Edge-Core ES3528MV2 Management Manual page 251

An interface cannot function as an edge port under the following
conditions:
If spanning tree mode is set to STP
■
cannot automatically transition to operational edge-port state using
the automatic setting.
If loopback detection is enabled
■
detected, the interface cannot function as an edge port until the
loopback state is released.
If an interface is in forwarding state and its role changes, the
■
interface cannot continue to function as an edge port even if the
edge delay time has expired.
If the port does not receive any BPDUs after the edge delay timer
■
expires, its role changes to designated port and it immediately
enters forwarding state (see
on page 252).
BPDU Guard – This feature protects edge ports from receiving BPDUs.
◆
It prevents loops by shutting down an edge port when a BPDU is
received instead of putting it into the spanning tree discarding state. In
a valid configuration, configured edge ports should not receive BPDUs.
If an edge port receives a BPDU an invalid configuration exists, such as
a connection to an unauthorized device. The BPDU guard feature
provides a secure response to invalid configurations because an
administrator must manually enable the port. (Default: Disabled)
BPDU Filter – BPDU filtering allows you to avoid transmitting BPDUs
◆
on configured edge ports that are connected to end nodes. By default,
STA sends BPDUs to all ports regardless of whether administrative edge
is enabled on a port. BDPU filtering is configured on a per-port basis.
(Default: Disabled)
Migration – If at any time the switch detects STP BPDUs, including
◆
Configuration or Topology Change Notification BPDUs, it will
automatically set the selected interface to forced STP-compatible
mode. However, you can also use the Protocol Migration button to
manually re-check the appropriate BPDU format (RSTP or STP-
compatible) to send on the selected interfaces. (Default: Disabled)
W I
EB NTERFACE
To configure interface settings for STA:
Click Spanning Tree, STA.
1.
Select Configure Interface from the Step list.
2.
Select Configure from the Action list.
3.
Modify any of the required attributes.
4.
Click Apply.
5.
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| Spanning Tree Algorithm
C 8
HAPTER
Configuring Interface Settings for STA
(page 242), edge-port mode
(page 240) and a loopback BPDU is
"Displaying Interface Settings for STA"