Cisco WS-C6506 Software Manual page 1417

Chapter 55 Configuring a VoIP Network
Trusted Boundary Configuration Guidelines
This section describes the guidelines for configuring the trusted boundary:
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Common Open Policy Service (COPS) considerations
COPS directly affects how the QoS parameters are applied. A port may have either a local policy or
a COPS policy. This setting specifies whether the port should get its QoS configuration information
from the local configuration or through a COPS server. If COPS is enabled on a port and is also
globally enabled, the policy that is specified by the COPS server applies. If COPS is disabled and/or
the run-time policy is local, the local configuration QoS policy applies. The extended trust boundary
feature overrides the "local" policy on a port.
QoS configuration support
All the QoS port trust configuration settings are supported (trust-cos, trust-ipprec, trust-dscp), but
you should use trust-cos for the Cisco IP Phone networks.
System log messaging
New QoS syslogs were added for the trusted boundary to notify you of the changes to a port's trust state
and to warn of improper configuration. To see these syslogs, set the QoS logging level to 5 (set logging
level qos 5). The default is 3. Refer to the Catalyst 6500 Series System Message Guide for the
descriptions of the syslogs.
Final run-time port trust value
The final run-time port trust on any port is dependent on the following:
Trusted boundary configuration
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Phone's presence on the port
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QoS configuration
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COPS configuration
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To enable the trusted boundary, you must enable QoS and you must enable CDP globally and on the
port, running in version 2 mode. You must set COPS to local policy (the COPS default) or to disabled
(the COPS default). When ciscoipphone is configured as the trust-device on the port, the feature is
enabled and detects the presence of a Cisco IP Phone and sets the trust values.
See Figure 55-6 to determine the final trust value on a port.
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Configuring VoIP on a Switch
55-35