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Chapter 1 Introduction
System Hardware Features
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Cisco Global Site Selector 4491 Hardware Installation Guide
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The GSS is the cornerstone of disaster recovery in such distributed deployments
and enables businesses to confidently deploy global Internet and intranet
applications with the knowledge that users will be quickly routed to standby data
centers should problems occur.
The GSS is deployed at strategic locations within your network. The GSS
performs two major functions when deployed with other SLBs by:
• Taking an active role in the domain name server (DNS) infrastructure,
connecting clients to SLBs that support the requested website.
• Continuously monitoring the load and availability of SLBs in its network,
selecting the SLB that is most able to answer each client request.
By off-loading DNS resolution from traditional DNS servers, the GSS optimizes
global site selection and increases DNS responsiveness. The GSS increases the
fault tolerance and scalability of large websites and data centers through its
monitoring of load and availability.
System Hardware Features
The GSS is designed for AC-input power and has a single AC-input power supply.
The GSS includes:
• An integrated dual-port Ethernet controller that provides an interface for
connecting to 10-Mbps, 100-Mbps, or 1000-Mbps networks.
• Two 10BASE-T/100BASE-TX/1000BASE-TX Ethernet ports with RJ-45
receptacles.
Both Ethernet ports support autonegotitate, full-duplex, or half-duplex operation
on an Ethernet LAN.
This section includes the following topics:
• Front Panel Features
• Rear Panel Features