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MPLS VPN Components basic knowledge

October 24, 2015September 1, 2011 by Shahed

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

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

Virtual Routing and Forwarding basics (VRF)

October 24, 2015September 1, 2011 by Shahed

Virtual Routing and Forwarding basics (VRF):

Today i will discuss about Virtual Routing and Forwarding basics (VRF). VRF is a Layer 3 VPN technique. VRF can be use with or without MPLS. If we look bellow diagram we see here two VRF one is green VRF and another is blue VRF. [boxads]

Virtual Routing and Forwarding basics (VRF) Diagram:

Now one question what is VRF ?

VRF associates to one or more interfaces on PE.
Privatize an interface. [i.e. coloring of the interface in diagram]
Has its own routing table and forwarding table (CEF)
VRF has its own instance for the routing protocol (static ,RIP,BGP,EIGRP,OSPF)
CE router runs standard routing software
PE installs the routes, learned from CE routers, in the appropriate VRF routing table(s)
Also PE installs the IGP (backbone) routes in the global routing table
VPN customers can use overlapping IP addresses.

MPLS VPN Connectivity diagram

October 24, 2015September 1, 2011 by Shahed

MPLS VPN Connectivity diagram:

Today i will discuss about MPLS VPN Connectivity diagram or how a MPLS VPN domain buildup in service provider environment. [boxads]

MPLS VPN domain are consist mainly P & PE router. P router means provider router, and PE router means provider edge router. P router are only forwarded Level & PE router collect & distribute customer prefixes. If we look bellow diagram we see P & PE router how connected.

MPLS VPN Connectivity diagram: