General vs Trunk Mode

General vs Trunk Mode

https://community.cisco.com/t5/small-business-switches/general-vs-trunk-mode/td-p/2281870

General vs Trunk Mode (常规模式 与 中继模式 比较 )

Having recently had a run in with General and Trunk modes on an SG500X I was looking for the difference between General and Trunk modes and found this explanation:

最近在SG500X上试运行了常规模式和中继模式，我正在寻找通用模式和中继模式之间的区别，并找到了以下解释：

• General mode allows multiple untagged vlans and also multiple  tagged vlans to exist on the same switch interface. 常规模式允许多个未标记的VLAN，也可以在同一交换机接口上存在多个标记的VLAN。
• Trunk mode allows ONE untagged vlan and multiple Tagged vlans to exist on the same switch interface. 中继模式允许在同一交换机接口上存在一个未标记的VLAN和多个标记的VLAN。
• Access mode allows only one untagged vlan to exist on a switch interface. 访问模式仅允许在交换机接口上存在一个未标记的VLAN。

What I don't understand is how on earth does the swtich tell multiple untagged VLANs apart in General mode???  我不了解的是，交换机在常规模式下到底如何区分多个未标记的VLAN ???

The native VLAN still applies to the General mode.  While it is possible to have multiple untagged vlans on a General port, you can only have ONE (1) PVID.  The PVID represents the native VLAN.

本机VLAN仍适用于常规模式。 虽然在常规端口上可以有多个未标记的VLAN，但您只能有一个（1）PVID。 PVID代表本地VLAN。

Untagged traffic may be sent via several untagged VLANs, returning untagged traffic will only be received by the PVID and therefore will NOT be forwarded to a specific VLAN.

未标记的流量可能会通过多个未标记的VLAN发送，返回的未标记的流量只会由PVID接收，因此不会转发到特定的VLAN。

a trunk port will have an implicit ingress filter that cannot be disabled. A general port may have the ingress filter disabled making it a more true 802.1q operation.

中继端口将具有无法禁用的隐式入口过滤器。 常规端口可能禁用了入口过滤器，从而使其成为更真实的802.1q操作。

General mode ports have a tendancy to work better when interoperating with non-small business products and 3rd party vendors due to the flexibility in configuration options, namely you don't have to specify a tagged default vlan, you may disable the ingress filtering.   Unlike a trunk mode, there is a special command set to tag the default vlan (no untagged members) where as general mode the command syntax is normalized like any other vlan.

在与非小型企业产品和第三方供应商进行互操作时，常规模式端口具有更好地工作的倾向，因为配置选项具有灵活性，即您不必指定标记的默认vlan，您可以禁用入口过滤。与中继模式不同，有一个特殊的命令集来标记默认的vlan（没有未标记的成员），其中作为常规模式，命令语法与任何其他vlan一样被规范化。

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