MPLS VPNs - MPLS VPN Data Plane - Creating VRF FIB Entries for the Ingress PE

3 important questions on MPLS VPNs - MPLS VPN Data Plane - Creating VRF FIB Entries for the Ingress PE

What two labels must the FIB entry support for MPLS VPNs?

-Outer label that identifies the LSP to reach the egress PE
-Inner label that identifies the eggress PE's LFIB entry that includes the correct outgoing interface on the egress PE (the right VRF)

What is the outer label based on?

LIB entry that matches the BGP-learned next-hop IP address

What is the inner label based on?

BGP table entry for the route in the VRF that matches the packet's destination address

The question on the page originate from the summary of the following study material:

  • A unique study and practice tool
  • Never study anything twice again
  • Get the grades you hope for
  • 100% sure, 100% understanding
Remember faster, study better. Scientifically proven.
Trustpilot Logo