VLANS
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VLAN’s are Virtual Local Area Networks. VLAN’s have greater flexibility, more bandwidth, better security, and broadcast control. When using a VLAN broadcast sent out from one node in VLAN will not be forwarded to another VLAN. Layer 3 switches control this. VLAN’s are not held to just the immediate area, they can span over several physical LAN segments. VLAN’s give the capability to increase the number of collision and broadcast domains in your network. VLAN’s must be connected to a layer 3 device in order to talk to each other
VLAN’s Include several connected switches, frame tagging keeps track of where all the frames need to go. Two different links that are used in a switched environment. Access Links: Links can belong to only one VLAN. Must go through a router in order to communicate to devices outside the VLAN. Trunk Links: Support multiple VLAN’s, and can connect switches to other switches, routers, and servers. Also can be used on Fast or Gigabyte Ethernet. Inter-Switch Link (ISL) Protocol: Used to tag data as it travels between switches and trunk links. ISL can be used on a switch port and a router interface. It uses external framing as to not bother the original frame. It allows VLAN’s to be multiplexed. Devices must be ISL compatible. Frame Tagging: A switch used to keep track of users and frames in VLAN’s. When it does this it is given a unique identification code to help determine which VLAN in belongs to.
VLAN Memberships Static- Manually changes port assignments, most often way of creating a VLAN. Dynamic- Determine port assignment automatically, Management Policy Server is used to establish a database of MACX addresses. VLAN Trunks Trunks Trunking gives you the option to make a single port part of multiple VLAN’_s. Another aspect is that a server can support two broadcast domains at the same time and a router is not needed. VTP (VLAN Trunk Protocol) –Used to manage all the VLAN’s. Must have a VTP server to work. VTP Domain- All severs must have the same domain name.
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