Lecture 126: Transit VIF

lecture-126.md

课程：[NEW] AWS Certified Advanced Networking Specialty 2026
视频时长：03:00
来源：Udemy Lecture 39623052
Slide 数量：10
画面切换：00:25、00:44、01:01、01:22、01:30、01:47、02:10、02:28、02:36

扫描说明

逐条检查了 Udemy 页面中的 60 条 Transcript cue，并以每条 cue 对应画面扫描了全长约 3:00 的视频。依据 Transit VIF 功能清单的逐步呈现、多 Transit Gateway 共享一个 DXGW、多 DXGW 连接一个 Transit Gateway，以及 ASN 标注，共划分为 10 个小节。正式截图均在锁定 Lecture 39623052、Autoplay 关闭、视频播放且底部控件隐藏后，按完整媒体边界截取并输出为 1364×770，逐张复核了左右与底部边界。

Transcript 来自 Udemy 页面自带的英文自动字幕，没有使用 ASR。下面保留页面原文，包括其中的语法或识别错误。

1. Transit VIF 概览

时间范围：00:00–00:25

Transit VIF title slide

总结 / Summary

中文

传输虚拟接口（Transit Virtual Interface, Transit VIF）是 AWS Direct Connect 与 AWS Transit Gateway 集成时使用的 VIF 类型。

English

A Transit Virtual Interface (Transit VIF) is the VIF type used to integrate AWS Direct Connect with AWS Transit Gateway.

Transcript

00:00 Hi.

00:01 as of now, we have seen the public VIF and a private VIF.

00:04 Now let's quickly talk about the Transit VIF.

00:07 And then in the following lectures,

00:08 we will see architectures using the Transit VIF

00:12 and private VIF along with the DirectConnect Gateway.

00:15 So in this lecture,

00:16 we will just cover the features and then

00:18 we'll dive deep into the following lectures.

00:21 So as you already know,

00:22 Transit VIF allows the connectivity between

2. 连接 Direct Connect 与 Transit Gateway

时间范围：00:25–00:44

Transit VIF connects Direct Connect and Transit Gateway

总结 / Summary

中文

Transit VIF 在 Direct Connect 连接与区域级传输网关（Transit Gateway, TGW）之间建立网络连接；TGW 位于客户 AWS 账户内且本身属于特定区域（Region）。

English

A Transit VIF connects a Direct Connect connection to a Regional Transit Gateway (TGW) in the customer's AWS account.

Transcript

00:25 the DirectConnect and the Transit Gateway

00:27 and this Transit Gateway will be inside your AWS account.

00:31 And as you know, Transit Gateway are the Region routers,

00:34 that means every Region would have the Transit Gateway,

00:37 they can't go across the AWS Region.

00:40 And we will again talk about this architecture shortly.

3. Transit VIF 必须经由 DXGW

时间范围：00:44–01:01

Transit VIF attached to a Direct Connect Gateway and then a Transit Gateway

总结 / Summary

中文

连接路径为：先创建 Direct Connect 网关（Direct Connect Gateway, DXGW），把 Transit VIF 附加到 DXGW，再将 DXGW 与 Transit Gateway 关联。

English

The path is built by creating a Direct Connect Gateway (DXGW), attaching the Transit VIF to it, and then associating the DXGW with the Transit Gateway.

Transcript

00:44 Now,

00:45 the way you connect Transit Gateway to the DirectConnect is

00:48 that first you have to provision the DirectConnect Gateway,

00:51 create a Transit VIF attached to the DirectConnect Gateway.

00:55 And then you can associate DirectConnect Gateway to

00:58 the Transit Gateway in your AWS account.

4. MTU 1500 与 Jumbo Frame 8500

时间范围：01:01–01:22

Transit VIF MTU 1500 and jumbo frame 8500

总结 / Summary

中文

Transit VIF 默认最大传输单元（Maximum Transmission Unit, MTU）为 1500 字节，并可显式启用 8500 字节巨型帧（jumbo frame）；这不同于 Private VIF 的 9001 字节。

English

A Transit VIF uses a 1,500-byte MTU by default and can explicitly enable 8,500-byte jumbo frames, rather than the 9,001-byte size supported by a Private VIF.

Transcript

01:01 Now, with respect to the Jumbo frames,

01:04 you know that on a private VIF,

01:06 you can enable the Jumbo frame of 9001 byte

01:10 but in case of Transit Gateway and Transit VIF,

01:13 you can support 8500 byte size of the Jumbo frames.

01:18 And you have to explicitly enable this while creating the Transit VIF.

5. 一个 DXGW 关联多个 Transit Gateway

时间范围：01:22–01:30

Multiple Transit Gateways attached to one Direct Connect Gateway

总结 / Summary

中文

一个 DXGW 可关联位于不同 AWS 区域（AWS Region）的多个 Transit Gateway，从而让同一 Direct Connect 路径服务多区域网络。

English

One DXGW can associate with multiple Transit Gateways in different AWS Regions, allowing one Direct Connect path to serve a multi-Region network.

