Description of problem:
unable to start a network with bandwidth description for outbound QOS
my xml for network

<network>
  <name>sda</name>
  <uuid>173997d2-61b6-4425-a852-8f07a877f75f</uuid>
  <forward dev='enp3s0' mode='nat'>
    <nat>
      <port start='1024' end='2048'/>
    </nat>
    <interface dev='enp3s0'/>
  </forward>
  <bridge name='virbr0' stp='on' delay='0'/>
  <mac address='52:54:00:90:cb:d0'/>
  <domain name='sda'/>
  <bandwidth>
    <inbound average='50' peak='50' burst='50'/>
    <outbound average='50' peak='50' burst='50'/>
  </bandwidth>
  <ip address='192.100.0.12' netmask='255.255.255.0'>
  </ip>
</network>


Version-Release number of selected component (if applicable):libvirt 3.9.0


How reproducible:100%


Steps to Reproduce:
1.create a network with nat mode and with bandwith outbound rule in Qos
2.start the network


Actual results:
libvirt:  error : internal error: Child process (/usr/bin/tc filter add dev virbr0 parent ffff: protocol all u32 match u32 0 0 police rate 50kbps burst 50kb mtu 64kb drop flowid :1) unexpected exit status 1: What is ":1"?
Usage: ... u32 [ match SELECTOR ... ] [ link HTID ] [ classid CLASSID ]
               [ action ACTION_SPEC ] [ offset OFFSET_SPEC ]
               [ ht HTID ] [ hashkey HASHKEY_SPEC ]
               [ sample SAMPLE ] [skip_hw | skip_sw]
or         u32 divisor DIVISOR

Where: SELECTOR := SAMPLE SAMPLE ...
       SAMPLE := { ip | ip6 | udp | tcp | icmp | u{32|16|8} | mark }
                 SAMPLE_ARGS [ divisor DIVISOR ]
       FILTERID := X:Y:Z

NOTE: CLASSID is parsed at hexadecimal input.
libvirt: Network Driver error : Network not found: no network with matching uuid 'a734e030-f800-4b72-a077-f360134bdc13' (sda)


Expected results:
Network must start automatically

Additional info:
qemu version :2.10.0
dnsmasq is installed