While any issue with TCP might bring down the BGP and LDP session, I dont think it should affect or brign down ISIS session. It appears that the control plane protocols lost the packet and so the session.
What error did you see for BGP/ISIS and LDP while bringing the session to neighbor(s) down?.
This document is an early notification of a behaviour change that will be introduced in IOS XR release 6.5.
IOS XR configuration principles relevant for this article are:
On router platforms all interfaces must be by defaul...
With XR 4.2.0 the ASR9000 is releasing a new line of hardware models. This amongst others is the RSP440, the next generation RSP with faster switch fabric along with Typhoon based Linecards, the next generation network processor.
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