STP

STP View

Table 1 STP View

Command	Purpose
show mstp bridge	Display MSTI status.
show mstp brief [{ethernet|link-aggregation} interface_name]	Display information about the port status in CIST.
show mstp interface [{ethernet|link-aggregation} interface_name]	Display detailed information about the status of the ports in CIST.
show mstp mstconfid	Display summary information about the MST domain configuration currently in effect.
show mstp status	Display status of MSTP.
show mstp tree instance-id	Display MSTI status of the specified MSTP instance.
show mstp treeport {ethernet|link-aggregation} interface_name instance instance-id	Displays MSTI port status details.

show mstp bridge

[Command]

show mstp bridge

[Purpose]

Display MSTI status.

[View]

Privileged User View

[Use Cases]

sonic# show mstp bridge
Bridge CIST info
  enabled yes
  bridge id 8.000.00:00:01:02:03:04
  designated root 8.000.00:00:01:02:03:04
  regional root 8.000.00:00:01:02:03:04
  root port none
  path cost 0 internal path cost 0
  max age 20 bridge max age 20
  forward delay 15 bridge forward delay 15
  tx hold count 6 max hops 20
  hello time 2 ageing time 300
  force protocol version mstp
  time since topology change 2497
  topology change count 9
  topology change no
  topology change port Ethernet64
  last topology change port PortChannel0111

show mstp brief [{ethernet|link-aggregation} interface_name]

[Command]

show mstp brief [{ethernet|link-aggregation} interface_name]

[Purpose]

Display information about the status of ports in CIST.

[Parameters]

Parameter	Description
interface_name	interface name

[View]

Privileged User View

[Use Cases]

sonic# show mstp brief
port bridge point-to-point oper-edge-port port-id enabled state role designated-bridge designated-port designated-root
--------------- -------- ---------------- ---------------- --------- --------- ---------- ---------- ----------------------- ----------------- -----------------------
0/8 Bridge yes yes 8.002 yes forwarding Designated 8.000.60:EB:5A:01:06:6D 8.002 8.000.60:EB:5A:01:06:6D
lag111 Bridge no no 8.003 no discarding Disabled 8.000.60:EB:5A:01:06:6D 0 8.000.60:EB:5A:01:06:6D

show mstp interface [{ethernet|link-aggregation} interface_name]

[Command]

show mstp interface [{ethernet|link-aggregation} interface_name]

[Purpose]

Display detailed information about the status of the ports in CIST.

[Parameters]

Parameter	Description
interface_name	interface name

[View]

Privileged User View

[Use Cases]

sonic# show mstp interface
Bridge:0/2 CIST info
  enabled            no                      role                 Disabled
  port id            8.006                   state                discarding
  external port cost 200000000               admin external cost  0
  internal port cost 200000000               admin internal cost  0
  designated root    8.000.60:EB:5A:01:10:C9 dsgn external cost   0
  dsgn regional root 8.000.60:EB:5A:01:10:C9 dsgn internal cost   0
  designated bridge  8.000.60:EB:5A:01:10:C9 designated port      0.000
  admin edge port    no                      auto edge port       yes
  oper edge port     no                      topology change ack  no
  point-to-point     no                      admin point-to-point auto
  restricted role    no                      restricted TCN       no
  port hello time    2                       disputed             no
  bpdu guard port    no                      bpdu guard error     no
  network port       no                      BA inconsistent      no
  bpdu filter port   no                      Num RX BPDU Filtered 0
  Num TX BPDU        0                       Num TX TCN           0
  Num RX BPDU        0                       Num RX TCN           0
  Num Transition FWD 0                       Num Transition BLK   1
  Rcvd BPDU          no                      Rcvd STP             no
  Rcvd RSTP          no                      Send RSTP            yes
  Rcvd TC Ack        no                      Rcvd TCN             no

show mstp mstconfid

[Command]

show mstp mstconfid

[Purpose]

Display summary information about the MST domain configuration currently in effect.

[View]

Privileged User View

[Use Cases]

sonic# show mstp mstconfid
Bridge MST Configuration Identifier:
  Format Selector: 0
  Configuration Name: test
  Revision Level: 0
  Configuration Digest: F3B784B6F462AE5FE28E6578DBF77D2E

show mstp status

[Command]

show mstp status

[Purpose]

Display status of MSTP.

