Showing posts with label MPLS L3 VPN. Show all posts
Showing posts with label MPLS L3 VPN. Show all posts

How to configure MPLS L3 VPN with RIPv2 ?

Internetworks


In MPLS Layer 3 the service provider will participate in routing with the customers. The customers will run static, OSPF, EIGRP, BGP, or any other routing protocol with the service provider; these routes can be shared with other sites of the customers.


In VPN routing information from one customer is completely separated from other customers and tunneled over the service provider MPLS network.



we have already discussed what is MPLS? how MPLS work? and What is MPLS L3 VPN ? in this section we see how to configure MPLS L3 VPN supports RIPv2. Before we start our configuration you must familiar with these topics.


What is MPLS L3 VPN ? How to configure?

Internetworks

We already discuss what is MPLS and LDP in the previous sections. In this section, we will see what is MPLS L3 VPN? And what are VRF (virtual routing forwarding), Rd (route-distinguisher), RT (route-target), and how to configure MPLS L3 VPN in the service provider network?






In MPLS Layer 3 the service provider will participate in routing with the customers. The customers will run static, OSPF, EIGRP, BGP, or any other routing protocol with the service provider; these routes can be shared with other sites of the customers.

In VPN routing information from one customer is completely separated from other customers and tunneled over the service provider MPLS network.

What is VRF (virtual routing forwarding)?


Virtual routing forwarding VRF provides a way for us to configure multiple routing instances on our router.  We use multiple routing tables. Each customer of the service provider will use a different VRF. VRF keeps customer traffic and routing separate utilizes the same hardware.  Without VRF we need to use ACL filtering to keep traffic segregated.


What is Rd (route-distinguisher?)


Route-distinguisher is used to convert a client non-unique 32-bit address into a unique 96-bit vpnv4 address, to enable transport between PE routers and the resulting address is a vpnv4 address. RD is locally significant to a router. VRF is not operational unless you configure an RD.



We can use any value we want but we use the ASN: NN format where ASN means the service provider’s AS number and NN is a number we pick that identifies the site of the customer. Each VRF in a PE router must have a unique RD.

RT (Route-Target)

Is a 64-bit extended BGP community that is attached to aVPNv4 BGP route to indicate its VPN membership?
Any number of RTs can be attached to a single route.

Export RTs

1.       Identifies the VPN member to which the associated VRF belongs.
2.       2. Are attached to a client’s route, when it is converted into a VPNv4 route.

 Import RTs

1. Import RT is used to select which VPNv4 routers is to be inserted into which VRF tables.
2. on the receiving PE router, a route is imported into a VRF only if at least one RT attached to the route matches at least one import RT configuration in that VRF.