In most routers or switches that support MPLS, if transit label and uhp LSP label need to have a different label range? when protocol(LDP or BGP) assign labels, I know that VPN label and LSP tunnel label have different range, but I'm not very clear if transit label and termination LSP label have different label range?
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An MPLS label is a 20-bit field, so the range is 0 to 1048575. There is no set definition for values for a specific purpose, so every manufacturer does it differently. Cisco, among others, allows you to modify the label ranges to suit your needs.
Ron Trunk
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