Chapter 4: Web configuration
NS3552-8P-2S-V2 User Manual 135
The following are the user-configurable STP parameters for the switch level:
Parameter Description Default Value
Bridge Identifier (Not
user configurable
except by setting
priority below)
A combination of the user-set priority and the switch’s
MAC address.
The Bridge Identifier consists of two parts: A 16-bit
priority and a 48-bit Ethernet MAC address 32768 +
MAC.
32768 + MAC
Priority A relative priority for each switch – lower numbers give a
higher priority and a greater chance of a given switch
being elected as the root bridge
32768
Hello Time The length of time between broadcasts of the hello
message by the switch
2 seconds
Maximum Age Timer Measures the age of a received BPDU for a port and
ensures that the BPDU is discarded when its age
exceeds the value of the maximum age timer.
20 seconds
Forward Delay Timer The amount of time spent by a port in the learning and
listening states waiting for a BPDU that may return the
port to the blocking state.
15 seconds
The following are the user-configurable STP parameters for the port or port group level:
Variable Description Default Value
Port Priority A relative priority for each port – lower
numbers give a higher priority and a
greater chance of a given port being
elected as the root port
128
Port Cost A value used by STP to evaluate paths –
STP calculates path costs and selects the
path with the minimum cost as the active
path
200,000-100Mbps Fast Ethernet ports
20,000-1000Mbps Gigabit Ethernet ports
0 - Auto
Default spanning-tree configuration
Feature Default Value
Enable state STP disabled for all ports
Port priority 128
Port cost 0
Bridge Priority 32,768
User-changeable STA parameters
The factory default settings for the switch should cover the majority of installations. It is
advisable to keep the default settings as set at the factory unless it is absolutely
necessary. The user changeable parameters in the switch are as follows:
• Priority – A priority for the switch can be set from 0 to 65535. 0 is equal to the
highest priority.
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