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P
ARAMETERS
These parameters are displayed in the web interface:
•
Interface – Displays a list of ports or trunks.
•
Admin Edge Status for all ports – Since end nodes cannot cause forwarding
loops, they can pass directly through to the spanning tree forwarding state.
Specifying Edge Ports provides quicker convergence for devices such as
workstations or servers, retains the current forwarding database to reduce the
amount of frame flooding required to rebuild address tables during reconfiguration
events, does not cause the spanning tree to initiate reconfiguration when the
interface changes state, and also overcomes other STA-related timeout problems.
However, remember that Edge Port should only be enabled for ports connected to
an end-node device. (Default: Enabled)
•
Enabled – Manually configures a port as an Edge Port.
•
Disabled – Disables the Edge Port setting.
•
Auto – The port will be automatically configured as an edge port if the edge
delay time expires without receiving any RSTP or MSTP BPDUs. Note that
edge delay time (802.1D-2004 17.20.4) equals the protocol migration time if a
port's link type is point-to-point (which is 3 seconds as defined in IEEE
802.3D-2004 17.20.4); otherwise it equals the spanning tree's maximum age for
configuration messages (see maximum age under
Global Settings for STA" on page
An interface cannot function as an edge port under the following conditions:
•
If spanning tree mode is set to STP
automatically transition to operational edge-port state using the automatic
setting.
•
If loopback detection is enabled
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
Section 9-5: "Displaying Interface Settings for STA" on page
•
Spanning Tree – Enables/disables STA on this interface. (Default: Enabled)
•
Priority – Defines the priority used for this port in the Spanning Tree Protocol. If the
path cost for all ports on a switch are the same, the port with the highest priority (i.e.,
lowest value) will be configured as an active link in the Spanning Tree. This makes a
port with higher priority less likely to be blocked if the Spanning Tree Protocol is
detecting network loops. Where more than one port is assigned the highest priority,
the port with lowest numeric identifier will be enabled.
•
Default: 128
Chapter 9: Spanning Tree Algorithm
9-5).
(page
9-5), edge-port mode cannot
(page
9-4) and a loopback BPDU is detected,
9-13
Section 9-3: "Configuring
9-16).
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