3Com 3C16476BS-US User Guide - Page 36

36 CHAPTER 4: CONFIGURING THE SWITCH Figure 19 Uplink VLAN Configuration Endstation in VLAN 1 (Desktop) Server in VLAN 1 (Desktop) Endstation in VLAN 2 (Desktop) Switch 1 Switch 2 Port 16 in VLANs 1 and 2 (Uplink) Port 8 in VLANs 1 and 2 (Uplink) Endstation in VLAN 2 (Desktop) Endstation in VLAN 1 (Desktop) Server in VLAN 2 (Desktop) To set up the configuration shown in Figure 19, do the following: 1 Create VLAN2 on both Switch 1 and Switch 2, and assign the same name to it. You need not create VLAN1 since it exists by default. 2 On Switch 1, set the ports that you want to be part of VLAN2 to Desktop mode. Set one port (for example, port 16) to Uplink mode. Click Apply. 3 On Switch 2, set the ports that you want to be part of VLAN2 to Desktop mode. Set one port (for example, port 8) to Uplink mode. Click Apply. 4 Connect the uplink port on Switch 1 (in this example, port 16) to the uplink port on Switch 2 (in this example, port 8). Those ports on Switch 1 that are members of VLAN2 can now communicate with those ports on Switch 2 that are members of VLAN2. Configuring Trunking Trunking, also called "link aggregation", refers to bonding multiple ports into a single group to effectively combine the bandwidth into a single connection or a "trunk". If you are connecting the Switch to another switch or to an Internet backbone, you can aggregate links on the Switch to increase throughput and prevent packet loopback between switches. For link aggregation to work, the trunks must be configured on both ends (switches). The Switch does not support the Link Aggregation Control Protocol (LACP), which is specified in IEEE 802.3ad. Guidelines for Creating Trunks ■ Any port on the Switch can be used for creating a trunk. ■ This switch supports a maximum of four trunks. ■ Each trunk may contain up to eight members. ■ A port may only be a member of one trunk at any one time.