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The network administrator notices that IGRP is a long-gone routing protocol; the network has Router R1 which is still using IGRP with AS of 20. A slow migration to EIGRP is intended, without the need for redistribution. What command would allow an easy EIGRP migration?

R1(config)#router igrp merge eigrp 20

R1(config)#no router igrp 20

R1(config)#router eigrp 20

R1(config)#router eigrp 21



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