Breaking up the supernet at each end
Posted on 2008-10-28
I am a little stumped here and have been reading for an answer all night with no luck, so I thought I would post.
We moved to a new MPLS network with our provider. We have 4 subnets at each location. All /24 bit masks.
LOCATION A, 10.128.0.0,10.128.1.0, 10.128.2.0, 10.128.3.0
LOCATION B, 10.128.4.0,10.128.5.0, 10.128.6.0, 10.128.7.0
So our isp just routed the supernets to each location on the mpls network.
LOCATION A, 10.128.0.0/22
LOCATION B, 10.128.4.0/22
my question is, how do i break them back apart? I have cisco 3725s with 5 FE interfaces at each location. (We are also using ASA5510 for the internet that comes on a different port from our isp, but this is a different topic.)
I know I can assign each subnet to 4 of the FE interfaces, but the transport interface (interface connected to port provided by isp) is where i get confused. do i just assign that an IP address with a 22bit mask (i.e. 10.128.0.2/22) or will it get confused and think its on the same subnet as the other interfaces? i have considered EIGRP, etc, but I don't know if my isp is running any of those protocols and am concerned about the other interfaces being part of the same supernet. The ip address of my providers router at my main site is 10.128.0.1 (they did this to route my networks to me). So it becomes part of the same network of what I have inside.
Any help would be appreciated.