Question on Exchange 2003 Routing Groups
Posted on 2010-01-06
I have a question on Exchange 2003 Routing Groups that has been bugging me.
Let's say I have three routing groups - NY, LA, and London.
Network wise, there is a WAN link from NY to London, and London to LA, but not one from LA to NY.
My routing group connectors are set up so that:
i) 1 x connector from NY > London : Cost 10
ii) 1 x Connector from London > NY: Cost 10
iii) 1 x Connector from London > LA: Cost 10
iv) 1 x Connector from LA > London: Cost 10
v) 1 x Connector from LA > NY: Cost 50
vi) 1 x Connector from NY > LA: Cost 50
Now, due to least cost routing, mail from NY to LA should travel via London, am I correct?
However, what if the London Exchange bridgehead goes down (NB: the WAN is still up)? The alternative routing path for NY > LA is direct, but what if there is no direct WAN link? Would Exchange know to route the mail via the London network even though it wasn't routing via the London bridgehead?