Service Manual

shutdown-on-
violation
(OPTIONAL) Enter the keywords shutdown-on-violation to hardware disable an
interface when a BPDU is received and the port is disabled.
rootguard Enter the keyword rootguard to enable root guard on an MSTP port or port-channel
interface.
Command Modes INTERFACE
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information
On an MSTP switch, a port configured as an edge port immediately transitions to the forwarding state. Only ports
connected to end-hosts should be configured as an edge port. Consider an edge port similar to a port with
spanning-tree portfast enabled.
Root guard and loop guard cannot be enabled at the same time on a port. For example, if you configure loop guard
on a port on which root guard is already configured, the following error 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.
Syntax
tc-flush-standard
To disable, use the no tc-flush-standard command.
Defaults Disabled.
Command Modes CONFIGURATION
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information By default, the sytem implements an optimized flush mechanism for MSTP. This mechanism 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.
Multiple Spanning Tree Protocol (MSTP) 829