Figure 2-4 displays some
common components of a network; this along with the traf?¬?c requirements should be a
baseline for designing VLANs.
Figure 2-4 Network Enterprise Components
1 Gbps
Server Farm
Multicast
Server
Cisco
Unified
CallManager
Departmental
Switch Block 1
Departmental
Switch Block 2
Scavenger
IP
IP
IP Telephony
Implementing VLANs and Trunks 21
Table 2-5 lists the common types of network traf?¬?c that should be considered before placing
devices and con?¬?guring the VLAN.
1 BPDUs = bridge protocol data units
2 CDP = Cisco Discovery Protocol
3 SNMP = Simple Network Management Protocol
4 RMON = Remote Monitoring
5 QoS = quality of service
6 SMB = Server Message Block
7 NCP = Netware Core Protocol
8 SMTP = Simple Mail Transfer Protocol
9 SQL = Structured Query Language
Table 2-5 Traf?¬?c Types
Traffic Type Description
Network
management
Many different types of network management traf?¬?c can be present on the
network, such as BPDUs1, CDP2 updates, SNMP3 traf?¬?c, and RMON4
traf?¬?c. To make network troubleshooting easier, some designers assign a
separate VLAN to carry certain types of network management traf?¬?c.
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