xen安装虚拟机报错Virtual network 'default' does not exist

运行   virt-install -n aaaa -r 512 -f /xen/aaaa.img  -l nfs:192.168.111.2:/mnt/  报错：

ERROR    Virtual network 'default' does not exist: this function is not supported by the connection driver: virNetworkLookupByName
Traceback (most recent call last):
  File "/usr/sbin/virt-install", line 892, in ?
    main()
  File "/usr/sbin/virt-install", line 678, in main
    options.nonetworks, guest)
  File "/usr/sbin/virt-install", line 251, in get_networks
    map(lambda m, n: cli.get_network(m, n, guest), macs, networks)
  File "/usr/sbin/virt-install", line 251, in
    map(lambda m, n: cli.get_network(m, n, guest), macs, networks)
  File "/usr/lib/python2.4/site-packages/virtinst/cli.py", line 386, in get_network
    conn=guest.conn)
  File "/usr/lib/python2.4/site-packages/virtinst/VirtualNetworkInterface.py", line 53, in __init__
    self.network = network
  File "/usr/lib/python2.4/site-packages/virtinst/VirtualNetworkInterface.py", line 79, in set_network
    raise ValueError(_("Virtual network '%s' does not exist: %s") \
ValueError: Virtual network 'default' does not exist: this function is not supported by the connection driver: virNetworkLookupByName、


解决办法：
重启xend服务
分析：因为变动了网卡的设置，xen可能没有识别现网环境，需要初始化一下（重启xend服务）