3Com SuperStack II Switch 3000 10/100 User Manual page 52

4-10 C 4: M
HAPTER ANAGING THE
VLAN Configuration Mode Port / AutoSelect This
field allows you to specify how ports on the Switch
are placed in VLANs:
Port — The ports use Port VLAN Mode, which
means that they are manually placed in the
required VLAN. This is the default mode.
AutoSelect — The ports use AutoSelect VLAN
Mode, which means that they are automatically
placed in the required VLAN by referring to a
VLAN Server database in 3Com's Transcend
Enterprise Manager software.
For more information, refer to
VLAN Mode" on page
SDB Ageing Time This field allows you to specify
the ageing time (hours:minutes) for all non-perma-
nent entries in the Switch Database of the unit.
You can set an ageing time in the range 0 minutes
to 277 hours, with a default of 30 minutes. If you
enter 0:00, ageing will be turned off. For more
information about ageing times, refer to
Up the Switch Database (SDB)"
Spanning Tree Enable / Disable This field allows
you to enable or disable the Spanning Tree Protocol
(STP) on the Switch. For more information about
STP, refer to "Spanning Tree Protocol"
5-11.
S 3000 10/100
WITCH
®
"Using AutoSelect
5-4.
"Setting
on page 4-17.
on page
Speed/Duplex Mode Auto Negotiated / 10Mbps
Half Duplex / 10Mbps Full Duplex / 100Mbps Half
Duplex / 100Mbps Full Duplex
This field allows you to specify the speed and
Duplex Mode of ports which have Unit Default spec-
ified in the Speed/Duplex Mode field of the Port
Setup screen.
If the Speed/Duplex Mode field to set to Auto Nego-
tiated, the speed and Duplex Mode of each link to
the Switch is automatically detected, and the speed
and Duplex Mode of each port is set accordingly.
The default setting is Auto Negotiated.
CAUTION: The Duplex Mode of a link is not
detected if:
The Switch 3000 10/100 port is a Plug-in Module
port
The port on the other end of the link is not
auto-negotiating
In these cases, the Switch 3000 10/100 port is set
to operate in half duplex. If the port on the other
end of the link is set to operate in full duplex, this
creates a large number of late events on the link.
Therefore:
If you want the link to operate in full duplex, set
the Switch 3000 10/100 port to operate in full
duplex
If you want the link to operate in half duplex, set
the port on the other end of the link to half
duplex