IP addressing scheme for Data Center

[s0chia-Cisco]

Hello,

I'm working for a big Project related to Data Center design and I'm not able to figure out how design new IP addressing scheme. Is there some template or some rule to do it?

do exist some book on this argument or some Cisco link?

I have some idea like using /16 i.e. 10.0.0.0/16

DMZ 172.16.43.0/24

MGMT 10.0.VLAN ID.0

Please advice me. I feeling stuck on this topic.

Any information will be appreciate.

s0chia

[GRANT3779]

Hi s0chia,

From a higher level - what we have done is the following.

We have many sites across many countries and we have assigned a /16 to each country. We have matched the 2nd Octet to (or as close as we can to the Country's International Dialling Code), e.g

10.44.0.0 /16  - UK (+44 is the UK Dialling Code)

10.49.0.0 /16 - Germany (+49 is the German Dialling Code)

10.7.0.0 /16 - Russia (+7 is the Russian Dialling Code)

Some of our sites/countries have 3 digit dialling codes, e.g Oman is +968). We use the first two numbers in these cases.

e.g 10.96.0.0 /16

This has worked well for us.

At a lower level, where we have multiple sites in a country we then assign a subset of the /16 to each site,

e.g

UK site 1 - 10.44.0.0 /17

UK Site 2 - 10.44.128.0 /20

UK Site 3 - 10.44.144.0 /20

At site level we have then assigned a mix /24s /25s and so forth for Management, Data, Voice, Servers, Storage, Printers etc. This is where you would need to tailor things your own needs.

We also try and keep the vlan names and numbers consistent across all our sites to keep everything to a standard.

Hopefully that has been of some help or given you some thoughts of how to do things.

[s0chia-Cisco]

Hi GRANT3779,

sorry for delay but I was in vacation.

First of all let me thank you.

Might you exaplin better the concept with some scenarios like you dd (but for me is still partial).

As example I'll take London

10.44.0.0/16 (do you think /16 for I don't know 1000 Offices in UK it's enough?)

could you show me a real example using one site with

MGMT Vlan

Voice

Wireless

MPLS

Loopback interfaces

Server

Storage

and do you think 10.10.128.0 /20 is enough for another site in UK?

to me it looks not enough..For sure I don't have great skill on subnetting.

Please help me on this topic.

I'll really appreciate it.

[GRANT3779]

Hi,

It really is a difficult question to answer. What works for one company could be totally unsuitable for another. There are a lot of variables at play that can differ drastically, e.g, at a very high basic level

Current number of Countries you have offices in
Current number of offices within each Country

Current number of devices in each office

Current numebr of users in each office

A lot of the lower level decisions on segmentation, vlans etc.. will probably be led by your company security policy etc..

Note also that I use the word current, which is important, as you need to also plan for scalabiltiy and look forward as much as you can. Once you have the current info, you would then need to plan for potential future projections and account for all this.

I really just provided an example of what we done. It wasn't just quickly pulled together and was based on current and potential future plans. There may come a time when we have to start tweaking things here and there and fall slightly wayward of our original plan if / when the unexpected happens.