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xStack
®
DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch
Loopback Detection
This feature is used to temporarily shutdown a port on the Switch when a BPDU packet has
been looped back to the switch. When the Switch detects its own BPDU packet coming
back, it signifies a loop on the network. STP will automatically be blocked and an alert will be
sent to the administrator. The LBD STP port will restart (change to discarding state) when
the LBD Recover Time times out. The Loopback Detection function will only be implemented
on one port at a time. The user may enable or disable this function using the pull-down
menu. The default is Enabled.
LBD Recover Time
This field will set the time the STP port will wait before recovering the STP state set. 0 will
denote that the LBD will never time out or restart until the administrator personally changes
it. The user may also set a time between
60
and
1000000
seconds. The default is
60
seconds.
NOTE:
The Loopback Detection function can only be implemented on the Switch if it is configured
both on the
STP Global Settings
window, and on the
STP Port Settings
window. Enabling this
feature through only one of these windows will not fully enable the Loopback Detection function.
Click
Apply
to implement changes made.
MST Configuration Identification
The
MST Configuration Identification
window allows the user to configure a MSTI instance on the Switch. These settings will
uniquely identify a multiple spanning tree instance set on the Switch. The Switch initially possesses one
CIST or Common
Internal Spanning Tree of which the user may modify the parameters for but cannot change the MSTI ID for, and cannot be
deleted.
To view this window, click
L2 Features > Spanning Tree > MST Configuration Identification
, as shown below.
Figure 7- 42. MST Configuration Identification and Settings window
The window above contains the following information:
Parameter Description
Configuration Name
A previously configured name set on the Switch to uniquely identify the MSTI (Multiple
Spanning Tree Instance). If a configuration name is not set, this field will show the MAC
address to the device running MSTP. This field can be set in the STP Bridge Global Settings
window.
Revision Level (0-
This value, along with the Configuration Name will identify the MSTP region configured on
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