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DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide
162
Click the Apply button to accept the changes made.
The fields that can be configured for STP Configuration are described below:
Parameter Description
Bridge Max Age
Enter the bridge Maximum Age value here. This value must be between 6 and 40
seconds. By default, this value is 20 seconds. The Maximum Age value 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.
Bridge Hello Time After selecting RSTP/STP as the Spanning Tree Mode, this parameter will be
available. Enter the bridge Hello Time value here. This value must be between 1
and 2 seconds. By default, this value is 2 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. This field will only appear here when STP or
RSTP is selected for the STP version. For MSTP, the Hello Time must be set on a
port per-port basis.
Bridge Forward Time
Enter the bridge Forwarding Time value here. This value must be between 4 and
30 seconds. By default, this value is 15 seconds. Every port on the Switch spends
this time in the Listening state while moving from the Blocking state to the
Forwarding state.
TX Hold Count
Enter the Transmit Hold Count value here. This value must be between 1 and 10
times. By default, this value is 6 times. This value is used to set the maximum
number of Hello packets transmitted per interval.
Max Hops
Enter the maximum number of hops that are allowed. This value must be between
1 and 40 hops. By default, this value is 20 hops. This value is used to set the
number of hops between devices in a spanning tree region before the Bridge
Protocol Data Unit (BPDU) 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 BDPU packet and the information held for
the port will age out.
NNI BPDU Address Select the NNI BPDU Address option here. Options to choose from are Dot1d and
Dot1ad. This parameter is used to determine the BPDU protocol address for STP
in the service provider network. It can use an 802.1d STP address and an 802.1ad
service provider STP address. By default, the Dot1d option is used.
Click the Apply button to accept the changes made.
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