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Configuring CoS for MPLS
When IP traffic
enters a label-switched path (LSP) tunnel, the ingress router marks
all packets with a class-of-service (CoS) value, which is used to
place the traffic into a transmission priority queue. On the router,
each interface has up to eight transmit queues. The CoS value is encoded
as part of the Multiprotocol Label Switching (MPLS) header and remains
in the packets until the MPLS header is removed when the packets exit
from the egress router. The routers within the LSP utilize the CoS
value set at the ingress router. The CoS value is encoded by means
of the CoS bits (also known as the EXP or experimental bits).
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