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Dell Command Line Reference Guide for the S4048–ON System 9.14.2.8

spanning-tree rstp

Configure an RSTP interface with one of these settings: port cost, edge port with optional bridge port data unit (BPDU) guard, port priority, loop guard, or root guard.

Syntax
spanning-tree rstp {cost port-cost | edge-port [bpduguard [shutdown-on-violation]] | priority priority | {loopguard | rootguard}}
Parameters
cost port-cost
Enter the keyword cost then the port cost value. The range is from 1 to 200000. The defaults are:
  • 100 Mb/s Ethernet interface = 200000
  • 1-Gigabit Ethernet interface = 20000
  • 10-Gigabit Ethernet interface = 2000
  • Port Channel interface with one 100 Mb/s Ethernet = 200000
  • Port Channel interface with one 1 Gigabit Ethernet = 20000
  • Port Channel interface with one 10 Gigabit Ethernet = 2000
  • Port Channel with two 1 Gigabit Ethernet = 18000
  • Port Channel with two 10 Gigabit Ethernet = 1800
  • Port Channel with two 100 Mbps Ethernet = 180000
edge-port
Enter the keywords edge-port to configure the interface as a rapid spanning tree edge port.
bpduguard

(OPTIONAL) Enter the keyword portfast to enable Portfast to move the interface into Forwarding mode immediately after the root fails.

Enter the keyword bpduguard to disable the port when it receives a BPDU.

shutdown-on-violation
(OPTIONAL) Enter the keywords shutdown-on-violation to hardware disable an interface when a BPDU is received and the port is disabled.
priority priority
Enter keyword priority then a value in increments of 16 as the priority. The range is from 0 to 240. The default is 128.
loopguard
Enter the keyword loopguard to enable loop guard on an RSTP port or port-channel interface.
rootguard
Enter the keyword rootguard to enable root guard on an RSTP port or port-channel interface.
Defaults
Not configured.
Command Modes
INTERFACE
Command History

This guide is platform-specific. For command information about other platforms, see the relevant Dell EMC Networking OS Command Line Reference Guide.

Version
Description
9.10(0.1)
Introduced on the S6010-ON and S4048T-ON.
9.10(0.0)
Introduced on the S3148.
9.10(0.0)
Introduced on the S6100-ON.
9.8(2.0)
Introduced on the S3100 series.
9.8(1.0)
Introduced on the Z9100-ON.
9.8(0.0P5)
Introduced on the S4048-ON.
9.8(0.0P2)
Introduced on the S3048-ON.
9.7(0.0)
Introduced on the S6000-ON.
9.2(1.0)
Introduced on the Z9500.
9.0.2.0
Introduced on the S6000.
8.3.19.0
Introduced on the S4820T.
8.3.11.1
Introduced on the Z9000.
8.4.2.1
Added support for the optional guard keyword on the C-Series, S-Series, and E-Series.
8.3.7.0
Introduced on the S4810.
8.2.1.0
Introduced the hardware shutdown-on-violation options.
7.6.1.0
Introduced on the S-Series.
7.5.1.0
Introduced on the C-Series.
7.4.1.0
Added the optional bridge port data unit (BPDU) guard.
6.2.1.1
Introduced on the E-Series.
Usage Information

The BPDU guard option prevents the port from participating in an active STP topology in case a BPDU appears on a port unintentionally, or is misconfigured, or is subject to a DOS attack. This option places the port into an Error Disable state if a BPDU appears and a message is logged so that the administrator can take corrective action.

NOTE A port configured as an edge port, on an RSTP switch, immediately transitions to the Forwarding state. Only configure ports connected to end-hosts as edge ports. Consider an edge port similar to a port with a spanning-tree portfast enabled.

If you do not enable shutdown-on-violation, BPDUs are still sent to the RPM CPU.

You cannot enable STP root guard and loop guard at the same time on a port. For example, if you configure loop guard on a port on which root guard is already configured, the following error message displays: % Error: RootGuard is configured. Cannot configure LoopGuard.

Enabling Portfast BPDU guard and loop guard at the same time on a port results in a port that remains in a Blocking state and prevents traffic from flowing through it. For example, when Portfast BPDU guard and loop guard are both configured:
  • If a BPDU is received from a remote device, BPDU guard places the port in an Err-Disabled Blocking state and no traffic is forwarded on the port.
  • If no BPDU is received from a remote device, loop guard places the port in a Loop-Inconsistent Blocking state and no traffic is forwarded on the port.
Example
DellEMC(conf)# interface tengigabitethernet 4/1
DellEMC(conf-if-gi-4/0)# spanning-tree rstp edge-port
DellEMC(conf-if-gi-4/0)# show config
!
interface TenGigabitEthernet 4/1
  no ip address
  switchport
  spanning-tree rstp edge-port
  no shutdown
DellEMC#

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