traceroute 1st hop with dual eigrp uplinks

[stinedvd]

We have all of our distribution switches dual uplinked to our 2 core switches using eigrp.
Each core switch has unique vlan assigned as the eigrp transit/uplink vlan.
When doing a traceroute we see the first hop with each of the core eigrp, but one of the cores ip's shows up twice.
ie:

1 10.1.1.1 4 msec
   10.1.1.10 0 msec
   10.1.1.1 4 msec

Is this normal or do we have something misconfigured with eigrp?  I feel like this is not normal.  Should we have weights on the uplinks to prefer one core over the other, since eigrp sees the FD as the same for each core.

[Jon Marshall · Accepted solution]

It's fine and is expected behaviour. 

Traceroute typically sends out 3 packets so it uses the first path for the first packet, the second path for the second packet and then as you only have two paths it uses the first path again so it is basically just doing round robin between the two paths in the routing table. 

Obviously if you want to prefer one path over the other you would need to influence the metrics. 

Jon