Routing internally to public IP Space

[kmckaypason]

Hi guys,

I am curious what the norm or suggested practice is for the following scenario:

We have several internet egress points with several data centers interconnected over a private WAN.  Each data center has a variable block of Public IP.

Currently, to connect from one data centers internal IP space to another data center's Public IP space, the connection must leave our network via default route at that site and traverse the internet to reach its end destination.

Is it viable to advertise those Public IP blocks through our IGP so there is no longer a reliance on traversing the public Internet?

Thoughts/Concerns/Comments are appreciated.

Thanks!

Kyle

[nspasov · Accepted solution]

Without knowing much about your environment I will say that it should not be a problem to advertise those IPs via your IGP. I have worked with several customers in the past that have used public IPs inside their network. So routing the public IPs in the private network via IGP is not an issue. The nice thing about doing that is if an issue occurs internally the IGP should withdraw those routes, thus allowing your network to re-converge and use the default route and still be able to reach the remote locations. 

Again, I don't know enough about the environment but it could be something you can quickly mock up in GNS3 and test it out :) 

Hope this helps

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