From IP Location
Chapter 4 described how an IP device might learn its location using the HELD protocol. In an enterprise network, the HELD protocol is not the only candidate for location acquisition; DHCP and LLDP-MED, described briefly in Chapter 1, also have a role to play. This chapter is broken into five parts: enterprise network access technology overview, location determination in enterprise networks, location acquisition in enterprise networks, enterprise location considerations, and enterprise location applications.
Enterprise Network Access Technologies
Enterprise networks are diverse. They can be large or small, flat or hierarchical, contiguous or disjointed, wireless or wired the list goes on and on. There is no standard for what constitutes an enterprise network, consequently the technologies and mechanisms that are needed to determine location also vary from network to network. This section describes two enterprise access technologies and configurations.
Wired Ethernet Networks
Wired Ethernets are used extensively in Enterprise networks and can be configured and connected in a multitude of ways. Networks are constructed to keep interswitch and internetwork traffic to a minimum so as to optimize network performance. This is done by placing frequently communicating machines on the same switch or stack of switches. Where this is not possible, switches may be cascaded together and VLANs introduced to keep different LAN streams on the same switch separated.
IP addresses may be statically configured, or as is generally the case, provided dynamically using the Dynamic Host Configuration Protocol (DHCP) as described in Reference 1 at the end of the chapter, by a...
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Topics of Interest
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