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DES-3550 Fast Ethernet Layer 2 Switch
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.
Traffic Control
Use the Traffic Control menu to enable or disable storm control and adjust the threshold for multicast and broadcast
storms, as well as DLF (Destination Look Up Failure). Traffic control settings are applied to individual Switch modules.
To view the following window, click Configuration > VLANs > Traffic Control:
Figure 6- 40. Traffic Control Settings and Traffic Control Table window
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