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Home Documentation Junos OS Junos CLI Reference CLI Reference S

Junos CLI Reference

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Junos CLI Reference
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show spanning-tree bridge

date_range 19-Nov-23
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Syntax

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

Syntax (QFX Series and EX Series)

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

Description

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

Options

none

(Optional) Display brief STP 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.

routing-instance routing-instance-name

(Optional) Display STP bridge information for the specified routing instance.

vlan-id 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

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

Routing instance name

Name of the routing instance under which the bridge is configured.

Enabled protocol

Spanning Tree Protocol type enabled.

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.

Root cost

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

Root port

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

CIST regional root

Bridge ID of the elected MSTP regional root bridge.

CIST internal root cost

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

Hello time

Configured number of seconds between transmissions of configuration BPDUs.

Maximum age

Configured maximum expected arrival time of hello bridge protocol data units (BPDUs).

Forward delay

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

Hop count

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

Message age

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

Number of topology changes

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

Time since last topology change

Number of elapsed seconds since the most recent topology change.

Bridge ID (Local)

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

Extended system ID

System identifier.

MSTI regional root

Bridge ID of the elected MSTP regional root bridge.

Sample Output

show spanning-tree bridge routing-instance

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user@host> show spanning-tree bridge routing-instance vs1 detail
STP bridge parameters
Routing instance name               : vs1
Enabled protocol                    : MSTP

STP bridge parameters for CIST
  Root ID                           : 32768.00:13:c3:9e:c8:80
  Root cost                         : 0
  Root port                         : ge-10/2/0
  CIST regional root                : 32768.00:13:c3:9e:c8:80
  CIST internal root cost           : 22000
  Hello time                        : 2 seconds
  Maximum age                       : 20 seconds
  Forward delay                     : 15 seconds
  Hop count                         : 18
  Message age                       : 0
  Number of topology changes        : 1
  Time since last topology change   : 1191 seconds
  Local parameters
    Bridge ID                       : 32768.00:90:69:0b:7f:d1
    Extended system ID              : 1

STP bridge parameters for MSTI 1
  MSTI regional root                : 32769.00:13:c3:9e:c8:80
  Root cost                         : 22000
  Root port                         : ge-10/2/0
  Hello time                        : 2 seconds
  Maximum age                       : 20 seconds
  Forward delay                     : 15 seconds
  Hop count                         : 18
  Number of topology changes        : 1
  Time since last topology change   : 1191 seconds
  Local parameters
    Bridge ID                       : 32769.00:90:69:0b:7f:d1
    Extended system ID              : 1

STP bridge parameters for MSTI 2
  MSTI regional root                : 32770.00:13:c3:9e:c8:80
  Root cost                         : 22000
  Root port                         : ge-10/2/0
  Hello time                        : 2 seconds
  Maximum age                       : 20 seconds
  Forward delay                     : 15 seconds
  Hop count                         : 18
  Number of topology changes        : 1
  Time since last topology change   : 1191 seconds
  Local parameters
    Bridge ID                       : 32770.00:90:69:0b:7f:d1
    Extended system ID              : 1

show spanning-tree bridge msti

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user@host> show spanning-tree bridge msti 1 routing-instance vs1 detail
STP bridge parameters
Routing instance name               : vs1
Enabled protocol                    : MSTP

STP bridge parameters for MSTI 1
  MSTI regional root                : 32769.00:13:c3:9e:c8:80
  Root cost                         : 22000
  Root port                         : xe-10/2/0
  Hello time                        : 2 seconds
  Maximum age                       : 20 seconds
  Forward delay                     : 15 seconds
  Hop count                         : 18
  Number of topology changes        : 1
  Time since last topology change   : 1191 seconds
  Local parameters
    Bridge ID                       : 32769.00:90:69:0b:7f:d1
    Extended system ID              : 1

show spanning-tree bridge vlan-id (MSTP)

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user@host> show spanning-tree bridge vlan-id 1 101 routing-instance vs1 detail
STP bridge parameters
Routing instance name               : vs1
Enabled protocol                    : MSTP

STP bridge parameters for CIST
  Root ID                           : 32768.00:13:c3:9e:c8:80
  Root cost                         : 0
  Root port                         : xe-10/2/0
  CIST regional root                : 32768.00:13:c3:9e:c8:80
  CIST internal root cost           : 22000
  Hello time                        : 2 seconds
  Maximum age                       : 20 seconds
  Forward delay                     : 15 seconds
  Hop count                         : 18
  Message age                       : 0
  Number of topology changes        : 0
  Local parameters
    Bridge ID                       : 32768.00:90:69:0b:7f:d1
    Extended system ID              : 1
    Hello time                      : 2 seconds
    Maximum age                     : 20 seconds
    Forward delay                   : 15 seconds
    Path cost method                : 32 bit
    Maximum hop count               : 20

show spanning-tree bridge (RSTP)

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user@host> show spanning-tree bridge
STP bridge parameters
Routing instance name               : GLOBAL
Enabled protocol                    : RSTP
  Root ID                           : 28672.00:90:69:0b:3f:d0
  Hello time                        : 2 seconds
  Maximum age                       : 20 seconds
  Forward delay                     : 15 seconds
  Message age                       : 0
  Number of topology changes        : 58
  Time since last topology change   : 14127 seconds
  Local parameters
    Bridge ID                       : 28672.00:90:69:0b:3f:d0
    Extended system ID              : 0

 STP bridge parameters for bridge VLAN 10
   Root ID                         : 28672.00:90:69:0b:3f:d0
   Hello time                      : 2 seconds
   Maximum age                     : 20 seconds
   Forward delay                   : 15 seconds
   Message age                     : 0
   Number of topology changes      : 58
   Time since last topology change : 14127 seconds
   Local parameters
     Bridge ID                     : 28672.00:90:69:0b:3f:d0
     Extended system ID            : 0

 STP bridge parameters for bridge VLAN 20
   Root ID                         : 28672.00:90:69:0b:3f:d0
   Hello time                      : 2 seconds
   Maximum age                     : 20 seconds
   Forward delay                   : 15 seconds
   Message age                     : 0
   Number of topology changes      : 58
   Time since last topology change : 14127 seconds
   Local parameters
     Bridge ID                     : 28672.00:90:69:0b:3f:d0
     Extended system ID            : 0

show spanning-tree bridge vlan-id (RSTP)

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user@host> show spanning-tree bridge vlan-id 10
STP bridge parameters
Routing instance name               : GLOBAL
Enabled protocol                    : RSTP

 STP bridge parameters for VLAN 10
   Root ID                         : 28672.00:90:69:0b:3f:d0
   Hello time                      : 2 seconds
   Maximum age                     : 20 seconds
   Forward delay                   : 15 seconds
   Message age                     : 0
   Number of topology changes      : 58
   Time since last topology change : 14127 seconds
   Local parameters
     Bridge ID                     : 28672.00:90:69:0b:3f:d0
     Extended system ID            : 0

Release Information

Command introduced in Junos OS Release 8.4.

Related Documentation

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