May 23, 2024

MPLS VPN Components basic knowledge

MPLS VPN Components:

Today I will discuss about MPLS VPN Components. It is same as MP-BGP Components. only extra Label component are added with MPLS VPN Components. [boxads]

  • RD: Route Distinguisher
  • VPNv4 routes
  • RT: Route Target
  • Label
MPLS VPN Components
MPLS VPN Components

VPNv4 address:

  • To convert an IPv4 address into a VPNv4 address, RD is appended to the IPv4 address i.e 1:1:10.1.1.0 Makes the customer’s IPv4 route globally unique.
  • Each VRF must be configured with an RD at the PE. RD is what that defines the VRF   [adsense]

Example:

ip vrf v1
rd 1:1

VPNv4 Address
VPNv4 Address

Route-Target: 

  • Route-target (RT): Identifies the VRF for the received VPNv4 prefix. It is an 8-byte extended Community (a BGP attribute).
  • Each VRF is configured with RT(s) at the PE. RT helps to color the prefix.

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Example:

ip vrf v1
route-target import 1:1
route-target export 1:2

Route-target (RT)
Route-target (RT)

Label:

  • The Label (for the VPNv4 prefix) is assigned only by the PE whose address is the Next-Hop attribute, PE routers re-write the Next-Hop with their own address (loopback). “Next-Hop-Self” towards MP-iBGP neighbors by default.
  • PE addresses used as BGP Next-Hop must be uniquely known in the backbone IGP

           DO NOT summarize the PE loopback addresses in the core

Label
Label

Shahed

Hi! I am Shahed Israr. I try to help GPON Technology users with their queries and provide them with relevant and accurate information to the best of my ability. My main goal is to assist and enhance GPON Technology user and help people find the answers they're looking for quickly and easily.

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Shahed

Hi! I am Shahed Israr. I try to help GPON Technology users with their queries and provide them with relevant and accurate information to the best of my ability. My main goal is to assist and enhance GPON Technology user and help people find the answers they're looking for quickly and easily.

View all posts by Shahed →

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