Dell Force10 S4810P, Reference Manual

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attack. This option places the port into an Error Disable state if a BPDU appears and a message
is logged so that the administrator can take corrective action.
NOTE: A port configured as an edge port, on an RSTP switch, immediately transitions to
the Forwarding state. You should only configure ports connected to end-hosts as edge
ports. Consider an edge port similar to a port with a
spanning-tree portfast
enabled.
If you do not enable
shutdown-on-violation
, BPDUs are still sent to the RPM CPU.
You cannot enable STP root guard and loop guard 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 displays:
% Error: RootGuard is configured. Cannot
configure LoopGuard
.
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.
Example
FTOS(conf)#interface gigabitethernet 4/0
FTOS(conf-if-gi-4/0)#spanning-tree rstp edge-port
FTOS(conf-if-gi-4/0)#show config
!
interface GigabitEthernet 4/0
no ip address
switchport
spanning-tree rstp edge-port
no shutdown
FTOS#
tc-flush-standard
Enable the MAC address flushing after receiving every topology change notification.
C-Series, E-Series, S-Series, Z-Series, S4810
Syntax tc-flush-standard
To disable, use the
no tc-flush-standard
command.
Defaults Disabled
Command Modes CONFIGURATION
Command History
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Version 7.6.1.0 Introduced on the S-Series.
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