Connecting an existing LAN to a WAN

Hi All,

I'm currently implementing an MPLS network into an area of a company but want to use their existing LAN in the company, the MPLS fibre line will terminate at the server room,

my question how i do map out what the LAN design is going to be ? do i still need to set up a LAN from the new WAN and connect it to the existing company LAN or do i just connect the company LAN directly to the new MPLS WAN

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Bryant SchaperCommented:
Not sure I am completely understanding, but yes you still have a LAN.  Typically you have the local switches hitting either your own router or one from the carrier and they will distribute your site IP scheme via BGP.  Or other site will have a router as well, and their side will also distribute it's IP scheme.
Yemi7Author Commented:
Hi Bryan,

can you explain a little bit more how the BGP works ,

Bryant SchaperCommented:
BGP is a routing protocol that used to distribute routes to other routers in the same AS.  Similar to eigrp if you know that one.  In a nutshell your router or the cpe from the carrier will advertise that your local lan, call it, is located at that router.  Other routers will learn this from an association created on both devices.  They exchange a routing table to know to topo of the network.

It may happen seemlessly for you, carrier might just ask what the local ip address scheme is at the site.  Assuming that site A and site B are not on the same ip scheme for example, you will not have problems.

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