EIGRP Load Balancing Using 10G Interfaces

[zekebashi]

Hello all!

I have an EIGRP Load Balancing challenge!!

I've recently deplyed a second NX7K chassis to provide redundency in our network. Everything went all except for one minor EIGRP Load Balancing issue that I am facing.

Here's the setup:

VSS_6509_Pair
- Po2101 L2 (2x10G interfaces) connected to NX7K1
- Po2102 L2 (2x10G interfaces) connected to NX7K2
- VLAN 682 --- SVI: VLAN682 10.26.60.17/30 to pair EIGRP with NX7K1
- VLAN 683 --- SVI: VLAN683 10.26.60.81/30 to pair EIGRP with NX7K2

NX7K1
- Po2101 L2 (2x10G interfaces) connected to VSS_6509_Pair
- Po3 L3 (1x10G inteface) connected to NX7K2
- VLAN 682 --- SVI: VLAN682 10.26.60.18/30 to pair EIGRP with VSS_6509_Pair
- VLAN 1682 --- SVI: VLAN1682 10.26.60.100/30 to pair EIGRP with NX7K2

NX7K2
- Po3 L3 (1x10G inteface) connected to NX7K1
- Po2102 L2 (2x10G interfaces) connected to VSS_6509_Pair
- VLAN 683 --- SVI: VLAN683 10.26.60.82/30 to pair EIGRP with NX7K2
- VLAN 1682 --- SVI: VLAN1682 10.26.60.101/30 to pair EIGRP with NX7K1


- EIGRP is running on all three swtiches as the routing protocol

The problem I am facing is that the path selected from NX7K2 to one of the subnets/network on VSS_6509_Pair is through the single 10GB(L3) which takes two hops rather than the L2(2x10G) direct connection to the VSS_6509_Pair.

I don't understand why the NX7K2 would prefer the route through the single 10G(L3) rather than the direct dual 2x10G L2 links to the VSS_6509_Pair!!

Thanks in advance.

~zK

[Reza Sharifi]

Hi,

Is this only happening on NX7K2?

Does NX7K1 forwards traffic directly to VSS?

How about from VSS to both Nexus?

HTH

[Francesco Molino]

Hi

Could you give the output of sh ip route for this subnet and the sh ip eigrp topology for thia subnet?

And also a sh ip eigrp interface detail on all peering interfaces 

Thanks