Enterprise network environments, the ability to manage these sensitivities has become necessary. The
packet loss, delay, and delay variation requirements that VoIP, video, and mission-critical data
applications make of the network can be satisfied through the implementation of the QoS classification,
scheduling, provisioning, and management tools.
tools mark a packet or flow with a specific priority. This marking establishes a trust boundary that must
be enforced. Classification set this boundary by examining any of the following:
Switching [MPLS] experimental values)
Source/Destination IP address)
recommendations are to identify and mark (with DSCP values) traffic as close to the source of the traffic
as possible. The network edge where markings are accepted (or rejected) is referred to as the
"trust-boundary." If markings and trusts are set correctly, then intermediate hops do not have to perform
detailed traffic identification, but can administer QoS policies based on these previously set DSCP
markings. This approach simplifies policy administration and reduces CPU overhead.
phones or voice endpoints themselves.
Guide, Release 12.2.