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d. Create service using the defined tag action.
Creating Data Services (on page 183)
Creating IP Video Services (on page 196)
Note: The upstream traffic on a service VLAN must have the same priority value as is
set for the downstream traffic.
ï‚Ÿ Traffic coming from the network going downstream to Ethernet Trunk and Edge
ports can use class map, class rules, and policy maps to match the ingress Layer-3 value
of incoming frames and assign a corresponding P-bit (priority) value.
Some service providers' networks include core routers or aggregation switches that are
not setup to use P-bits for traffic management downstream. Instead DSCP is used for
this purpose. In these cases all traffic received by the access node has a P-Bit value of 0,
and the access node needs to set the P-bit at the network interface, or traffic internal to
the access node will be discarded at random (service unaware).
See Creating a Policy Map for L3 Priority Mapping (on page 102).
DSCP traffic classes
The DSCP traffic classes are described in RFC 2474, RFC 2597, RFC 3246, the P-Bit
construct in IEEE 802.1p. The table below shows the mapping between Traffic Classes and
P-bits:
IP DSCP
Where x is 1,2,3,4 (higher is better), and y is 1, 2, 3 (lower is better)
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