D-Link DGS-3200-16 User Manual - Page 71
Port-based VLANs, VLAN Segmentation, VLAN and Trunk Groups, VLAN Name, Switch Ports - 10 e
UPC - 790069312007
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xStack® DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch VLAN Name VID Switch Ports System (default) 1 5, 6, 7 Engineering 2 9, 10 Sales 5 1, 2, 3, 4 Port-based VLANs Table 3 - 1. VLAN Example - Assigned Ports Port-based VLANs limit traffic that flows into and out of switch ports. Thus, all devices connected to a port are members of the VLAN(s) the port belongs to, whether there is a single computer directly connected to a switch, or an entire department. On port-based VLANs, NICs do not need to be able to identify 802.1Q tags in packet headers. NICs send and receive normal Ethernet packets. If the packet's destination lies on the same segment, communications take place using normal Ethernet protocols. Even though this is always the case, when the destination for a packet lies on another switch port, VLAN considerations come into play to decide if the packet gets dropped by the Switch or delivered. VLAN Segmentation Take for example a packet that is transmitted by a machine on Port 1 that is a member of VLAN 2. If the destination lies on another port (found through a normal forwarding table lookup), the Switch then looks to see if the other port (Port 10) is a member of VLAN 2 (and can therefore receive VLAN 2 packets). If Port 10 is not a member of VLAN 2, then the packet will be dropped by the Switch and will not reach its destination. If Port 10 is a member of VLAN 2, the packet will go through. This selective forwarding feature based on VLAN criteria is how VLANs segment networks. The key point being that Port 1 will only transmit on VLAN 2. VLAN and Trunk Groups The members of a trunk group have the same VLAN setting. Any VLAN setting on the members of a trunk group will apply to the other member ports. NOTE: In order to use VLAN segmentation in conjunction with port trunk groups, first set the port trunk group(s), and then configure the VLAN settings. To change the port trunk grouping with VLANs already in place it is unnecessary to reconfigure the VLAN settings after changing the port trunk group settings. VLAN settings will automatically change in conjunction with the change of the port trunk group settings. To view the following window, click L2 Features > 802.1Q VLAN: Figure 3 - 6. VLAN List tab of the 802.1Q VLAN window 58