PHP (Penultimate Hop Popping)

CCIE Jan 9, 2011

A label is removed on the router before the last hop within an MPLS domain.

PHP optimises MPLS performance (one less LFIB lookup)

PHP does not work on ATM (Virtual Path Identifiers/virtual channel identifies cannot be removed)

The pop or implicit null label uses a reserved value when being advertised to a neighbor.


Rob Edwards

Northern (UK) chap focusing on platforms, automation, cloud and cloud native applications. Recovering network engineer, although it turns out networking is as important, if not more, now than before!