With a public block of IPs, can I use multiple ISPs on an ASA

[Lameth]

My company has tasked me with shutting down our datacenter and moving everything into one of our sites.  Currently the datacenter supplies us with a /24 block and I would like to replicate this at one of our sites.  However, the datacenter supplies us with multi ISP which is something I can not get.  At my site, I have 2 ISPs using SLA for failover.  Each have their own block of IPs and each provide me a /27 so I can do limited outbound natting.  If I were to lease a /24 block of IPs, What would I need to do with these carriers and IPs to make this work? 

This is all through an ASA 5525x.  Would it be a matter of enabling BGP with the ISPs?  (right now as we do not have a lot of routes, everything is static and has been great for years).  If I am leasing the IPs internally, would I need to apply for an AS # for my company?  I am just not sure where to start with this.

Thanks

[MHM Cisco World]

The new location can ISP advertise these public IP (from old DC)?

MHM

[Lameth]

The current datacenter IPs are owned by the datacenter and are not transferable.  I think that's what your are asking?

[Richard Burts]

There are things about your environment that we do not know and that impacts our ability to give good advice. If you have a /24 block of addresses I would have thought you could advertise them from a different data center. I am not clear why the IPs are not transferable. But if they are not transferable then it seems that you are stuck with what you have got.

[Lameth]

I think perhaps I explained incorrectly.  Lets ignore the transfer from a datacenter.  I currently have 2 ISPs at my location both connected to a single ASA 5525.  Currently I use static routes and SLA to handle fail over.  If I acquire a /24 subnet, how with the ASA 5525 would I be able to use this /24 across both ISPs?

[Richard Burts]

Thanks for the clarification. If you acquire a block of /24 Public IPs then you would run BGP on your ASA and advertise your block of addresses to both ISP. And if you need to move to a different location then you would run BGP from the new location and advertise your Public IPs from the new location.

[Lameth]

that's kind of what I was thinking.  Now with this setup, my company would need to acquire an AS#  , I wouldn't be able to go off of the ISPs ?