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DES-3550 Fast Ethernet Layer 2 Switch

GVRP Setting

In the Configuration menu, open the VLANs folder and click GVRP Setting.

The 802.1Q Port Settings dialog box, shown below, 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 6- 39. 802.1Q Port Settings window

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.

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 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 changes made.