network_id = models.CharField(null=True, blank=True, max_length=256, help_text="Quantum network")
router_id = models.CharField(null=True, blank=True, max_length=256, help_text="Quantum router id")
subnet_id = models.CharField(null=True, blank=True, max_length=256, help_text="Quantum subnet id")
+ imagePreference = models.CharField(default="abc",null=True, blank=True, max_length=256)
service = models.ForeignKey(Service, related_name='service', null=True, blank=True)
tags = generic.GenericRelation(Tag)