[View]

Privileged User View

[Use Cases]

sonic# show mstp status
role Flags: Root - Root, Desg - Designated, Altn - Alternate, Back - Backup, Mstr - Master, Disa - Disabled
state Flags: disc - Discard/Blocking/Listening,  lear - Learning, forw - Forwarding
Spanning-tree Mode: mstp
vlan       mst instance  port_role_state
-------  --------------  -------------------------------------------------------
vlan10                0  lag5(Desg)(forw) lag9(Desg)(forw)
vlan20                0

show mstp tree instance-id

[Command]

show mstp tree instance-id

[Purpose]

Display MSTI status of the specified MSTP instance.

[Parameters]

Parameter	Description
instance-id	MSTP instance ID.

[View]

Privileged User View

[Use Cases]

sonic# show mstp tree 0
Bridge MSTI 0 info
  bridge id 8.000.00:00:01:02:03:04
  regional root 8.000.00:00:01:02:03:04
  root port none
  internal path cost 0
  time since topology change 2560
  topology change count 9
  topology change no
  topology change port Ethernet64
  last topology change port PortChannel0111
sonic# show mstp tree 1
Bridge MSTI 1 info
  bridge id 8.001.00:00:01:02:03:04
  regional root 8.001.00:00:01:02:03:04
  root port none
  internal path cost 0
  time since topology change 2563
  topology change count 9
  topology change no
  topology change port Ethernet64
  last topology change port PortChannel0111

show mstp treeport {ethernet|link-aggregation} interface_name instance instance-id

[Command]

show mstp treeport {ethernet|link-aggregation} interface_name instance instance-id

[Purpose]

Displays MSTI port status details.

[Parameters]

Parameter	Description
interface_name	interface name
instance-id	MSTP instance ID

[View]

Privileged User View

[Use Cases]

sonic# show mstp treeport ethernet 0/64 instance 1
Bridge:0/64 MSTI 1 info
  role Designated port id 8.00A
  state forwarding disputed no
  internal port cost 200 admin internal cost 0
  dsgn regional root 8.001.00:00:01:02:03:04 dsgn internal cost 0
  designated bridge 8.001.00:00:01:02:03:04 designated port 8.00A
sonic# show mstp treeport ethernet 0/64 instance 3
Bridge:0/64 MSTI 3 info
  role Root port id 8.00A
  state forwarding disputed no
  internal port cost 200 admin internal cost 0
  dsgn regional root 0.003.60:EB:5A:01:14:CC dsgn internal cost 0
  designated bridge 0.003.60:EB:5A:01:14:CC designated port 8.004

STP Config

Table 2 STP Config

Command	Purpose
bridge mac HH:HH:HH:HH:HH:HH	Configure Bridge MAC address.
mstp enable	Enable MSTP globally.
mstp {forward_delay|hello|max_age|name} value	Set the attributes of MSTP.
mstp cost interface {ethernet|link-aggregation} interface_name cost_value	Set the external path cost.
mstp instance instance-id	Create a MSTP instance and enter MSTP Instance Configuration View.
priority priority	Set the priority of the MSTP instance.
interface priority priority interface {ethernet|link-aggregation} interface_name	Set the interface priority of all member ports under the MSTP instance.
vlan vlan-id (MSTP Instance Configuration View)	Bind the VLAN to the MSTP instance.
mstp cost interface {ethernet|link-aggregation} interface_name cost_value	Set the internal path csot of the instance.
mstp auto-edge enable interface {ethernet|link-aggregation} interface_name	Enable MSTP auto edge for the interface.
mstp edge-port enable interface {ethernet|link-aggregation} interface_name	Enable MSTP manual edge for the interface.
mstp bpdu-filter enable interface {ethernet|link-aggregation} interface_name	Enable BPDU filtering for the interface.
mstp bpdu-guard enable interface {ethernet|link-aggregation} interface_name	Enable BPDU guard for the interface.

bridge mac HH:HH:HH:HH:HH:HH

[Command]

bridge mac HH:HH:HH:HH:HH:HH

[Purpose]

Configure Bridge MAC address.

