[Xorp-users] Dose Xorp support DiffServ?

[xorp-users]

Hi everyone!
Dose Xorp support DiffServ? i need to make some modification about DiffServ to support our project at college, i want to know whether Xorp implements DiffServ function in it or not? if so, how can i refer to the related code or classes? 
I am a newer to Xorp, Could anyone please do me the favor and give me some guidance, thank you very much!
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