My company did a system wide cutover from EIGRP to OSPF last night. This was driven primarily by interoperability between different vendors and the desire to eliminate redistribution in the network. In an attempt to have an easy backout procedure we just shutdown the EIGRP process and let the routes fall back to OSPF. If something went horribly wrong we could just no shut the EIGRP process while we figured out what happened. The entire cutover was seamless with no downtime whatsoever EXCEPT for one device.
When I shut down EIGRP on an ASR1001-X everything failed over seamlessly. A few minutes later I get a text alert that this ASR has gone offline. Sure enough no reachability. I hop onto the core and the links to the ASR are hard down. A few minutes later the ASR comes back online.
Last reload reason: Critical software exception, check bootflash:crashinfo_RP_00_00_20180911-182746-CENTRAL
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