[Xorp-hackers] Can the router send some information to end system?

[jerry zhao]

Hello, all
I am a newie with router software. I hope that someone could help me.
It is supposed that there exists the following scenario:

           server<- - - ->router<- - - - ->client

Can the router send some information ( e.g. its buffer state) to the server?
Any advice is appreciated. Thanks.
Best regards
Jerry
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