But honestly now, how many enterprises really need their frame-relay circuits configured for full-mesh? Almost none.
And in particular, if you really want to talk about offering FR circuits over MPLS, why mess around with RFC2547 (L3VPN's)? You talk about looking at and routing customer's layer-3 traffic, so that necessarily involves L3VPN's. But wouldn't the idea of offering FR circuits be better served by a L2VPN? Granted, you still have the N-squared scaling problem if you want full-mesh, but like I said, how many enterprises really need full mesh? This is where I think the hype has outstripped reality. Yes, MPLS VPN has its uses. But I don't think it deserves the hype it's getting - it's not the greatest thing since sliced bread. And in particular, I don't understand the huge push for L3VPN's when it seems like L2VPN's are significantly more palatable, at least for the foreseeable future. After all, right now looks like the biggest uses of MPLS VPN's are to replace ATM and FR links, but wouldn't the best way to do so be to perfectly emulate ATM/FR using a L2VPN? Customers get investment-protection by continuing to use their existing ATM/FR gear and expertise, they can still run any L3 protocol just like before, and (probably most important of all) providers don't have to risk scalability problems in dealing with customers' route tables. ""Warner Dan"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > John, > > What kind of circuits do you have today. The cool thing about MPLS is that > lets say your have a lot of Frame-Relay circuits. As a service provider, I > could take those FR circuits in and give you a full-mesh. How, by using > MPLS VPNs. So what I do now is pay attention to your ip routing, because I > can see your layer 3 traffic and route it appropriatly. Today most FR > providers use service internetworking. I take your FR connection and > convert it into ATM. MPLS take a label and maps it to the VPI/VCI in the > ATM header. > > Cell mode MPLS uses downstream on Demand to do label assignment, kind of > like doing SVCs. So it is rather easy to build a full mesh! > > And I have seen a few SPs selling a lot cheaper than an all FR network. > > AT&T has something called IPFR, check it out. > > Other types of links, let me know! > > Hope this helps! > > Regards, > > Dan Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=39124&t=36670 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
