Multiple IP Unnumbered Loopback interfaces on Cisco 7206VXR (NPE-G1)

Unanswered Question
Sep 10th, 2003

I currently have two 7206VXR routers serving DHCP addresses to several thousand subs. We are in the process of re-IPing the network and want to minimize impact as much as possible.

Can I have two ip unnumbered loopback interfaces active at the same time on one ATM sub-interface? If so we can keep service up for subscribers on the old scope until their lease expires - then they will renew off of the new scope.

Current config below (with fictional IP's)

rbe nasip Loopback10

interface Loopback10

ip address

interface ATM1/0.200 point-to-point

description IMAS DHCP

ip unnumbered Loopback10

ip helper-address

atm route-bridged ip

range pvc 10/33 10/5000

encapsulation aal5snap

I have this problem too.
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didyap Tue, 09/16/2003 - 11:34

I don't think two ip unnumbered statements can be added to the same ATM subinterface. The interface can have secondary IP addresses instead. For details on the ip unnumbered configuration refer


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Posted September 10, 2003 at 1:01 PM
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