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After replacing a Summit X670 with a Summit X670G2 Penultimate Hop Popping no longer works.

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TitleAfter replacing a Summit X670 with a Summit X670G2 Penultimate Hop Popping no longer works.
Symptoms
After replacing a Summit X670 with a Summit X670G2 Penultimate Hop Popping no longer works.
Environment
  • X670G2, X770
  • All EXOS
Cause
Due to a hardware limitation the Summit X670G2 does not support Penultimate Hop Popping.
Resolution
Configuring the Label Edge Router to advertise an explicit NULL in place of the implicit NULL can be performed to eliminate Penultimate Hop Popping on the penultimate switch.
Additional notes

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