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19.1.2 Switch Virtual Interface Configuration

To access the switch remotely, an IP address and a subnet mask must be configured on the switch virtual interface (SVI). To configure an SVI on a switch, use the interface vlan 1 global configuration command. Vlan 1 is not an actual physical interface but a virtual one. Next, assign an IPv4 address using the ip address ip-address subnet-mask interface configuration command. Finally, enable the virtual interface using the no shutdown interface configuration command.

After the switch is configured with these commands, the switch has all the IPv4 elements ready for communication over the network.

Note: Similar to Windows hosts, switches configured with an IPv4 address will typically also need to have a default gateway assigned. This can be done using the ip default-gateway ip-address global configuration command. The ip-address parameter would be the IPv4 address of the local router on the network, as shown in the example. However, in this topic you will only be configuring a network with switches and hosts. Routers will be configured later.

@Configuration配置和@ConfigurationProperties加载外部配置注解的使用。

那么在Spring boot项目中，应用上下文又是如何找到那么多配置并加载初始化好的呢？

@SpringBootApplication
spring boot项目推荐大家在主类中标注@SpringBootApplication这个注解，我们来看看它的源码：
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration //配置
@EnableAutoConfiguration //启用自动配置
//组件扫描
@ComponentScan(excludeFilters = @Filter(type = FilterType.CUSTOM, classes = TypeExcludeFilter.class))
public @interface SpringBootApplication {
//需要排除的自动配置类
Class<?>[] exclude() default {};
//需要排除的自动配置类类名
String[] excludeName() default {};

 //扫描包路径

@AliasFor(annotation = ComponentScan.class, attribute = "basePackages")
String[] scanBasePackages() default {};

  //扫描包路径类

@AliasFor(annotation = ComponentScan.class, attribute = "basePackageClasses")
Class<?>[] scanBasePackageClasses() default {};
}
@EnableAutoConfiguration
我们发现一个配置开关注解，名字叫@EnableAutoConfiguration，看看它的源码：
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@AutoConfigurationPackage
@Import(EnableAutoConfigurationImportSelector.class)
public @interface EnableAutoConfiguration {

//是否启用自动配置的总开关名

String ENABLED_OVERRIDE_PROPERTY = "spring.boot.enableautoconfiguration";
//需要排除的自动配置类
Class<?>[] exclude() default {};

//需要排除的自动配置类类名

String[] excludeName() default {};
}
EnableAutoConfigurationImportSelector
我们看到有一个@Import导入了选择器EnableAutoConfigurationImportSelector.class，看看它的源码：
public class EnableAutoConfigurationImportSelector

  implements DeferredImportSelector, BeanClassLoaderAware, ResourceLoaderAware,
  BeanFactoryAware, EnvironmentAware, Ordered {

...

c# – System.Configuration.ConfigurationManager未解析

using System.Configuration;

string primary_adrs_key =  ConfigurationManager.AppSettings["PrimaryAddressK"];

c# – 在localhost开发期间是否可以选择Azure ServiceConfiguration？例如.云？

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