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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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The Use of MPLS QoS for Ethernet over MPLS

So far in this chapter, the packet for which the QoS was set was an IP packet or a labeled packet. However, in the case of Ethernet over MPLS (EoMPLS), the forwarded packet is actually an Ethernet frame. If the frame is a non-VLAN Ethernet frame, it does not have QoS information embedded. If the frame is an 802.1Q frame, though, the Priority bits (P bits) in the 802.1Q header designate a QoS value. If a service provider carries the 802.1Q Ethernet frames over an MPLS network as in the case of point-to-point EoMPLS or VPLS, it would be nice if he could police the traffic and recolor it, if needed. You can do this in Cisco IOS. You can match the 802.1Q Priority bits in MQC by matching cos values in the ...

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