Public IP Allocation

[uk26]

we have a /22 IPv4 and a /29 IPv6 and are about to plan the assignments

Background
We operate in two Data Centres of which are connected via a 20GB Fibre Ring

We can effectively route IPs between data centres without changing the routing of the IP Block

My understanding is we can setup Ripe Route for the /22 and announce with upstream providers so soon as we allocate future blocks out of the /22 allocation for customers etc that they are live right away without waiting for upstream to announce every new allocation.

If the above is correct, I shall allocate /24 for internal hardware across the two data centres with the remaining for customer allocations.

 

[James Ormerod]

Yes, you can advertise the /22 to your upstream providers and subnet into smaller allocations on your network

 

[uk26]

Excellent and that does not require us to assign all our /22 address space at once with ripe?

 

[James Ormerod]

Thats up to you. You can or you can split them up. For example, I have a /19 but a /24 of that is advertised on a network in asia. It's all down to how you advertise the blocks.

 

[uk26]

OK Thanks

Initially our upstream provider will announce our IP Space for us to avoid the immediate need to worry about BGP. they are very well connected and not had any network outages in 3 years so not too fussed about adding multi-homed yet.

If done correctly is there any downtime in converting to a multi-homed / BGP Setup in the future?

 

[James Ormerod]

If they manage the changover right, less than a minute whilst the arp tables update and the BGP routes advertise.

 

[uk26]

Cool, fantastic. Thanks for the help James.

 

[uk26]

another small question,

been playing with the RIPE Test Database.

So lets assume, we have a ip subnet of 172.16.100.0/22

On setting up the routing of the IP Space, example below

route: 172.16.100.0/22
descr: test
origin: AS103
mnt-by: TEST-DBM-MNT
created: 2015-12-13T10:04:15Z
last-modified: 2015-12-13T10:04:15Z
source: TEST

on the live Database, would it allow us to assign our providers AS-Number (origin) or would they have to setup the route for us? dont want to make any errors on the live DB

 

[James Ormerod]

Correct and the provider will then need to also advertise your IP's in their BGP.
Consider using smaller subnets in ripe too if you may need a /23 or /24 pointing to another provider in the future as it will save you re-subnetting. For example we have a couple of /19's but subsetted into /24's in the ripe db.

 

[uk26]

Sorry you said correct to my question but not sure if we can add the providers as number or will I need to list route-mtr to the ip subnet and get them to add it

 

[James Ormerod]

I could be wrong but from memory, I think your provider has to be a maintainer for your objects. Might be worth doing this anyway as they will do it all for you

 

[uk26]

All setup and working / live on the internet thanks for the help.

 

[uk26]

how long does it take for the BGP update to reach every network? reason i ask is some networks can see our IP Range and some cant.

 

[uk26]

all appears to be up now to every network tested.