Can MPLS live outside VPN?
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Posted by Michelot on June 6, 2008, 4:43 pm
Please log in for more thread options Do you think that MPLS can exist without VPN, or do you think that MPLS is always in relationship with VPN? Thanks, best regards, Michelot | |||||||||||||||||||
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Posted by Thrill5 on June 7, 2008, 12:50 am
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Posted by Stephen on June 7, 2008, 9:05 am
Please log in for more thread options On Fri, 6 Jun 2008 13:43:38 -0700 (PDT), Michelot
>Bonsoir,
> >Do you think that MPLS can exist without VPN, or do you think that >MPLS is always in relationship with VPN? VRF lite means that you can partition a box into 2 or more logical routers - and there is no linkage to using MPLS. lots of good reasons to do that, starting with security or management separation. >
--
>Thanks, >best regards, >Michelot Regards stephen_hope@xyzworld.com - replace xyz with ntl | |||||||||||||||||||
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Posted by Paul Matthews on June 7, 2008, 11:31 am
Please log in for more thread options Michelot wrote:
>Bonsoir,
> >Do you think that MPLS can exist without VPN, or do you think that >MPLS is always in relationship with VPN? MPLS s a technology that almost died. The initial point of MPLS or tag switching was to speed the packet forwarding process - use a label rather than looking deeper into the packet. That almost died when L3 switching came along and beat the performance benefit of MPLS, Then the use of MPLS to create VPNs took off and that's the main point now. -- Paul Matthews CCIE #4063 Please post questions to the NG, NOT by e-mail. | |||||||||||||||||||
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Posted by Michelot on June 7, 2008, 1:33 pm
Please log in for more thread options Bonsoir,
Thanks for your good ideas. I also made progress in this point and stuck all the pieces together! > [from Thrill5] Depends on your definition of VPN.
You're right, and I would prefer the definition of ITU-T (and not this of Wikipedia, the popular vision). In the VPN we have the client service (client level 1 to 3) and the transport of this service in the provider network (server level 1 to 3, often independant of the client level). > [from Stephen] VRF lite means that you can partition a box into 2 or more
logical
> routers - and there is no linkage to using MPLS.
I agree with you. For the server level of the client service we can have e.g. VLAN provider, IP provider, ATM provider, and even directly TDM, not only MPLS. The VPN intelligence is in the PE (provider edges) face to the CE (customer edges) and not in the P nodes, the nodes between the PE. These nodes can be LSR, IP router, ATM switch, ADM, OADM... > [from Paul Matthews]
> MPLS s a technology that almost died. The initial point of MPLS or tag > switching was to speed the packet forwarding process - use a label rather than > looking deeper into the packet. That almost died when L3 switching came along > and beat the performance benefit of MPLS, Then the use of MPLS to create VPNs > took off and that's the main point now. The server level of the VPN client service can be MPLS or other thing. Your comment is to know if the MPLS transport will go on or not. Today MPLS is changing with the ITU-T works, in T-MPLS, with OAM added. Anyway, the initial MPLS is generally used as a typical L2 switching by providers, just above the TDM connections. And the issue is to take e.g. the TDM alarms back up to the upper levels. Best regards, Michelot | |||||||||||||||||||
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>
> Do you think that MPLS can exist without VPN, or do you think that
> MPLS is always in relationship with VPN?
>
> Thanks,
> best regards,
> Michelot