Reference Guide

1168 | Per-VLAN Spanning Tree Plus (PVST+)
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Command
History
Usage
Information
Some non-Dell Force10 systems which have hybrid ports participating in PVST+ transmit
two kinds of BPDUs: an 802.1D BPDU and an untagged PVST+ BPDU.
Dell Force10 systems do not expect PVST+ BPDU on an untagged port. If this happens,
FTOS places the port in error-disable state. This behavior might result in the network not
converging. To prevent FTOS from executing this action, use the command
no spanning-tree
pvst err-disable cause invalid-pvst-bpdu
.
Related
Commands
tc-flush-standard
c e s
Enable the MAC address flushing upon receiving every topology change notification.
Syntax
tc-flush-standard
To disable, use the
no tc-flush-standard command.
Defaults
Disabled
Command Modes
CONFIGURATION
Command
History
Usage
Information
By default FTOS implements an optimized flush mechanism for PVST+. This 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, this knob command can be turned on to enable flushing MAC addresses upon
receiving every topology change notification.
vlan bridge-priority
c e s
Set the PVST+ bridge-priority for a VLAN or a set of VLANs.
Version 8.3.7.0 Introduced on S4810
Version 8.2.1.0 Introduced
show spanning-tree pvst View the PVST+ configuration.
Version 8.3.7.0 Introduced on S4810
Version 7.6.1.0 Support added for S-Series
Version 7.5.1.0 Support added for C-Series
Version 6.5.1.0 Introduced