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


  • To: xen-users@xxxxxxxxxxxxx
  • From: Vadym Chepkov <vchepkov@xxxxxxxxx>
  • Date: Sun, 1 Jul 2012 08:04:36 -0400
  • Delivery-date: Sun, 01 Jul 2012 12:05:58 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

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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