Data Center decomposition Experiment Four--PC and VPC

Ok,i am back. Experiment 3 studied n5k and briefly reviewed the Port-channel, and continued to introduce a new technology in the data center---vPC (virtual port-channel), a dummy link bundle. Before we mentioned that Port-channel is a physical device at both ends of the VPC, that's not necessarily the case, the classic VPC environment is as follows: A logical entity with a combination of dc2-n5k-1 and dc2-n5k-2 at one end (two vpcs under a VPC domain Peerswitch) and the other end is dc2-n2k-1.

Experimental Logical topology :

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we've done that in the last experiment. n5k between the Po200 interconnection configuration, continue to look at the VPC, you can think, the role of VPC technology is: "So that the n2k to the end of the two n5k is a device," since it is a device that link how to bundle how to converge ~

VPC is used in a more stringent condition, requiring between two n5k

1. There is a piece Peer-link, a two-story link

2. There is a piece Peer-keepalive, a three-story link

3. interconnect hardware is required, software configuration is checked for consistency

Showtime, the experiment begins:

continue to configure VPC,650) this.width=650; "Src=" http://s3.51cto.com/wyfs02/M00/71/3A/wKioL1XJhETjSq8SAANjiI83K74338.jpg " Title= "2.png" alt= "Wkiol1xjhetjsq8saanjii83k74338.jpg"/>

Two devices work together, there will always be a primary and secondary, set rolepriority means to determine the primary and secondary, the VPC within the priority of the device is primary~

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Peer-keepalive is a three-layer accessible interface between two VPC Peer switch:

There are two ways to compare the recommendations,

1. Management interface,

2. dedicated to doing keepalive three-layer interface,

Note: Do not use the cable to back-up connection keepalive three-layer interface

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can see the interfaces on the n2k are registered on the n5k according to the eth103/1/x number.

It is worth noting that since the two devices to be virtual into a single device to use, of course, the configuration of the two devices have requirements, the VPC will verify the consistency of the two devices, and if the check is unsuccessful, the error will be error.

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VPC configuration is not complicated, in fact, the configuration in the data center is not too complicated,

The focus is on the design of the architecture,

The focus is on the design of the architecture,

The focus is on the design of the architecture!

Important thing to say three times ~

What does VPC need us to understand and master the architecture? (Designing a data center that aims to be efficient, easy to scale, easy to maintain, etc.) what are the meanings of learning and designing strange, infrequently used models and architectures? ）

From the device interconnect, the structure you can choose is:

1. The most basic VPC structure (can be n7k connection n5k, or n5k n5k, or n5k even n2k)

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2. enhancedvpc, must be according to our small experiment inside choose n5k even n2k do vpc,n2k in connect to server and do PC

(Because N2k is used as a board card, for the server, although it is connected to two n2k, but the two n2k at the same time belong to two n5k management, so can be regarded as a device)

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3. vpc+, if you run the Fabricpath protocol between two VPC peers, this vPC is called vpc+, and we'll discuss vpc+ in the Fabricpath experiment .

Data Center decomposition Experiment Four--PC and VPC