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DES-2218 Ethernet Switch User’s Guide
Using the Console Interface
47
♦ Forward Delay (sec) Indicates how fast any port on the DES-2218
can change its spanning state when moving towards the forwarding
state. This value determines how long the port stays in each of the
listening and learning states, which precede the forwarding state.
♦ Bridge Max Age When the value you set for this parameter expires,
and the DES-2218 still has not received a BPDU from the root bridge,
it will start sending its own BPDU to all other bridges for permission
to become the root bridge. If it turns out that the DES-2218 has the
lowest bridge identifier, it will then become the root bridge. Bridge
Max Age ranges from 6 to 40 seconds, with 20 seconds as the default
value.
♦ Bridge Hello Time This is the interval between two consecutive
transmissions of BPDU packets sent by the root bridge to inform all
other bridges that it is indeed the root bridge. If you set a Bridge
Hello Time for a bridge that is not the root bridge, the setting will be
used if and when this bridge becomes the root bridge. Bridge Hello
Time ranges from 1 to 10 seconds, with 2 seconds as default.
♦ Bridge Forward Delay. Bridge Forward Delay ranges from 4 to 30
seconds. This is the time any port on the DES-2218 spends in the
“listening state” while moving from “blocking state” to “forwarding
state”.
Use the following formulas when setting this parameter:
Bridge Max Age ≥ 2 · (Bridge Hello Time + 1 second)
Bridge Max Age ≤ 2 · (Bridge Forward Delay - 1 second)
♦ Bridge Priority This parameter sets the priority number of the
system. Valid value ranges from 0 to 65535, with 0 being the highest
bridge priority. Default value is 32768.
To set the STP port parameters for the switch,
1. Choose Spanning Tree Algorithm Parameters from the main menu.