Two hubs same organization routing table.

[JamesMutie]

Since hubs within the same organization peer to each other automatically, will this cause a problem with crushing spoke IP subnets in different networks? 

Lets say spoke 1 peering with Hub 1  doesn't  need to communicate with spoke 2 peering with Hub 2.  Spoke 2 has similar IP Subnet like spoke 1. Am suspecting spoke 1 return traffic from hub 1 might be send to hub 2  hence causing a blackhole. Is this case. ? if for example spoke 2 decides to advertise a more specific route to HUB2.

I  am designing  for  several Hubs in one organization and each hub has over 30 networks. And there is possibility of similar IP Subnets in some networks

[cmr]

There is an option to translate remote subnets to different ones in this case, but I'd always go for renumbering despite the initial pain.

[JamesMutie]

@cmr  Thanks,

Renumbering is changing the IP addresses to different ones right.

[cmr · Accepted solution]

@JamesMutie yes, if you have two sites that both use, for example, 192.168.0.0/24, then change one to use a different range like 10.12.3.0/24.

If you move to the 10. range you can create almost as many sites as you like as there are 255 /16 networks with easy subdivisions to /24 (where you have large sites) or over 65,000 /24 networks.

You don't need to move all, just the ones that overlap.