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DES-3550 Fast Ethernet Layer 2 Switch
NOTE: The Hello Time cannot be longer than the Max. Age. Otherwise, a
configuration error will occur. Observe the following formulas when setting
the above parameters:
Max. Age = 2 x (Forward Delay - 1 second)
Max. Age = 2 x (Hello Time + 1 second)
MST Configuration Table
The following screens in the MST Configuration Table window allow 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 the Current MST Configuration Identification window, click
Configuration > Spanning Tree > MST Configuration Table:
Figure 6- 21. Current MST Configuration Identification 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
This value, along with the Configuration Name will identify the MSTP region con-
figured on the Switch. This field can also be set in the STP Bridge Global Settings
window.
MSTI ID
This field shows the MSTI IDs currently set on the Switch. This field will always have
the CIST MSTI, which may be configured but not deleted. Clicking the hyperlinked
name will open a new window for configuring parameters associated with that
particular MSTI.
VID List
This field displays the VLAN IDs associated with the specific MSTI.
Clicking the Add button will reveal the following window to configure:
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