Emergency help needed on host network randomly stop working.

[Magicloud Magiclouds <magicloud.magiclouds@xxxxxxxxx>]

Hi,
  This is a Centos 5.5 host with one xen guest.
  About 2 weeks ago, the host randomly lost network connection. By
this I mean I could not connect to the services on it, or ping it.
Also was the status of the guest.
  From serial console, I connected to the host, trying to see what
happened. No clue (any error messages) in messages or dmesg.
ifdown/ifup the interface did not help, either. Only rebooting was my
only choice.
  Searching through Google, I got the information that some other guys
met similar problem, and resolved by setting stp on with the bridge
interface.
  I set it, too. And the problem still occurs.
  Any idea what I should check now?
  Thanks.
-- 
竹密岂妨流水过
山高哪阻野云飞
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