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For example, if company X uses ATT as the provider for MPLS, then who owns these edge routers ?
If you rent an MPLS line/link, the routers belong to your provider. Most often, you get an Ethernet port as handover.
if MPLS traffic goes over the internet then ...
MPLS traffic is only forwarded within a private or ISP network. There's no way to run it ...
4
Traffic between two switch ports doesn't even exit the other switch ports, so it won't even arrive at the router.
If there is nothing else going on (no DNS lookups, for example) then there will be nothing but traffic across the switch. You can assign long leases for infrequent DHCP traffic to the router; or indefinite leases for once-per-boot. DHCP, ...
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Something has to set the DSCP values. In a traditional network, that comes from either the end user / application, or intervening network hardware. Unless you have significant control of the device/application -- eg. VoIP phone -- the former can be a very dangerous road. The later is a very complicated, and tedious process. It is this area that machine ...
3
MPLS does not go into the "Internet" MPLS has several components, but it's mainly a switching mechanism used by the routers in the ISP networks. A router running MPLS switch the packet (the IP datagram) based on a label, instead of using the L3 address. This is supposed to be more efficient since the label is shorter and the FIB can be populated more ...
2
Your problem is that neither the DC_GE nor the BE router knows how to reach the other router. They both know how to reach the GE router because they are directly connected to it, and each knows about the directly connected networks.
A router will drop packets destined to a network for which a route does not exist in its routing table. Routers learn routes ...
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