Transcript

01:22 Now,

01:22 you can also attach multiple Transit Gateway to a single DirectConnect Gateway.

01:27 So if you want to see how it looks,

6. 多 Region Transit Gateway 拓扑

时间范围：01:30–01:47

One Direct Connect Gateway connected to multiple Regional Transit Gateways

总结 / Summary

中文

拓扑图展示企业数据中心经 Direct Connect、Transit VIF 与单一 DXGW，扇出到多个区域中的 Transit Gateway 和 VPC。

English

The diagram shows a corporate data center reaching Transit Gateways and VPCs in multiple Regions through Direct Connect, a Transit VIF, and a single DXGW.

Transcript

01:30 now, this is a DX connection

01:33 and there is a Transit VIF, you attach that to a DirectConnect Gateway

01:37 and then you can associate multiple Transit gateways across

01:41 different AWS Region to the same DirectConnect Gateway.

7. 一个 Transit Gateway 关联多个 DXGW

时间范围：01:47–02:10

Multiple Direct Connect Gateways attached to one Transit Gateway feature

总结 / Summary

中文

反向也成立：单个 Transit Gateway 可关联多个 DXGW，适合多个客户站点或多个 Direct Connect 位置共同访问同一区域 VPC 的架构。

English

Conversely, one Transit Gateway can associate with multiple DXGWs, supporting architectures where multiple customer sites or Direct Connect locations reach VPCs in one Region.

Transcript

01:47 You can also attach multiple DX gateways to a single Transit Gateway.

01:53 Now again, this is an architecture pattern

01:56 where you have multiple customer sites and all sites needs

02:01 to communicate with your VPCs in a particular Region.

02:04 For example,

02:05 in that case, you can set up the architecture

02:08 which does this

8. DXGW 与 TGW 的 ASN 必须不同

时间范围：02:10–02:28

Direct Connect Gateway and Transit Gateway require different ASNs

总结 / Summary

中文

Direct Connect 网关与 Transit Gateway 的自治系统编号（Autonomous System Number, ASN）必须不同；若两者都使用默认 ASN 64512，关联会失败。

English

The Direct Connect Gateway and Transit Gateway must use different Autonomous System Numbers (ASNs); association fails if both use the default ASN 64512.

Transcript

02:10 and just one more thing to remember is that

02:13 because there are now 2 gateways,

02:15 Transit gateway and DX gateway,

02:17 you have to make sure that the AS Numbers for those are different.

02:22 Otherwise you can't associate these two gateways together, right?

02:26 And

02:27 what I mean by that?

9. 多 DXGW 到单 TGW 拓扑

时间范围：02:28–02:36

One Transit Gateway connected to multiple Direct Connect Gateways

总结 / Summary

中文

拓扑图展示同一区域内的 Transit Gateway 通过两个 DXGW 和两条 Transit VIF 连接两个企业站点。

English

The diagram shows one Regional Transit Gateway connecting to two corporate sites through two DXGWs and two Transit VIFs.

Transcript

02:28 So this is an architecture where you are

02:32 connecting multiple DX gateways to the same Transit Gateway.

10. ASN 标注与关联校验

时间范围：02:36–03:00

Different ASN labels for Transit Gateway and Direct Connect Gateways

总结 / Summary

中文

图中将 TGW 标为 ASN X、两个 DXGW 标为 ASN Y 与 ASN Z，直观说明每次 TGW–DXGW 关联的 ASN 必须不同。

English

The diagram labels the TGW as ASN X and the two DXGWs as ASN Y and ASN Z, illustrating that each TGW-to-DXGW association must use different ASNs.

Transcript

02:36 And with respect to the ASN it should be different when you associate

02:41 Transit Gateway and the DX Gateway.

02:44 So those are the things to remember for Transit VIF and the Transit gateways.

02:49 And I hope that is clear.

02:50 And now in the following lectures,

02:52 we will dive a little deeper into

02:54 the DirectConnect Gateway and some more architectures.

02:57 Thanks for watching and stay tuned.

整讲总结 / Overall Summary

中文

Transit VIF 通过 Direct Connect 网关（Direct Connect Gateway, DXGW）把 AWS Direct Connect 与区域级 Transit Gateway 连接起来。一个 DXGW 可关联多个区域的 TGW，一个 TGW 也可关联多个 DXGW。Transit VIF 默认 MTU 为 1500，可启用 8500 字节巨型帧（jumbo frame）。架构设计时必须确保相互关联的 DXGW 与 TGW 使用不同的自治系统编号（Autonomous System Number, ASN）。

English

A Transit VIF connects AWS Direct Connect to a Regional Transit Gateway through a Direct Connect Gateway (DXGW). One DXGW can associate with multiple Regional TGWs, and one TGW can associate with multiple DXGWs. Transit VIFs use a 1,500-byte MTU by default and support 8,500-byte jumbo frames. Every associated DXGW and TGW must use different ASNs.

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