I swaped RSP 1 to RSP 3 on  The ASR-903 with RSP-1 can handle IMA1X in slot 0 and 1 and 2, when we swap to RSP3 the IMA1X is handled only in slot 0 and slot 4 if we use IMA8S and IMA8S1Z on all slots refering to cisco documentation, but when we apply this rule IMA1X does not work on slot 4 the version used is 3.18 this is a view for commande : show version  ME-XXXXXXX-01#sh version Cisco IOS XE Software, Version 03.18.04.SP.156-2.SP4-ext Cisco IOS Software, ASR900 Software (PPC_LINUX_IOSD-UNIVERSALK9_NPE-M), Version 15.6(2)SP4, RELEASE SOFTWARE (fc4) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2018 by Cisco Systems, Inc. Compiled Mon 19-Mar-18 23:18 by mcpre Cisco IOS-XE software, Copyright (c) 2005-2018 by cisco Systems, Inc. All rights reserved. Certain components of Cisco IOS-XE software are licensed under the GNU General Public License ("GPL") Version 2.0. The software code licensed under GPL Version 2.0 is free software that comes with ABSOLUTELY NO WARRANTY. You can redistribute and/or modify such GPL code under the terms of GPL Version 2.0. For more details, see the documentation or "License Notice" file accompanying the IOS-XE software, or the applicable URL provided on the flyer accompanying the IOS-XE software. ROM: IOS-XE ROMMON ME-CAS-0024-01 uptime is 6 weeks, 6 days, 11 hours, 57 minutes Uptime for this control processor is 6 weeks, 6 days, 11 hours, 59 minutes System returned to ROM by reload System restarted at 02:22:52 UTC Fri May 10 2019 System image file is "bootflash:/Image2/packages.conf" Last reload reason: Reload Command   This product contains cryptographic features and is subject to United States and local country laws governing import, export, transfer and use. Delivery of Cisco cryptographic products does not imply third-party authority to import, export, distribute or use encryption. Importers, exporters, distributors and users are responsible for compliance with U.S. and local country laws. By using this product you agree to comply with applicable laws and regulations. If you are unable to comply with U.S. and local laws, return this product immediately. A summary of U.S. laws governing Cisco cryptographic products may be found at: http://www.cisco.com/wwl/export/crypto/tool/stqrg.html If you require further assistance please contact us by sending email to export@cisco.com. License Level: metroaggrservices License Type: Permanent Next reload license Level: metroaggrservices cisco ASR-903 (RSP3_200) processor (revision RSP3_200) with 925515K/6147K bytes of memory. Processor board ID FOX1739P1L7 16 Gigabit Ethernet interfaces 2 Ten Gigabit Ethernet interfaces 32768K bytes of non-volatile configuration memory. 8388608K bytes of physical memory. 5703875K bytes of eUSB flash at bootflash:. Configuration register is 0x2   ... View more