User guide

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Release Notes for Cisco IOS Release 12.4T
OL-8012-09 Rev. B0
Platform-Specific Information
behaviors are xxx000, with the values of xxx ranging from 1 to 7 and the code points called Class Selector
Code Points (cs1-cs7 in the command shown above). The default value is 000000 for media and
signaling.
Two other RFCs have also defined PHBs. RFC 2597 defines the Assured Forwarding PHB Group. With
Assured Forwarding (af11-af43), bits 0 to 2 represent the class of traffic stream, and bits 3 to 5 represent
the drop priority of a traffic stream. RFC 2598 defines the Expedited Forwarding PHB Group and is
intended to be used with media streams. Because it is possible that more PHB groups will be defined or
that end users will want to experiment with a DSCP of their own, you may configure a DSCP with a value
of 0 to 63 (rather than being limited to only the currently defined PHBs).
The recommended values are ip qos dscp ef media and ip qos dscp af31 signaling.