Users Guide

Conguring an EdgePort
The EdgePort feature enables interfaces to begin forwarding trac approximately 30 seconds sooner.
In this mode, an interface forwards frames by default until it receives a BPDU that indicates that it should behave otherwise; it does
not go through the Learning and Listening states. The
bpduguard shutdown-on-violation option causes the interface
hardware to shut down when it receives a BPDU. When you implement only
bpduguard, although the interface is placed in an Error
Disabled state when receiving the BPDU, the physical interface remains up and spanning-tree drops packets in the hardware after a
BPDU violation. BPDUs are dropped in the software after receiving the BPDU violation. This feature is the same as PortFast mode in
spanning tree.
CAUTION: Congure EdgePort only on links connecting to an end station. EdgePort can cause loops if you enable it on
an interface connected to a network.
To enable EdgePort on an interface, use the following command.
• Enable EdgePort on an interface.
INTERFACE mode
spanning-tree mstp edge-port [bpduguard | shutdown-on-violation]
Dell Networking OS Behavior: Regarding bpduguard shutdown-on-violation behavior:
– If the interface to shut down is a port channel, all the member ports are disabled in the hardware.
– When you add a physical port to a port channel already in the Error Disable state, the new member port is also disabled in the
hardware.
– When you remove a physical port from a port channel in the Error Disable state, the error disabled state is cleared on this
physical port (the physical port is enabled in the hardware).
– You can clear the Error Disabled state with any of the following methods:
* Use the shutdown command on the interface.
* Disable the shutdown-on-violation command on the interface (using the no spanning-tree stp-id
portfast [bpduguard | [shutdown-on-violation]]
command).
* Disable spanning tree on the interface (using the no spanning-tree command in INTERFACE mode).
* Disabling global spanning tree (using the no spanning-tree command in CONFIGURATION mode).
Example of Enabling an EdgePort on an Interface
To verify that EdgePort is enabled, use the show config command from INTERFACE mode.
Dell(conf-if-Te-3/41)#spanning-tree mstp edge-port
Dell(conf-if-Te-3/41)#show config
!
interface TenGigabitEthernet 3/41
no ip address
switchport
spanning-tree mstp edge-port
spanning-tree MSTI 1 priority 144
no shutdown
Dell(conf-if-Te-3/41)#
Conguring Fast Hellos for Link State Detection
Use RSTP fast hellos to achieve sub-second link-down detection so that convergence is triggered faster. The standard RSTP link-
state detection mechanism does not oer the same low link-state detection speed.
To achieve sub-second link-down detection so that convergence is triggered faster, use RSTP fast hellos. The standard RSTP link-
state detection mechanism does not oer the same low link-state detection speed.
RSTP fast hellos decrease the hello interval to the order of milliseconds and all timers derived from the hello timer are adjusted
accordingly. This feature does not inter-operate with other vendors, and is available only for RSTP.
Multiple Spanning Tree Protocol (MSTP)
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