Command Line Reference Guide

message is displayed: % Error: RootGuard is configured. Cannot
configure LoopGuard.
When used in an MSTP network, if root guard blocks a boundary port in the CIST, the port is
also blocked in all other MST instances.
Enabling Portfast BPDU guard and loop guard at the same time on a port results in a port that
remains in a blocking state and prevents traffic from flowing through it. For example, when
Portfast BPDU guard and loop guard are both configured:
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.
tc-flush-standard
Enable the MAC address flushing after receiving every topology change notification.
S5000
Syntax
tc-flush-standard
To disable, use the no tc-flush-standard command.
Defaults Disabled.
Command Modes CONFIGURATION
Command History
Version 9.0(1.3) Introduced on the S5000.
Usage
Information
By default, FTOS implements an optimized flush mechanism for MSTP. 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 after receiving every
topology change notification.
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