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Many network administrators use VLANs not only to separate different types of user traffic (commonly separated by job function), but also to separate it based on the type of traffic, placing network management, multicast, and voice over IP (VoIP) traffic into their own distinctive VLANs Network management traffic includes Simple Network Management Protocol (SNMP); Remote Monitoring (RMON); Spanning Tree Protocol (STP); Bridge Protocol Data Units (BPDUs), discussed in 14; Cisco Discovery Protocol (CDP) messages, discussed in 17; syslog messages; Network Time Protocol (NTP) updates; configuration backups of network devices, discussed in 17; and network device operating system upgrades, discussed in 17 Multicast traffic is commonly used by video applications to transmit video streams intelligently from a server to one or more clients interested in seeing it, where UDP is used as a transport for the video stream An example of a video solution that uses multicasts is Cisco s IP/TV server Video traffic is delay sensitive too much delay can be noticeable by the end user, where the actual video picture looks jumpy and jagged By separating this traffic from other types through VLANs, and by setting up the necessary quality of service (QoS) for this VLAN traffic, you can help minimize or prevent delay issues
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VoIP traffic includes two kinds of traffic: signaling information sent from the VoIP phones to the VoIP gateway products, such as Cisco s Call Manager, and the actual voice conversations, which use UDP as a transport between VoIP phones and/or digital phones connected to VoIP PBXs One issue with VoIP traffic is that it is delay-sensitive, so mixing this kind of traffic with other data types can cause performance issues that are very noticeable on voice connections; separating this traffic in its own VLAN and using QoS to ensure that this kind of traffic is given higher priority than other types is an important design consideration Some Cisco Catalyst switches support a special type of VLAN, called a voice VLAN With the voice VLAN feature, switches will automatically place a Cisco VoIP phone automatically into the voice VLAN once the VoIP phone is plugged into the switch The advantage of this approach is that you, as an administrator, no longer have to worry, when a VoIP phone is added to the network, that you need to configure the switch to place the phone into the correct VLAN
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Different data types, such as voice, video (multicast), network management, and data application traf c, should be separated into different VLANs via connected switches to prevent problems
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in one data type affecting others QoS can be used to prioritize traf c types like VoIP and video to ensure that they receive the necessary bandwidth and are prioritized over other types of data traf c
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A device s membership in a VLAN can be determined by one of three methods: static, dynamic, or voice These methods affect how a switch will associate a port in its chassis with a particular VLAN When you are dealing with static VLANs, you must manually assign a port on a switch to a VLAN using an Interface Subconfiguration mode command VLANs configured in this way are typically called port-based VLANs With dynamic VLANs, the switch automatically assigns the port to a VLAN using information from the user device, such as its MAC address, IP address, or even directory information (a user or group name, for instance) The switch then consults a policy server, called a VLAN membership policy server (VMPS), which contains a mapping of device information to VLANs One of the switches in your network must be configured as this server Low-end Cisco switches cannot serve as a VMPS server switch, but other switches, such as the Catalyst 6500, can In this situation, the low-end switches act as clients and use the 6500 to store the dynamic VLAN membership information
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