[Xen-users] Interfaces are disconnected during start/shutdown

[Vadym Chepkov <vchepkov@xxxxxxxxx>]

Hi,

We are using Xen 3.0.3 (latest in Centos 5) to test our application on 
different platforms.
We constantly start/destroy different guests, variety of Windows and Linux VMs :

# ip addr show|tail -4
25094: vif18682.0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 
500
    link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff
25095: tap4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 
500
    link/ether fe:f4:fd:9d:3d:57 brd ff:ff:ff:ff:ff:ff

All guests reside in xen network:

# virsh net-dumpxml xen
<network>
  <name>xen</name>
  <forward mode='route'/>
  <bridge name='virbr0' stp='on' delay='0' />
  <ip address='10.1.0.1' netmask='255.255.0.0'>
  </ip>
</network>

We are experiencing network disruption, packet losses when guests are 
started/destroyed.
Communications of guests with outside "world" as well as 10.1.0.1 are affected.
What could be the root cause and what we can do to resolve this issue?

Thanks,
Vadym

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