[Parameters]

Parameter	Description
HH:HH:HH:HH:HH:HH	MAC address.

[View]

Global Configuration View

[Notes]

The default is the MAC of the switch; Run command no bridge mac to restore the Bridge MAC address to default.

[Use Cases]

sonic(config)# bridge mac 00:44:55:66:77:88

mstp enable

[Command]

mstp enable

[Purpose]

Enable MSTP globally.

[View]

Global Configuration View

[Notes]

Run command mstpdisable to disable MSTP.

[Use Cases]

sonic(config)# mstp enable

mstp {forward_delay|hello|max_age|name} value

[Command]

mstp {forward_delay|hello|max_age|name} value

[Purpose]

Set the attributes of MSTP.

[Parameters]

Parameter	Description
forward_delay	Specify the port state changing time in seconds. The range is [4,30], and the default is 15.
hello	Specify the interval of sending BPDUs in seconds. The range is [1,10], and the default is 2.
max_age	Specify the maximum aging value in seconds. The range is [10,1000000], and the default is 20.
name	Specify the domain name of the Bridge in string form.
value	The value of the attribute.

[View]

Global Configuration View

[Notes]

MSTP should be enabled before configuration. Run command no mstp {forward_delay|hello|max_age|name} to restore to default configuration.

[Use Cases]

sonic(config)# mstp hello 5
sonic(config)# mstp name region1

mstp cost interface {ethernet|link-aggregation} interface_name cost_value

[Command]

mstp cost interface {ethernet|link-aggregation} interface_name cost_value

[Purpose]

Set the external path cost.

[Parameters]

Parameter	Description
interface_name	Interface name (eg.0/1)
cost_value	Specify the cost, and the range is [1,200000000]

[View]

Global Configuration View

[Notes]

MSTP should be enabled before configuration. The default cost can be calculated as: cost = 200000000 / link speed (in 100Kbps). Run command no mstp cost interface {ethernet|link-aggregation} interface_name to restore to default cost.

[Use Cases]

sonic(config)# mstp cost interface ethernet 0/0 10

mstp instance instance-id

[Command]

mstp instance instance-id

[Purpose]

Create a MSTP instance and enter MSTP Instance Configuration View.

[Parameters]

Parameter	Description
instance-id	MSTP instance ID, the range is [0,63].

[View]

Global Configuration View

[Notes]

MSTP should be enabled before configuration. Instance 0 is the default instance, cannot be created or deleted. Run command no mstp instance instance-id to delete MSTP instance.

[Use Cases]

sonic(config)# mstp instance 2
sonic(config-mstp-instance-2)#

priority priority

[Command]

priority priority

[Purpose]

Set the priority of the MSTP instance.

[Parameters]

Parameter	Description
priority	Specify the priority of the instance, the range is [0,15]. The default is 8. The smaller the value, the higher the priority.

[View]

MSTP Instance Configuration View

[Notes]

MSTP should be enabled before configuration. Run command no priority to restore to default priority.

[Use Cases]

sonic(config)# mstp instance 2
sonic(config-mstp-instance-2)# priority 1

interface priority priority interface {ethernet|link-aggregation} interface_name

[Command]

interface priority priority interface {ethernet|link-aggregation} interface_name

[Purpose]

Set the interface priority under the MSTP instance.

[Parameters]

Parameter	Description
priority	Specify the priority of the interfaces, the range is [0,15]. The default is 8. The smaller the value, the higher the priority.

[View]

MSTP Instance Configuration View

[Notes]

MSTP should be enabled before configuration. Run command no interface priority interface {ethernet|link-aggregation} interface_name to restore to default priority.

[Use Cases]

sonic(config)# mstp instance 2
sonic(config-mstp-instance-2)# interface priority 1 interface ethernet 0/0

vlan vlan-id

[Command]

vlan vlan-id

[Purpose]

Bind the VLAN to the MSTP instance.

[Parameters]

Parameter	Description
vlan-id	VLAN ID, the range is [1,4094].

[View]

MSTP Instance Configuration View

[Notes]

MSTP should be enabled before configuration. Run command no vlan vlan-id to unbind the VLAN from the MSTP instance.

