Administrator Guide

• 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.
On the port extender (PE) ports and on VP-LAGs (LAGs created with PE):
• Spanning-tree with BPDU guard shutdown-on-violation is enabled as a default setting.
• No spanning tree command is valid. This command is not visible and issuing this command on VP-LAG ports
results in a failure.
Example
Dell(conf)#interface tengigabitethernet 2/0
Dell(conf-if-te-2/0)#spanning-tree rstp edge-port
Dell(conf-if-te-2/0)#show config
!
interface TenGigabitEthernet 2/0
no ip address
switchport
spanning-tree rstp edge-port
no shutdown
Dell#
tc-flush-standard
Enable the MAC address flushing after receiving every topology change notification.
C9000 Series
Syntax
tc-flush-standard
To disable, use the no tc-flush-standard command.
Defaults Disabled
Command Modes CONFIGURATION (conf-rstp)
Command History
This guide is platform-specific. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.9(0.0) Introduced on the C9010.
9.2(1.0) Introduced on the Z9500.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
6.5.1.0 Introduced on the E-Series.
Usage Information By default, the system implements an optimized flush mechanism for RSTP. This implementation helps in flushing
MAC addresses only when necessary (and less often), allowing for faster convergence during topology changes.
However, if a standards-based flush mechanism is needed, you can turn on this knob command to enable flushing
MAC addresses after receiving every topology change notification.
1356 Rapid Spanning Tree Protocol (RSTP)