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MPLS QoS Tunneling Model

MPLS DiffServ aggregate packet classification is conveyed E-LSP vs. L-LSP

l  E-LSP means: EXP-Inferred-PSC LSP

Packet Class and dro precedence inferred from EXP (3-bit) field, so E-LSP can carry multiple classes (max eigth cos 3-bits). Cisco use E-LSP for frame-mode MPLS.

Local packet marking use QoS-group and discard class

Recommend qos-group used for class, and discard class used for drop precedence.

l  L-LSP means Label-Only-Inferred-PSC* LSP

Packet class inferred from label, drop precedence inferred from EXP or ATM CLP, can be used for frame-mode MPLS or Cell-mode MPLS, but not support yet in cisco.

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