DES-3550 Layer 2 Fast Ethernet Switch User’s Guide
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The following fields can be set:
Parameter Description
From/To
These two fields allow you to specify the range of ports that will be included
in the Port-based VLAN that you are creating using the
802.1Q Port
Settings page.
PVID
The read only field in the
GVRP Table
shows the current PVID assignment
for each port. The Switch’s default is to assign all ports to the Default VLAN
with a VID of 1.
The PVID is used by the port to tag outgoing, untagged packets, and to
make filtering decisions about incoming packets. If the port is specified to
accept only tagged frames as tagging, and an untagged packet is forwarded
to the port for transmission, the port will add an 802.1Q tag using the PVID to
write the VID in the tag. When the packet arrives at its destination, the
receiving device will use the PVID to make VLAN forwarding decisions.
If a packet is received by the port, and Ingress filtering is enabled, the port
will compare the VID of the incoming packet to its PVID. If the two are
unequal, the port will drop the packet. If the two are equal, the port will
receive the packet.
GVRP
The Group VLAN Registration Protocol (GVRP) enables the port to
dynamically become a member of a VLAN.
GVRP
is disabled by default.
Ingress
This field can be toggled using the space bar between Enabled and
Disabled.
Enabled enables the port to compare the VID tag of an incoming
packet with the PVID number assigned to the port. If the two are different,
the port filters (drops) the packet. Disabled disables Ingress filtering. Ingress
Checking is disabled by default.
Acceptable Frame
Type
This field denotes the type of frame that will be accepted by the port. The
user may choose between
Tagged Only,
which means only VLAN tagged
frames will be accepted, and
Admit_All,
which means
both tagged and
untagged frames will be accepted. Admit_All is enabled by default.
Click Apply to implement the changes made.
Port Bandwidth
The bandwidth control settings are used to place a ceiling on the transmitting and receiving
data rates for any selected port. In the Configuration folder, click Port Bandwidth, to view
the screen shown below.
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