Hello my seniors Peter Palúch Nick Russo Daniel Dib what will cause Cisco router to fail to boot up after software upgrade even when the boot sequence is set to two iOS. That is if the new iOS fail to boot, the router should pick the second ios image to boot.

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We have a Cisco ASR9K eBGP peering with an upstream Juniper router. BGP session keeps flapping with "hold timer expired". MTUs are same on both devices. The optics are fine with good power levels. Has anyone experience this before? Daryll Swer Daniel Dib Peter Palúch