I encountered the strangest issue the other day. I have a 4510R switch that is talking EIGRP with 2 WAN routers. The routers and vlan 2 on the switch are in the 10.25.4.0 subnet. We connected two DL585 G2 servers to the switch and put those switch ports in vlan 6 which is the 10.26.1.0 subnet. The servers had not yet been configured with an IP address.
All of a sudden, the switch lost all connectivity to my other sites. In the log, I saw these error messages:
Neighbors 10.25.4.6 and 10.25.4.6 are my WAN routers.
As soon as we configured the servers with IP addresses (in the 10.26.1.0 subnet/vlan 6), the problem resolved.
I have never seen this before with any other servers. We have connected servers to the switch and put them in a different vlan prior to assigning an IP plenty of times without any issues. This is the first time we have used the DL585s. Any ideas about what might have been going on? Thanks.
EIGRP uses multicast, which is independent of normal network addressing. Even if the two network devices have two network addresses in different subnets, they will still hear one another's eigrp announcements if they are running an eigrp process.
Ok. I asked my server guy and he confirmed that he did have both NICs connected. One was in vlan 2 and one was in vlan 6. Yes, 10.25.4.7 and 10.25.4.6 are the routers. The servers did not have any ip addresses at the time. Thanks.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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