Alloy Computer Products 16/24 gigabit web managed switch manual

GSS Series User Manual

3.2.3 VLAN Mode

The GSS Series of switches support port based VLAN’s, 802.1q tagged VLAN’s and Metro mode VLAN’s. Up to 16 active Port Based VLAN groups can be configured with a PVID from 1 ~ 4094 for the GSS-16T4SFP and 24 active Port Based VLAN groups can be configured for the GSS-24T4SFP. 24 802.1q Tagged based VLAN’s can be created on both models with a PVID ranging from 1 ~ 4094.

Fig. 3.4

VLAN Mode: Select which VLAN mode you would like to use.

Port Based: Port Based VLAN’s are used to logically separate your switch into multiple Virtual Local Area Networks. Port Based VLAN’s work by grouping particular ports into groups based on a Group ID. If ports 1, 2, 3 and 4 are configured to belong to VLAN group ID 2 and ports 5, 6, 7 and 8 are configured to belong to VLAN group ID 1, these ports will not be able to communicate with each other. Only ports that belong to the same VLAN Group ID will be able to communicate. A typical example of port based vlan’s could be used in an internet café where all computers are not allowed to communicate with each other but must communicate to a single port for internet access. The switch would then be configured with 7 vlan groups. Each VLAN group will consist of 2 ports one for the computer and one for the internet router. This will then block each computer from communicating with each other, but still enable communication with the port connected to the internet router. Port based VLAN’s can only be used on single switches if you wish to span your VLAN’s across multiple switches 802.1q Tag VLAN’s must be used.

Tag-Based:Tag-based VLAN’s identify members by its VID. A VID can be applied to a packet from a host machine that supports 802.1q or from the switch itself when a packet is sent from the switch. Ingress and Egress rules can also be applied to each port to identify how a packet is handled. The switch will accept both tagged and un-tagged packets depending on the ingress rules that have been defined. Rules can be created to allow only incoming packets to be tagged; however when this Rule is applied any untagged packets will be dropped.