Charles Wu wrote:
The above is the number one reason against using VLANs for layer 2
transport. A second important issue to consider is management. Every
device from end-to-end where you want to deliver layer 2 transport
requires configuration if you use VLANs.
It is worth noting that you lose the benefits of routing protocols when you
bridge your network
Both of the above issues are solved with MPLS. First, MPLS rides on top
of your layer 3 network giving you all the benefits of routing
protocols. Second, you only need to configure the edge device on either
side of a layer 2 virtual circuit. All the devices in-between
--including protection paths don't require additional configuration for
each virtual circuit.
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