Users Guide

Version Description
8.2.1.0 Introduced.
Usage Information
Some non-Dell Networking systems which have hybrid ports participating in PVST+ transmit two kinds of
BPDUs: an 802.1D BPDU and an untagged PVST+ BPDU.
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+ configuration.
tc-flush-standard
Enable the MAC address flushing after receiving every topology change notification.
S4820T
Syntax
tc-flush-standard
To disable, use the no tc-flush-standard command.
Defaults Disabled.
Command Modes CONFIGURATION
Command History
This guide is platform-specific. 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.
9.7(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 flush mechanism for PVST+. This
implementation helps in flushing the MAC addresses only when necessary (and less often) allowing for
faster convergence during topology changes. However, if a standards-based flush mechanism is needed,
Per-VLAN Spanning Tree Plus (PVST+) 1288