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Technical Description
User/cust
domain
User/customer
Priority
Figure 6
User/Customer and Network Domains
User/Customer Priority
The priority setting used in the user/customer domain and set by the
user/customer. The user/customer priority information can be retrieved in one
of five different ways from the user domain frames:
1. From the C-VLAN tag PCP bits in Ethernet header
2. From the S-VLAN tag PCP bits in Ethernet header
3. From the IPv4 DSCP bits in IP header
4. From the IPv6 DSCP bits in IP header
5. From the MPLS EXP bits IP header
Network Priority
The network priority is the Ethernet frame's priority setting used in the
operator/network domain. The different network priority values are defined
by the operator.
An Ethernet frame's network priority is typically a representation of the traffic
type and the application generating the Ethernet flow (for example, voice call).
The traffic types and associated priority values are standardized in IEEE802.1Q
2005 and IEEE802.1D 2004. Each traffic type is associated with a priority
value to indicate the relative importance of that traffic type. Highest number
equals highest priority.
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Network domain
Network
Priority
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User/cust
domain
User/customer
Priority
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