A new feature in Service Pack 1 is the MaxMessageSize parameter. This parameter allows an
administrator to set message size limits on an IP site link. This is particularly useful for preventing
large messages from going over an expensive or slow link.
Working with Hub Sites
Hub sites are used to alter the least cost route to force routing through a specific Active Directory site.
This could be for political or technical reasons, such as network connectivity. To see if an Active Directory
site is enabled as a Hub site, use the Get-ADSite cmdlet. Its syntax is:
Get-ADSite [-Identity < AdSiteIdParameter > ] [-DomainController < Fqdn > ]
Figure 11 - 9 shows the output from Get-ADSite . There are two sites; neither is enabled as Hub sites.
Figure 11-8
Figure 11 - 8 shows an example of setting the ExchangeCost parameter to 150.
Chapter 11: Exchange Server 2007 Routing
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Before enabling a site as a Hub site, check the routing log to see the least cost routing path from the current
Active Directory site to any remote Active Directory site. Hub sites are used only if they are part of
the least cost route. To enable an Active Directory site as a Hub site, use the Set-ADSite cmdlet. The
syntax for Set-ADSite is:
Set-AdSite -Identity < AdSiteIdParameter > [-Confirm [ < SwitchParameter > ]]
[-DomainController < Fqdn > ] [-HubSiteEnabled < $true | $false > ] [-Name
< String > ] [-WhatIf [ < SwitchParameter > ]]
Set-AdSite [-Confirm [ < SwitchParameter > ]] [-DomainController < Fqdn > ]
[-HubSiteEnabled < $true | $false > ] [-Instance < ADSite > ] [-Name < String > ]
[-WhatIf [ < SwitchParameter > ]]
This example sets the Chicago site as a Hub site:
Set-ADSite -Identity ???Chicago??? -HubSiteEnabled:$true
Coexistence with Exchange 2003
How does message routing occur when Microsoft Exchange Server 2007 coexists in the same Exchange
organization with Exchange Server 2003 or Exchange 2000 Server computers? When a large organization
is transitioning from Exchange 2003 to Exchange Server 2007, a period of coexistence between the
versions is likely.
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