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High Traffic between Child Domain and Parent Domain

We  have a child domain with Exchange Server 2013 Installed. We discovered that we have high traffic between the two sites and we ran wireshack on the link. We discovered tha the following protocol:
msft-gc, Microsoft Global Catalog ( is much between the two sites.

We have a GC in the child domain, is there a way to make the Exchange in the child domain talk more to the GC in the child domain?

Is it a good practice to set a Default GC and DC on an exchange server?
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Scott C
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This is an example of high LDAP traffic.

When you run ExPerfWiz use the following...

.\experfwiz.ps1 -duration 02:00:00 -threads -interval 5 -filepath D:\Logs (wherever you want the perf data to go)
LDAP.png
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Seuno

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No event ID 1644, I have event ID 1643.

I have also checked the LDAP traffic using PerfMon and noticed a high LDAP traffic to the parent domain and low LDAP search to the child domain where the exhange server is installed.
I would still install the hotfix on the Domain Controllers.  

Also, look at Pavel's suggestion.  Definitely looks like he could be onto something.