DES-3028 DES-3028P DES-3052 DES-3052P Layer 2 Fast Ethernet Managed Switch
GVRP Settings
In the L2 Features folder, open the VLAN folder and click GVRP Settings. The GVRP Settings window, shown left, allows
you to determine whether the Switch will share its VLAN configuration information with other GARP VLAN Registration
Protocol (GVRP) enabled switches. In addition, Ingress Checking can be used to limit traffic by filtering incoming packets whose
PVID does not match the PVID of the port. Results can be seen in the table under the configuration settings, as seen below.
Figure 7- 7. GVRP Settings window
default is to
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 window.
GVRP
The Group VLAN Registration Protocol
(GVRP) enables the port to dynamically
become a member of a VLAN. GVRP is
Disabled by default.
Ingress
Check
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.
PVID
The read-only field in the 802.1Q Port
Table shows the current PVID assignment
for each port, which may be manually
assigned to a VLAN when created in the
802.1Q Port Settings table. The Switch's
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 the port receives a packet, 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.
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 mean both
tagged and untagged frames will be
accepted. Admit_All is enabled by default.
Click Apply to implement changes made.
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