For 3745, IP Plus (i.e. IP PLUS IPSEC 3DES to get DLSw and 3DES) supports DLSw. For 1720, you need IOS with IBM feature (i.e. IP/IPX/AT/IBM/FW PLUS IPSEC 3DES to get 3DES and DLSw) set to support DLSw.
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