User guide

Licensed Customer Confidential Planning RedirectorSink/RedirectorController Placement
Email Continuity Administrator Guide version 6.5 (1st ed.) 35
Planning RedirectorSink/RedirectorController
Placement
RedirectorSinks are required to use the partial activation feature in Exchange
2000/2003 environments. Installed on Exchange servers, RedirectorSinks are
SMTP event sinks that redirect messages in your Exchange environment for
active Email Continuity users to the data center. RedirectorSinks receive this
routing information from the RedirectorControllers.
NOTE Partial Activation in Exchange 2007 Environments
The partial activation feature is supported for Exchange 2007. Instead of using
RedirectorSinks, the service uses a custom Transport Agent installed on the
Hub Transport Server. For more information, see "Installing the
RedirectorAgent" on page 60.
RedirectorSink Placement
An Exchange server without RedirectorSinks and RedirectorControllers cannot
redirect mail for active Email Continuity users. For this reason, Support
recommends that you install a RedirectorSink on all Microsoft Exchange 2000/
2003 servers in your environment.
This configuration allows for the greatest level of flexibility and coverage in the
event of an outage. By deploying the RedirectorSinks to all Exchange servers in
the environment, not only can the servers redirect messages at the first possible
hop, but redirection is possible for partial server outages.
When planning for RedirectorSinks, consider the following:
• Bridgehead and SMTP gateway servers—Installation on bridgehead and
SMTP gateway servers is critical for redirection. By installing
RedirectorSinks on SMTP gateway servers, inbound SMTP mail for active
users is redirected at the first hop, minimizing network traffic and providing
maximum flexibility in the event of an outage.
Bridgehead servers act as concentrators for message traffic. Even if no
mailboxes are on the bridgehead servers themselves, because messages
in transit to an active recipient may pass through these, it is important that
they include installed RedirectorSinks.
• Mailbox servers—Installation of a RedirectorSink on each mailbox server
in your environment allows for redirection of mail between routing group
peers, as well as redirection of intraserver message traffic. This protects
against failure of a single server in a routing group, as well as in the event
of a single database or storage group failure.
• Public folder servers—Typically, dedicated public folder servers do not
have messages destined for mailbox recipients transiting them. So, while
deploying a RedirectorSink on this type of server may not be essential, it is
still considered a best practice.