thinQmaster Virtual testing partner Adaptive practice exams that find your weak spots and drill them. Every answer explained. From $69
Enroll

thinQmaster

Find your exam

Five questions free, before you decide.

Step 1 · choose a vendor

In one of our camps? Your practice exams come with the tuition — they are on your study page already.

Routing & Switching · Advanced

MPLS Layer 3 VPN (L3VPN)

A provider service (RFC 4364) that carries customer IP routes in separate VRFs across an MPLS core using MP-BGP.

Definition

PEs place customer interfaces into VRFs, learn routes from CEs, export them into MP-BGP as VPNv4/VPNv6 routes with a route distinguisher and route targets, and import them on remote PEs. Data packets carry a VPN label and a transport label. Overlapping customer address space is supported.

Example

show bgp vpnv4 unicast vrf CUST-A

Exam tip

Route distinguisher makes routes unique; route target controls import/export. Swapping them is the most common trap.

Related terms