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IPSI configuration
In a Multi-Connect system, IPSI configuration is automatic. Upon power-up, IPSIs send out a
DHCP request on the control network. The S8700s, then, provide DHCP addresses and server
configuration information to the IPSIs.
Server separation
The S8700 servers can be separated by a maximum distance of 10 km. This limitation is based
on the fiber channel interface used for memory shadowing. When contemplating a 10 km server
separation, it is important to plan for the Ethernet separation, as well. Both servers' arbitration
link and control network links MUST be on the same IP subnet. Although the use of media
converters to convert the 10/100BaseTX Ethernet to 100BaseFX is an approved configuration,
it is not recommended. Media converters are not reliable and are difficult to troubleshoot. As
shown in
Figure 86: S8700 Multi-Connect system
is to use two P130 switches with 100BaseFX (or gigabit) interfaces. Each server would connect
to one switch, and the two switches would be linked by a fiber optic connection. This solution is
much more reliable and easier to troubleshoot.
Control Network on Customer LAN (CNOCL)
Prior to Avaya Communication Manager 2.0, the S8700 Multi-Connect Control Network was
required to be implemented on a private, dedicated network. A private, dedicated Control
Network provides the much needed and desired system reliability and availability. The system is
isolated and hence much more secure, and less prone to security attacks from the likes of virus
attacks, Denial of Service (DoS) attacks, and broadcast storms. Thus, even though it is highly
recommended that customers with business-critical telephony applications implement the
Control Network on a private, dedicated network, Avaya Communication Manager 2.0 provides
the option of implementing the Control Network on existing enterprise LAN infrastructure. This
section provides implementation and installation recommendations when implementing the
Control Network of an S8700 Multi-Connect system on an enterprise network.
Network Engineering Guidelines
The reliability of a Multi-Connect system can only be as good as the reliability of the control
network. Typically, enterprise LANs are approximately 99.9% reliable, while WANs reach
approximately 99% reliability. In order to approach 99.999% (five-9s) reliability for the
Multi-Connect system, the enterprise data network must take advantage of network design best
practices, failover mechanisms, and strict change control.
on page 336, the recommended alternative
Issue 3.4.1 June 2005
S8700 Multi-Connect
337
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