Digisol DG-FS4528P, Management Manual

Page: 752 / 973

C
HAPTER
36 | Spanning Tree Commands
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If the “auto” option is used, the port will be automatically configured as
an edge port if the port state has transitioned from discarding to
forwarding, and 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; otherwise it equals the spanning-tree’s maximum age
( page 740 ).
An interface cannot function as an edge port under the following
conditions:
If spanning tree mode is set to STP ( page 740 ), edge-port mode
can be manually enabled or set to auto, but will have no effect.
If loopback detection is enabled ( page 753 ) and a loopback BPDU is
detected, the interface cannot function as an edge port until the
loopback state is released ( page 753 ).
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 "Displaying Interface Settings for
STA" ).
The edge delay time equals the protocol migration time when the
port link type is point-to-point (which is 3 seconds as defined in
IEEE 802.3D-2004 17.20.4), otherwise it equals the maximum age
for configuration messages (see the spanning-tree max-age
command).
E
XAMPLE
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree edge-port
Console(config-if)#
spanning-tree link-
type
This command configures the link type for Rapid Spanning Tree and
Multiple Spanning Tree. Use the no form to restore the default.
S
YNTAX
spanning-tree link-type { auto | point-to-point | shared }
no spanning-tree link-type
auto - Automatically derived from the duplex mode setting.
point-to-point - Point-to-point link.
shared - Shared medium.
D
EFAULT
S
ETTING
auto