Generally when Xen is setup the Domain 0 automagically sets up the ethernet bridging itself.
You can see if this is intiated by "sudo /usr/sbin/route -n" and it will give you the ethernet brigding setup as part of the routing.
I don't know about CentOS, but OpenSuse 11.1 and Xen (latest stable) work strat out of the box as they say.
If your not able to get the ethernet bridge setup, and it not a problem with your initial configuration, then join the xen-users mailing list and ask there.
Hope this assists.
Cheers. WP
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