County courts staff suspect a departmental VPN is down. What should they verify before blaming PE-CE routing?
Select an answer to reveal the explanation.
Short Explanation
If the LSP across the core is broken, the VPN never had a chance. Check the label-switched path end-to-end before you dig into PE-CE neighbors. Underlay first, overlay argument second.
Full Explanation
MPLS VPN traffic depends on a working transport LSP between PE routers. Validating LSP continuity isolates whether the failure is an underlay label-switching problem versus a PE-CE or VRF routing issue. User-VLAN ARP alone, unrelated wireless certificates, or expecting full Internet tables on every P router are not the prerequisite checks for VPN LSP health.