def update_dvs(dvs_dict, dvs, service_instance=None):
    '''
    Updates a distributed virtual switch (DVS).

    Note: Updating the product info, capability, uplinks of a DVS is not
          supported so the corresponding entries in ``dvs_dict`` will be
          ignored.

    dvs_dict
        Dictionary with the values the DVS should be update with
        (example in salt.states.dvs)

    dvs
        Name of the DVS to be updated.

    service_instance
        Service instance (vim.ServiceInstance) of the vCenter.
        Default is None.

    .. code-block:: bash

        salt '*' vsphere.update_dvs dvs_dict=$dvs_dict dvs=dvs1
    '''
    # Remove ignored properties
    log.trace('Updating dvs \'%s\' with dict = %s', dvs, dvs_dict)
    for prop in ['product_info', 'capability', 'uplink_names', 'name']:
        if prop in dvs_dict:
            del dvs_dict[prop]
    proxy_type = get_proxy_type()
    if proxy_type == 'esxdatacenter':
        datacenter = __salt__['esxdatacenter.get_details']()['datacenter']
        dc_ref = _get_proxy_target(service_instance)
    elif proxy_type == 'esxcluster':
        datacenter = __salt__['esxcluster.get_details']()['datacenter']
        dc_ref = salt.utils.vmware.get_datacenter(service_instance, datacenter)
    dvs_refs = salt.utils.vmware.get_dvss(dc_ref, dvs_names=[dvs])
    if not dvs_refs:
        raise VMwareObjectRetrievalError('DVS \'{0}\' wasn\'t found in '
                                         'datacenter \'{1}\''
                                         ''.format(dvs, datacenter))
    dvs_ref = dvs_refs[0]
    # Build the config spec from the input
    dvs_props = salt.utils.vmware.get_properties_of_managed_object(
        dvs_ref, ['config', 'capability'])
    dvs_config = vim.VMwareDVSConfigSpec()
    # Copy all of the properties in the config of the of the DVS to a
    # DvsConfigSpec
    skipped_properties = ['host']
    for prop in dvs_config.__dict__.keys():
        if prop in skipped_properties:
            continue
        if hasattr(dvs_props['config'], prop):
            setattr(dvs_config, prop, getattr(dvs_props['config'], prop))
    _apply_dvs_config(dvs_config, dvs_dict)
    if dvs_dict.get('link_discovery_protocol'):
        if not dvs_config.linkDiscoveryProtocolConfig:
            dvs_config.linkDiscoveryProtocolConfig = \
                    vim.LinkDiscoveryProtocolConfig()
        _apply_dvs_link_discovery_protocol(
            dvs_config.linkDiscoveryProtocolConfig,
            dvs_dict['link_discovery_protocol'])
    if dvs_dict.get('infrastructure_traffic_resource_pools'):
        if not dvs_config.infrastructureTrafficResourceConfig:
            dvs_config.infrastructureTrafficResourceConfig = []
        _apply_dvs_infrastructure_traffic_resources(
            dvs_config.infrastructureTrafficResourceConfig,
            dvs_dict['infrastructure_traffic_resource_pools'])
    log.trace('dvs_config = %s', dvs_config)
    salt.utils.vmware.update_dvs(dvs_ref, dvs_config_spec=dvs_config)
    if 'network_resource_management_enabled' in dvs_dict:
        salt.utils.vmware.set_dvs_network_resource_management_enabled(
            dvs_ref, dvs_dict['network_resource_management_enabled'])
    return True
Updates a distributed virtual switch (DVS).

    Note: Updating the product info, capability, uplinks of a DVS is not
          supported so the corresponding entries in ``dvs_dict`` will be
          ignored.

    dvs_dict
        Dictionary with the values the DVS should be update with
        (example in salt.states.dvs)

    dvs
        Name of the DVS to be updated.

    service_instance
        Service instance (vim.ServiceInstance) of the vCenter.
        Default is None.

    .. code-block:: bash

        salt '*' vsphere.update_dvs dvs_dict=$dvs_dict dvs=dvs1