Dell Force10 MXL Blade - Interface Tengigabitethernet 4;0

528 | Rapid Spanning Tree Protocol (RSTP)
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Usage
Information
The BPDU guard option prevents the port from participating in an active STP topology in case a
BPDU appears on a port unintentionally, or is mis-configured, or is subject to a DOS 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.
If you do not enable the
shutdown-on-violation command, BPDUs are still sent to the 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
is displayed:
% 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
Figure 28-7. spanning-tree rstp edge-port Command Example
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
Note: A port configured as an edge port on an RSTP switch, immediately transitions to the
Forwarding state. Only ports connected to end-hosts should be configured as edge ports.
Consider an edge port similar to a port with a spanning-tree portfast enabled.
FTOS(conf)#interface tengigabitethernet 4/0
FTOS(conf-if-tengig-4/0)#spanning-tree rstp edge-port
FTOS(conf-if-tengig-4/0)#show config
!
interface TenGigabitEthernet 4/0
no ip address
switchport
spanning-tree rstp edge-port
no shutdown
FTOS#
Version 8.3.16.1 Introduced on MXL 10/40GbE Switch IO Module