DES-3028 DES-3028P DES-3052 DES-3052P Layer 2 Fast Ethernet Managed Switch
STP Bridge Global Settings
To open the following window, open Spanning Tree in the L2 features folder and click the STP Bridge Global Settings link.
Figure 7- 16. STP Bridge Global Settings window
The following parameters can be set:
Parameter Description
Spanning Tree Protocol
Use the pull-down menu to enable or disable STP globally on the Switch. The
default is Disabled.
Bridge Max Age (6 - 40
Sec)
The Max Age may be set to ensure that old information does not endlessly
circulate through redundant paths in the network, preventing the effective
propagation of the new information. Set by the Root Bridge, this value will aid in
determining that the Switch has spanning tree configuration values consistent with
other devices on the bridged LAN. If the value ages out and a BPDU has still not
been received from the Root Bridge, the Switch will start sending its own BPDU to
all other switches for permission to become the Root Bridge. If it turns out that
your switch has the lowest Bridge Identifier, it will become the Root Bridge. The
user may choose a time between 6 and 40 seconds. The default value is 20.
Bridge Hello Time (1 - 10
Sec)
The Hello Time can be set from 1 to 10 seconds. This is the interval between two
transmissions of BPDU packets sent by the Root Bridge to tell all other switches
that it is indeed the Root Bridge.
Bridge Forward Delay (4
- 30 Sec)
The Forward Delay can be from 4 to 30 seconds. Any port on the Switch spends
this time in the listening state while moving from the blocking state to the for-
warding state.
Max Hops (1-20)
Used to set the number of hops between devices in a spanning tree region before
the BPDU (bridge protocol data unit) packet sent by the Switch will be discarded.
Each switch on the hop count will reduce the hop count by one until the value
reaches zero. The Switch will then discard the BPDU packet and the information
held for the port will age out. The user may set a hop count from 1 to 20. The
default is 20.
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