Dell Force10 Z9000 FTOS Command Line Reference Guide for the Z9000 System FTOS - Page 1176

Command History Usage Information Related Commands Version 8.3.11.1 Version 8.3.7.0 Version 8.2.1.0 Introduced on the Z9000. Introduced on the S4810. Introduced. 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 the Error-Disable state. This behavior might result in the network not converging. To prevent FTOS from executing this action, use the no spanning-tree pvst err-disable command cause invalid-pvst-bpdu. show spanning-tree pvst - views the PVST+ configuration. tc-flush-standard Enable the MAC address flushing after receiving every topology change notification. C-Series, E-Series, S-Series, Z-Series, S4810 Syntax Defaults Command Modes Command History tc-flush-standard To disable, use the no tc-flush-standard command. Disabled. CONFIGURATION Version 8.3.11.1 Version 8.3.7.0 Version 7.6.1.0 Version 7.5.1.0 Version 6.5.1.0 Introduced on the Z9000. Introduced on the S4810. Introduced on the S-Series. Introduced on the C-Series. Introduced. 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, you can turn this knob command on to enable flushing MAC addresses after receiving every topology change notification. 1176