MPLS L2VPN Service

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VPN:-

-         It is called virtual private network.

-         It provides establishment of secure private network between 2 end points.

In MPLS network basically L2VPN & L3VPN services are used as per routing exchange information between CE & PE routers.

L2VPN:

1.     There is no routing interaction occurs between CE & PE routers.

2.     Epipe , VPWS, VPLS is examples of L2VPN service.

Scenario-: company “Purl pay” headquarter at New York location and their multiple branches at Chicago, New Jersey and Houston locations then company wants point-to-point connections between HQ and all sub-branches then VPLS service is used.
 
& in other case if company wants to communicate only between New York HQ to New Jersey branch office : EPIPE , VPWS, F PIPE , A PIPE type point-to-point service can be configured depending on technology used.
       Why ?? How it configured ??
 
Let’s discussed..


n  VPLS service configuration is always used in point-to-multipoint connectivity. It’s one type of Hub-spoke technology.

n  In our scenario, New York is HQ and Chicago, New jersey and Houston locations are sub branch locations .

n  Spoke-sdp is used to connect multiple branch locations connectivity with HQ location.




                    Figure - 1: VPLS service Architecture 


in other case, service requirement is point-to-point so, Epipe service can be configured. (Technology: Ethernet)

Apipe  (Technology: ATM)

Fpipe  (Technology: Frame relay) 

 



                 Figure - 2 : EPipe service Architecture 




                          

Basic command line to check VPLS service:

1.     Show service service id..

2.     Show service service-using

3.     Show service fdb detail


Note : Need to check spoke-sdp status if it is up or down. If spoke-sdp is down need to check end to end LSP and Path status.

1.     If all associated path (Primary and all secondary path status maximum up to total 8 no. of paths without SRLG) is down traffic should be running on hop-less if it is available.

2.     fdb (forwarding database) status is used to check layer 2 reachability is there or not. But only in VPLS Services we can check ARP status in FDB table. On contrary, if service is Epipe there is no mac table entry is there.

This is main difference between Epipe and VPLS service.

3.     RSVP is used for traffic engineering purpose.


 

                    Figure - 3 : BGP route-table  

Internet reachability is possible only through BGP protocol. In BGP table, only routes which is most specific best routes entry is reflected via  >* .

RD and RT is main 2 component for route exchange.

RD : Route distinguisher : It should be unique value.

RT : Route Target:  How to exchange routes between 2 VRFs.

& it is generally defined by As no . : nn .


















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