There are a number
of link state considerations and impact to routing when there are Exchange 2003 servers in
the organization.
The costs are summarized in the following table.
Option Path Cost (Legacy, Site)
1 Site 1 to RG A; RG A to RG B 20, 0
2 Site 1 to Site 2; Site 2 to RG B 15, 70
3 Site 1 to Site 2 0, 80
4 Site 1 to Site 3 0, 60
Working with
Continuous Replication
Many companies have grown to recognize email as a business - critical application. Also, messaging
platforms have integrated into areas such as Unified Messaging and workflow processes. New
ways to access mail and documents through mobile phones and VPNs make user access 24x7x365.
Because of this reliance on these services, companies need to make Exchange available without
interruption. It is no longer acceptable to take a service offline ??” even for maintenance. In
response to customer needs, Microsoft designed Exchange to work in a Windows cluster. In this
configuration, Exchange is fault tolerant to hardware failure by sharing a single copy of the
database and log files. This solution also provides the benefit for administrators to minimize
downtime due to regular server maintenance, such as applying security updates.
However, in recent years, catastrophic events like Hurricane Katrina and the World Trade Center
bombing in 1993 and terrorist attacks on 9/11 forced companies to think about site resiliency.
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