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Why is MPLS signaling protocol LDP Flapping?

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TitleWhy is MPLS signaling protocol LDP Flapping?
Question
Why is MPLS signaling protocol LDP constantly flapping? 
Environment
Summit ALL
Black Diamond ALL
EXOS 21.1.1.4
MPLS
Answer
If iproute compression and iproute mpls-next-hop are enabled, LDP keep alive packets are getting dropped.  This is a software bug covered under CR # xos0064699.

The issue is still under investigation.  Please review CR for future software fixes.

Workaround: Either disable iproute mpls-next-hop feature or disable iproute compression. 
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