07-06-2004 07:59 AM
Hello,
Please pardon my entry-level knowledge of how these things work...
I am the customer. A basic representation of the network is:
CEa-----PE-----PE-----CEc
|
|
|
CEb-----PE-----PE-----CEd
All CE locations are my sites. CEa and CEb are part of the same OSPF area 0 as they are directly connected by a leased line.
The provider tells me that all the configuration I need to make this work is the following:
On each CE router, configure the frame circuit with provided IP / dlci, then
router bgp 1
neighbor x.x.x.x remote-as 65000
no auto-summary
So my CE routers do not know of any mpls or vrf, they are simply running ospf internally and peering with bgp 65000 (the provider). From what I understand, this is called PE-based or Peer-VPN.
Prior to the implementation, which is scheduled in 2 weeks, all locations are connected by frame-relay and all are in the same ospf area 0.
************************
Again, pardoning my ignorance, but that can't be all there is to it. I know I will need redistribution between bgp and ospf, but are there other questions I need to ask of the provider?
Thank you,
Jim
07-06-2004 09:47 AM
The redistribution as you mentioned is the only thing missing in this picture. In most cases CE configuration are pretty straitghtforward.
Hope this helps,
07-06-2004 11:15 AM
Something to keep your eye on:
If you plan on using the same BGP AS for all of your sites (pretty common), make sure your MPLS VPN provider configures "as-path override" on the PE's ! If they don't, your sites will not see eachother's prefixes. Or worse, they will prefer your non-MPLS VPN links over the provider's MPLS backbone if you are also advertising these routes via OSPF. Good luck !
07-06-2004 01:05 PM
I'd like to think that the SP is able to handle that part. Otherwise, you're in for a bigger surprise ;o)
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