time an STP bridge port remains in the listening and learning states before transitioning to the forwarding state.

    RSTP detail, MSTP detail, STP detail

    Path Cost Method (local)

    Bridges supporting 802.1D (legacy) implement only 16-bit values for path cost. Newer versions of this standard support 32-bit values.

    VSTP detail, RSTP detail, MSTP detail, STP detail

    Maximum Hop count (local)

    Configured maximum number of hops a BPDU can be forwarded in the MSTP region.

    MSTP detail

    Sample Output

    show spanning-tree bridge

    user@switch> show spanning-tree bridge
     STP bridge parameters
 Context ID                          : 0
 Enabled protocol                    : MSTP
 
 STP bridge parameters for CIST
   Root ID                           : 32768.00:11:f2:56:df:40
   Root cost                         : 0
   Root port                         : ge-0/0/1.0
   CIST regional root                : 32768.00:11:f2:56:df:40
   CIST internal root cost           : 20000
   Hello time                        : 2 seconds
   Maximum age                       : 20 seconds
   Forward delay                     : 15 seconds
   Hop count                         : 19
   Message age                       : 0
   Number of topology changes        : 1
   Time since last topology change   : 108 seconds
   Topology change initiator         : ge-0/0/1.0                     
   Topology change last recvd. from  : 00:11:f2:56:df:4c
   Local parameters
     Bridge ID                       : 32768.00:11:f2:57:1c:00
     Extended system ID              : 0
     Internal instance ID            : 0
 
 STP bridge parameters for MSTI 10
   MSTI regional root                : 32778.00:11:f2:56:df:40
   Root cost                         : 20000
   Root port                         : ge-0/0/1.0
   Hello time                        : 2 seconds
   Maximum age                       : 20 seconds
   Forward delay                     : 15 seconds
   Hop count                         : 19
   Number of topology changes        : 1
   Time since last topology change   : 108 seconds
   Topology change initiator         : ge-0/0/1.0
   Topology change last recvd. from  : 00:11:f2:56:df:41
   Local parameters
     Bridge ID                       : 32778.00:11:f2:57:1c:00
     Extended system ID              : 0
     Internal instance ID            : 1

    show spanning-tree bridge brief

    user@switch> show spanning-tree bridge brief
    STP bridge parameters 
Context ID      : 0
Enabled protocol    : RSTP
  Root ID       : 32768.00:19:e2:50:95:a0
  Hello time        : 2 seconds
  Maximum age       : 20 seconds
  Forward delay     : 15 seconds
  Message age       : 0 
  Number of topology changes    : 0
  Local parameters 
    Bridge ID       : 32768.00:19:e2:50:95:a0
    Extended system ID      : 0
    Internal instance ID    : 0

    show spanning-tree bridge detail

    user@switch> show spanning-tree bridge detail
      
STP bridge parameters 
Context ID      : 0
Enabled protocol    : RSTP
  Root ID       : 32768.00:19:e2:50:95:a0
  Hello time        : 2 seconds
  Maximum age       : 20 seconds
  Forward delay     : 15 seconds
  Message age       : 0 
  Number of topology changes    : 0
  Local parameters 
    Bridge ID       : 32768.00:19:e2:50:95:a0
    Extended system ID      : 0
    Internal instance ID    : 0
    Hello time      : 2 seconds
    Maximum age     : 20 seconds
    Forward delay       : 15 seconds
    Path cost method    : 32 bit

    Modified: 2016-08-12

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