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Another option is to use 8021x authentication, briefly discussed in 5, which is used to authenticate a device s access to a switch or wireless access point The authentication credentials are stored on an authentication server One policy you can assign the user account (associated with the authenticating device) on the authentication server is the VLAN to which the device belongs the server can pass this to the layer 2 device, which, in turn, can associate the VLAN to the port with which the authenticated device is associated Dynamic VLANs have one main advantage over static VLANs: they support plug-and-play movability For instance, if you move a PC from a port on one switch to a port on another switch and you are using dynamic VLANs, the new switch port will automatically be configured for the VLAN to which the user belongs About the only time that you have to configure information with dynamic VLANs is if you hire an employee and the employee leaves the company or changes job functions If you are using static VLANs, not only will you have to configure the switch port manually with this updated information, but if you move the user from one switch to another, you will also have to perform this manual configuration to reflect the user s new port One advantage, though, that static VLANs have over dynamic VLANs is that since they have been around much longer than dynamic VLANs, the configuration process is easy and straightforward Dynamic VLANs require a lot of initial preparation involving matching users to VLANs (This book focuses exclusively on static VLANs, as dynamic VLANs are beyond the book s scope) Voice VLANs are unique They are associated to ports that have VoIP phones attached Some VoIP phones might have a multiport switch attached to them, to allow other devices to connect to the switch via the phone In this instance, the phone might tag frames to indicate which device is sending the traffic phone or computer that the switch can then use to deal with the traffic correctly
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When dealing with VLANs, switches support two types of switch ports: access-links and trunks When setting up your switches, you will need to know what type of connection an interface should use and configure it appropriately As you will see, the configuration process for each type of interface is different This section discusses the two types of connections
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13: VLANs and Trunks
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An access-link connection is a connection to a device that has a standardized Ethernet NIC that understands only standardized Ethernet frames in other words, a normal NIC card that understands IEEE 8023 and Ethernet II frames Access-link connections can be associated only with a single VLAN (voice VLAN ports are an exception to this) This means that any device or devices connected to this port will be in the same broadcast domain For example, if ten users are connected to a hub, and you plug the hub into an access-link interface on a switch, then all of these users will belong to the same VLAN that is associated with the switch port If you wanted five users on the hub to belong to one VLAN and the other five to a different VLAN, you would need to purchase an additional hub and plug each hub into a different switch port Then, on the switch, you would need to configure each of these ports with the correct VLAN identifier
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An access-link connection is a connection between a switch and a device with a normal Ethernet NIC, where the Ethernet frames are transmitted
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unaltered (untagged) An access-link normally can be associated only with a single VLAN
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Trunk Connections
Unlike access-link connections, trunk connections are capable of carrying traffic for multiple VLANs To support trunking, the original Ethernet frame must be modified to carry VLAN information, commonly called a VLAN identifier or number This ensures that the broadcast integrity is maintained For instance, if a device from VLAN 1 has generated a broadcast and the connected switch has received it, when this switch forwards it to other switches, these switches need to know the VLAN origin so that they can forward this frame out only VLAN 1 ports and not other VLAN ports Cisco supports two Ethernet trunking methods:
Cisco s proprietary InterSwitch Link (ISL) protocol for Ethernet IEEE s 8021Q, commonly referred to as dot1q for Ethernet
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