Trace LIFO label operations across the ISP core.
Simulate Push/Pop/Swap label operations (LIFO) with optional penultimate hop popping (PHP).
Ingress — receive
Inbound IPv4 payload (no MPLS labels yet)
Stack: [empty]
PE-ingress — push
Push label 16001 onto stack (LIFO)
Stack: [16001]
P-core — push
Push label 24002 onto stack (LIFO)
Stack: [16001 → 24002]
P-core-2 — swap
Swap top label 24002 → 24003
Stack: [16001 → 24003]
P-core-2 (PHP) — pop
PHP — Pop transport label 24003; penultimate P-router sends IP/imlabel only to PE
Stack: [16001]
PE-egress — pop
Pop label 16001
Stack: [empty]
Final label: none (IP/imlabel only)
PHP auto-pop inserted before egress PE.
MPLS Label Stack Visualizer helps you trace lifo label operations across the isp core. It is commonly used by network admins, IT support teams, ops engineers for mpls label stack, php mpls, push pop swap.
Educational hop-by-hop stack state for Push, Pop, Swap, and PHP.