General vs Trunk Mode

General vs Trunk Mode

General vs Trunk Mode (正常模式 與 中繼模式 比較 )

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上試運作了正常模式和中繼模式，我正在尋找通用模式和中繼模式之間的差別，并找到了以下解釋：

• General mode allows multiple untagged vlans and also multiple  tagged vlans to exist on the same switch interface. 正常模式允許多個未标記的VLAN，也可以在同一交換機接口上存在多個标記的VLAN。
• Trunk mode allows ONE untagged vlan and multiple Tagged vlans to exist on the same switch interface. 中繼模式允許在同一交換機接口上存在一個未标記的VLAN和多個标記的VLAN。
• Access mode allows only one untagged vlan to exist on a switch interface. 通路模式僅允許在交換機接口上存在一個未标記的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，交換機在正常模式下到底如何區分多個未标記的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.

本機VLAN仍适用于正常模式。 雖然在正常端口上可以有多個未标記的VLAN，但您隻能有一個（1）PVID。 PVID代表原生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.

未标記的流量可能會通過多個未标記的VLAN發送，傳回的未标記的流量隻會由PVID接收，是以不會轉發到特定的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.

中繼端口将具有無法禁用的隐式入口過濾器。 正常端口可能禁用了入口過濾器，進而使其成為更真實的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.

在與非小型企業産品和第三方供應商進行互操作時，正常模式端口具有更好地工作的傾向，因為配置選項具有靈活性，即您不必指定标記的預設vlan，您可以禁用入口過濾。與中繼模式不同，有一個特殊的指令集來标記預設的vlan（沒有未标記的成員），其中作為正常模式，指令文法與任何其他vlan一樣被規範化。

========== End