User`s manual

Configuring the Spanning Tree Protocol
Command Line
The Switch implements the IEEE Spanning Tree Protocol to detect and preserve an active bridged local area
network topology.
Spanning Tree blocks certain ports to prevent bandwidth-sapping traffic loops while preserving
fault tolerance by maintaining a redundant bridge path as backup. If the first bridge path should fail, the
secondary bridge path takes over.
Entering port numbers
You can enter a single number, multiple individual numbers or a range of numbers in the <port_number>
field.
●
Use a dash to separate numbers in a range.●
Use commas to separate individual numbers or more than one range of numbers.●
For example: 1-3,5,9,12-15.●
Configuration steps
Enable the Spanning Tree Protocol on the Switch by entering:
>set spantree enable
1.
Enable the Spanning Tree Protocol on a single port, selected ports or a range of ports by typing:
>set span enable <port_number>
If you set enable, the port immediately enters the blocking state and the Switch determines whether it will
block data or continue forwarding it. If you leave the port disabled, the default, the port continues to
forward and transmit data without delay as part of the spanning tree.
Enable ports whose links connect to
other parts of the bridged local area network where multiple, redundant paths back to the root bridge
might exist.
Disable Switch ports with directly connected end stations so that the Spanning Tree Protocol
does not delay the end station's ability to connect to various network services.
2.
Set forwarding delay by typing:
>set spantree fwddelay <delay>
fwddelay is the amount of time the spanning tree algorithm spends in each intermediate port state during
a transition from blocking to forwarding. The default is 15 seconds. This value is also used as a short
aging time value for all dynamic MAC entries in the address tables, during a topology change of the active
bridged local area network, as specified by the root bridge.
<delay>can range from 4-30 seconds
3.
Set hello response time by typing:
>set spantree hello <interval>
hello is the hello time interval between issuing configuration Bridge Protocol Data Units (BPDU).
Bridges
(switches) use BPDUs to calculate the spanning tree. <interval> can range from 1-10 seconds. It is
usually sufficient to use a whole number.
4.
Set maximum aging time by typing:
>set spantree maxage <agingtime>
max Age is the time period after which received protocol information is discarded. The Switch stores
received and calculated BPDU parameters in memory. The stored configuration information for each port
is discarded if no update activity has occurred when this limit is reached.
5.
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