This may or may not be an issue , In EIGRP if the router rx's an update with its own IP address it will ignore the update, it may be an issue if you have a RID duplicated . Eigrp uses loopback as the RID on external routes , if you have that RID duplicated in another AS it will ignore this update thinking that this is himself.
The router will take the loopback IP that it was assigned first and keep this RID. If you change the loopback it will still retain the original RID until the box is reloaded .
But, typically, you wouldn't see this message for a duplicate router ID, ratehr you'd see an event log message stating an external is ignored because of a dup router ID. This is generally just a case of dup ip addresses on the same segment (hard to do, since Cisc routers defend their IP addresses through gratuitious arps), or a loopback configured under the eigrp routing process that's not marked as passive.
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