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Will new loopback int INSTANTLY change EIGRP router id?

Hello.

If there exists no explicitly configured EIGRP router-ID, and also there exists no loopback interface...

... will the device's EIGRP router-ID advertised to a neighbor instantly change to the loopback interface, or must some reset command (or reboot) be executed to change this dynamic router ID to the newly inserted loopback interface?

Thank you.

1 Accepted Solution

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M02@rt37
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Hello @jmaxwellUSAF,

If you later add a loopback interface with a higher IP address than the previously selected router ID, the EIGRP router ID will not automatically change to the new loopback interface address. The router ID remains the same unless you manually configure it with a new value or reset the EIGRP process.

clear ip eigrp neighbor
Best regards
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2 Replies 2

M02@rt37
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Hello @jmaxwellUSAF,

If you later add a loopback interface with a higher IP address than the previously selected router ID, the EIGRP router ID will not automatically change to the new loopback interface address. The router ID remains the same unless you manually configure it with a new value or reset the EIGRP process.

clear ip eigrp neighbor
Best regards
.ı|ı.ı|ı. If This Helps, Please Rate .ı|ı.ı|ı.

Also, if the existing interface goes down, RID would be reselected.

Reason why loopback or configured RID recommended, neither subject to change due to interface, unintended, status change.  Loopback interface recommended as you can route to it.

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