what: mpls - multi-protocol label switching (frame tagging for the wan into the igp)
why: to provide path switching from the wan without the necessity of reading the ip packet every time
when: there is a need to preempt the routimg process with wire speed transfer
where: in ipv4/ipv6 networks
this is neanderthal at best... a beginning
network cisco ccna gns3 certification arteq
a network runs through it
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