yum update/install from a specific repo

[PK]

hello:

had a quick question. Is there a way to check/install updates from a
specific repo through yum. So say I have fedora, livna and atrpms repos on
my box, would like to install /update only from fedora. So for example,
up2date has a way of getting updates from a specific channel i.e up2date
--channel=updates -u.

so whats equivalent of that with yum?

thanks
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