Hi All,
My environment: ACI fabric with two spine and two leaf switches, with both leaf switches attached to two EIGRP routers with all leaf switches and routers in the same AS.
After reading through the ACI L3Out EIGRP support and best practice documentation, I understand that multiple EIGRP L3Outs on the same border nodes are not supported, so I believe that I should be configuring a single EIGRP L3Out with each leaf defined in a Logical Node Profile and with the connected interfaces defined as Logical Interface Profiles beneath their respective node - in my environment I am using SVIs as the routers are physically connected via port-channels.
After configuring the fabric in this way, the L3Out is working as expected, however HELLOs from both leaf switches appear to be also sent out the other leaf switches interface - i.e. from leaf 1 -> via the fabric -> out leaf 2's interface.
This isn't really a problem, and I can understand why it is happening, but it is resulting in lots of "neighbor blocked: not on common subnet" messages being logged on the routers (due to the Logical Interface Profile SVIs using /30's).
Is there any way in which to prevent leaf 1 from trying to establish adjacency via leaf 2's interface, or is there a better design that could be used here (e.g. a single SVI on a VPC spanning both leaf switches)?
Cheers,
-Luke