Cisco has stopped support for IGRP in current versions of IOS. Is it possible to load an older version of IOS on the new router that does include support for IGRP?
If you can not get the new router back to a version that supports IGRP then I do not see much alternative to making some change on the other (old) router and the easy solution would be to have the other router run EIGRP.
HTH
Rick
HTH
Rick
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