You can??™t load-balance multiple edge servers at all in the consolidated
topology. The only way you??™re going to load-balance your site is if you require one or more
dedicated computers with colocated Access Edge Servers with Web Conferencing Edge
Servers and one or more dedicated computers with A/V Edge Conferencing Servers. So, if
you??™re going to deploy the consolidated edge topology at fi rst and then later decide that you
want to scale, you??™re going to have to deploy an entirely new edge topology. This is a major
issue you need to think about before you start.
But that??™s not the only issue with edge servers. If you want to support public IM connectivity
and federation, you need to make sure you have an external DNS SRV record for
your Access Edge Server.
Microsoft Office Communications Server 2007 ??? Chapter 2 57
You can use only one Access Edge Server or array of Access Edge Servers for public IM
connectivity and federation. This means that an Access Edge Server or an array of Access Edge
Servers can be in only one physical location. Your remote sites can??™t deploy Access Edge Servers.
You??™ll need to make sure you have a reverse HTTP proxy for remote users to download
Address Book fi les and expand distribution lists, and to allow external users access to meeting
content for Web conferences.
The network interfaces of your A/V Edge Servers have to be directly addressable at the
IP layer. You can??™t use NAT with them.
Finally, there are several other general concerns you need to be aware of.
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