A 911 PSAP MPLS core team wants transit routers that only label-switch packets and never hold VRF or VPNv4 state. Which role correctly describes those devices?
Select an answer to reveal the explanation.
Short Explanation
P routers are the highway trucks that only care about the shipping label on the box — not what’s inside the VRF crate. PE routers are the loading docks that unpack customer VRFs. Keeping 911 core Ps VRF-free keeps the middle simple and fast.
Full Explanation
In MPLS L3VPN, P (provider) routers forward based on the outer transport label and do not store VRF or VPNv4 customer state. PE routers sit at the edge, maintain VRFs, exchange VPNv4 with MP-BGP, and impose or dispose of VPN labels. CEs belong to the customer domain. Isolating VRF awareness to PEs simplifies the PSAP core and matches classic P versus PE role separation.