vlans in A Sentence

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    For these Vlans, different ports can be assigned.

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    2

    Separating Vlans divides broadcast domains as well.

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    3

    Virtual interfaces(Vlans): 100.

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    4

    All the Vlans are mapped to the CIST by default.

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    5

    Finally, it's worth noting that Vlans aren't a great security device.

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    6

    This is the behavior, though, of a“flat” Ethernet network w/o any Vlans.

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    7

    Virtual local area networks(Vlans) allow us to create different logical and physical networks;

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    8

    Dynamic Vlans are a more advanced topic but knowing that the functionality exists can be helpful.

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    9

    Vlans have the same attributes as a LAN, but they assign devices regardless of their physical location.

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    10

    Eventually, with enough Vlans, you will be eating up all the ports on your switches with these inter-VLAN/ inter-switch connections.

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    11

    When you create the Vlans on your switch you will have to assign them some type of VLAN name or number.

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    12

    What's needed is a way to carry the packets from multiple Vlans along a single connection- a“trunk” connection between switches.

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    13

    In lieu of duplicating the text of another answer here I will refer you to my answer re: when to create Vlans.

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    14

    One helpful analogy is that by creating multiple Vlans, the number of broadcast domains increases, but the size of each broadcast domain decreases.

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    15

    Splitting switches using Vlans is good, but having to run multiple cables from other switches to ports which are members of different Vlans seems messy.

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    16

    In the context of Vlans, the term trunk denotes a network link carrying multiple Vlans, which are identified by labels(or tags) inserted into their packets.

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    17

    I will be speaking about Ethernet Vlans in this answer(even though other networking technologies can support Vlans) and I won't be diving deeply into every nuance.

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    18

    When you have gotten comfortable with Vlans you will probably want to go back and read about“VLAN pruning”, which is associated with protocols like VTP and MVRP.

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    19

    Reading up on the 802.1Q tagging standard is also a decent thing to do at this point(especially since I'm not talking about things like“native Vlans” or double-tagging).

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    20

    In our example we're using Vlans to limit broadcast domains(to keep protocols like DHCP working right) and, secondarily, because we want isolation between the various tenants' networks.

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    21

    Vlans and IP subnets provide independent layer 2 and layer 3 constructs that map to one another and this correspondence is useful during the network design process.

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    22

    For a value much lower than a fully managed switch they supply an online interface(and normally no CLI access) and permit configuration of fundamental settings, corresponding to Vlans, port-bandwidth and duplex.

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    23

    For a price much lower than a fully managed switch they provide a web interface(and usually no CLI access) and allow configuration of basic settings, such as Vlans, port-bandwidth and duplex.

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    24

    Because the devices connected to“access” ports aren't aware that Vlans are being used the“tag” information must be stripped from the frame before it's sent out a port configured in access mode.

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    25

    For a price much lower than a fully managed switch they provide a web interface(and usually no CLI access) and allow configuration of basic settings, such as Vlans, port-speed and duplex.

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    26

    If you're using Vlans to segregate traffic for security or policy reasons then you also probably won't want to combine multiple subnets in the same VLAN since you will be defeating the purpose of isolation.

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    27

    Undoubtedly, if you had to divide the basement switch 4 ways between tenants who also had space on higher floors you would use 4 ports on the basement switch just to terminate“feeder” cables from upstairs Vlans.

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    28

    It is fair to say, though, that in situations with untrusted Internet connections or DMZ networks it's probably better to use physically separate switches to carry this“touchy” traffic rather than Vlans on switches that also carry your trusted“behind the firewall” traffic.

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    29

    You could split the basement switch using Vlans(into, say, Vlans 2 and 13) and run a cable from floor 1 to a port assigned to VLAN 2 in the basement, but you better judgement tells you that this could quickly become a rat's nest of cables(and is only going to get worse).

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    30

    Once you have divided the floor 3 switch into Vlans 12 and 13 you find that the new floor 3 tenant can plug in their DHCP server to one of the ports assigned to VLAN 13 and a PC plugged into a port assigned to VLAN 12 doesn't get an IP address from the new DHCP server.

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