[Use Cases]

sonic(config)# mstp instance 2
sonic(config-mstp-instance-2)# vlan 100

cost interface {ethernet|link-aggregation} interface_name cost_value

[Command]

cost interface {ethernet|link-aggregation} interface_name cost_value

[Purpose]

Set the internal path csot of the instance.

[Parameters]

Parameter	Description
interface_name	Interface name (eg.0/1)
cost_value	Specify the cost, and the range is [1,200000000]

[View]

MSTP Instance Configuration View

[Notes]

MSTP should be enabled before configuration. The default cost can be calculated as: cost = 200000000 / link speed (in 100Kbps). Run command no cost interface {ethernet|link-aggregation} interface_nam to restore to default cost.

[Use Cases]

sonic(config)# mstp instance 0
sonic(config-mstp-instance-0)# cost interface ethernet 0/0 10

mstp auto-edge enable interface {ethernet|link-aggregation} interface_name

[Command]

mstpauto-edge enable interface {ethernet|link-aggregation} interface_name

[Purpose]

Enable MSTP auto edge for the interface.

[Parameters]

Parameter	Description
interface_name	Interface name (eg.0/1)

[View]

Global Configuration View

[Notes]

The auto-edge interface feature is enabled by default on all Layer 2 ports. An interface with auto-edge enabled does the following things when its state changes from down to up: waiting for 3 seconds and trying to receive BPDUs; If no BPDU is received, it becomes an edge port and will lose edge port role the first time it receives a BPDU thereafter. Run command mstp auto-edge disable interface {ethernet|link-aggregation} interface_name to disable auto edge port, after that, if you do not assign it as a manual edge port, it will lose edge port role.

[Use Cases]

sonic(config)# mstp auto-edge enable interface link-aggregation 99

mstp edge-port enable interface {ethernet|link-aggregation} interface_name

[Command]

mstp edge-port enable interface {ethernet|link-aggregation} interface_name

[Purpose]

Enable MSTP manual edge for the interface.

[Parameters]

Parameter	Description
interface_name	Interface name (eg.0/1)

[View]

Global Configuration View

[Notes]

Manual edge port is disabled by default on all Layer 2 ports. When a manual edge port is enabled on an interface, it immediately becomes an edge port until it receives a BPDU message. The priority of manual edge port configuration is higher than auto edge port, that is, when manual edge port is enabled, auto edge port configuration is invalid. Run command mstp edge-port disable interface {ethernet|link-aggregation} interface_name to disable MSTP manual edge port feature.

[Use Cases]

sonic(config)# mstp edge-port enable interface link-aggregation 99

mstp bpdu-filter enable interface {ethernet|link-aggregation} interface_name

[Command]

mstp bpdu-filter enable interface {ethernet|link-aggregation} interface_name

[Purpose]

Enable BPDU filtering for the interface.

[Parameters]

Parameter	Description
interface_name	Interface name (eg.0/1)

[View]

Global Configuration View

[Notes]

This command will enable MSTP at interface level and determines whether the interface participates in MSTP protocol operation. The interface to be operated should be a Layer 2 port, and MSTP should be enabled before configuration. By default, MSTP is enabled on all Layer 2 interfaces. After this function is enabled, the interface will not participate in MSTP protocol operation, and there will be a risk of loops, therefore, please take caution. Run command mstp bpdu-filter disable interface {ethernet|link-aggregation} interface_name to disable BPDU filtering.

[Use Cases]

sonic(config)# mstp bpdu-filter enable interface link-aggregation 99

mstp bpdu-guard enable interface {ethernet|link-aggregation} interface_name

[Command]

mstp bpdu-guard enable interface {ethernet|link-aggregation} interface_name

[Purpose]

Enable BPDU guard for the interface.

[Parameters]

Parameter	Description
interface_name	Interface name (eg.0/1)

[View]

Global Configuration View

[Notes]

When the interface is enabled with BPDU message protection, it will be admin down if received a BPDU. Run command mstp bpdu-guard disable interface {ethernet|link-aggregation} interface_name to disable BPDU guard.

[Use Cases]

sonic(config)# mstp bpdu-guard enable interface link-aggregation 99