Service Manual
Dell Networking systems do not expect PVST+ BPDU on an untagged port. If this happens, Dell Networking OS
places the port in the Error-Disable state. This behavior might result in the network not converging. To prevent Dell
Networking OS from executing this action, use the no spanning-tree pvst err-disable command
cause invalid-pvst-bpdu.
Related Commands
• show spanning-tree pvst — views the PVST+ conguration.
tc-ush-standard
Enable the MAC address ushing after receiving every topology change notication.
S4048
Syntax
tc-flush-standard
To disable, use the no tc-flush-standard command.
Defaults Disabled.
Command Modes CONFIGURATION
Command History
This guide is platform-specic. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
Version Description
9.8(1.0) Introduced on the Z9100-ON.
9.8(0.0) Introduced on the S3048-ON and S4048-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.
8.3.7.0 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.
Usage Information By default, Dell Networking OS implements an optimized ush mechanism for PVST+. This implementation helps in
ushing the MAC addresses only when necessary (and less often) allowing for faster convergence during topology
changes. However, if a standards-based ush mechanism is needed, you can turn this knob command on to enable
ushing MAC addresses after receiving every topology change notication.
Per-VLAN Spanning Tree Plus (PVST+) 1259