Patton electronic 07M2160-GS, 2160 Series manual 802.1Q Vlan

Model 2160 Series Getting Started Guide 4 • Web configuration

•Tag Protocol Identifier (TPID) is a defined value of 8100 in hex. When a frame has the EtherType equal to 8100, this frame carries the tag IEEE 802.1Q / 802.1P.

•User Priority defines the priority level for different classes of traffic. There are 8 possible priority levels, with 0 being the lowest priority level and 7 being the highest level. IEEE 802.1P defines the operation for these 3 user priority bits.

•Canonical Format Indicator (CFI) is always set to zero for Ethernet switches. CFI is used for compatibility reasons between an Ethernet-type network and Token Ring-type network. If a frame received at an Ethernet port has a CFI set to 1, then that frame should not be forwarded as it is to an untagged port.

•VLAN ID (VID) is the unique identification number of the VLAN, which is used by the standard 802.1Q. It has 12 bits and allows the identification of 4096 (212) VLANs. Of the 4096 possible VIDs, a VID of 0 is used to identify priority frames and the value 4095 (FFF) is reserved, so the maximum possible VLAN con- figurations are 4,094.

The Model 2160 initially configures one VLAN by default, VID=1. A port such as LAN1–4, line or sniffing can have only one Port VID (PVID), but can have as many VID groups as the Model 2160 has memory in its VLAN table to store them.

Ports in the same VLAN group share the same frame broadcast domin thus increase network performance through reduced boardcast traffic. You can modify VLAN groups at any time by adding, moving or changing ports without any re-cabling.

SERVER

802.1Q VLAN

LAN1

LAN2 STU-C

		1	2	3	4		CopperLink™2160
		WAN				LINK	Long Range Ethernet Extender
						LINK/ACT
PWR ALM	DIAG	LAN				100M

LAN1

STU-R LAN2

	1	2	3	4		CopperLink™2160
	WAN				LINK	Long Range Ethernet Extender
					LINK/ACT
PWR ALM DIAG	LAN				100M

	CopperLink Model 2160
LAN3	Extender connection
	LAN3

SERVER

1	2	3	LAN4
4	5	6
7	8	9
*	0	#

VOIP

LAN4	1	2	3
	4	5	6
	7	8	9
	*	0	#

VOIP

Figure 18. 802.1Q VLAN diagram

Configuring 802.1Q VLAN Tagging. Before enabling VLANs for the Model 2160, you must first assign each port to the VLAN group(s) in which it will participate. By default all ports are assigned to VLAN1 as untagged ports. Add a port as a tagged port if you want it to carry traffic for one or more VLANs, and any intermediate network devices or the host at the other end of the connection supports VLANs. Then, assign ports on the other VLAN-aware network devices along the path that will carry this traffic to the same VLAN(s), either man-

Advanced Configuration Options 45