On 25/06/07, paul at clubi.ie <paul at clubi.ie> wrote:
> You're saying that building layers of networks through tunneling,
> with each layer running independent routing, is a good thing? There
Yes. The ability for me to run my own routing protocol and policy,
independent of my ISP, and using their backbone to connect my sites,
is a good thing.
> - desire to be able to route multiple IP address spaces, which comes
> about in large part because of the lack of public space
You're confusing MPLS with a specific application there of. And the
motivation behind VPNs is not as simple as the fact that some
organisations have overlapping address ranges.
> - hardware guys aversion to parsing IP (not fixed length, has options
> that might need to be parsed, no fixed-length network versus host
> identifiers to make hardware lookups cheaper to implement)
Most hardware routers can happily handle IP provided it sticks to a
standard header length. Most of the options aren't used, and packets
that do have them are punted to the CPU anyway.
> - The administrative overheads of IPv4
> (must configure public address per link for routing)
Most MPLS cores, IME, using public IP addressing on each link. So
this is hardly a fix.
> - lack of funky ways to route IP
> - this one isn't really valid, can be implemented for IP..
Huh? I'm not even sure what this means.
Thomas
--
Thomas Bridge
CCIE #14108
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