Chapter 55 Configuring a VoIP Network

Configuring VoIP on a Switch

Trusted Boundary Configuration Guidelines

This section describes the guidelines for configuring the trusted boundary:

•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-cosfor 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

–Phone’s presence on the port

–QoS configuration

–COPS configuration

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 55-6to determine the final trust value on a port.

 

 

Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7

 

 

 

 

 

 

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Cisco Systems OL-8978-02 manual Trusted Boundary Configuration Guidelines, 55-35
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OL-8978-02 specifications

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