[CentOS] Balance of tcp traffic

Hello,
Anyone know a method to discriminate traffic by preference?, for example
this channels:
High preference traffic.
Low preference traffic.

All traffic in the same interface eth0, and two servers in the same
machine, one in slow channel and one in high preference channel.
When high preference channel is not used low preference channel should
be caught all line speed.

Anyone know if tc command can help to make this?

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