June 2003
Intermediate to advanced
432 pages
15h 56m
English
book
Cisco Catalyst QoS: Quality of Service in Campus Networks
by Mike Flannagan - CCIE® No. 7651, Richard Froom - CCIE No. 5102, Kevin Turek - CCIE No. 7284
Content preview from Cisco Catalyst QoS: Quality of Service in Campus Networks
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210 Chapter 7: QoS Features Available on the Catalyst 4000 IOS Family of Switches and the Catalyst
Untrusted Interfaces
The term untrusted port refers to an interface that does not utilize the DSCP or CoS value of an
ingress frame for determining the internal DSCP value. Unlike the default behavior of the
Catalyst 4000 CatOS switches where all ports are trusted, the default behavior for all interfaces
of a Catalyst 4000 IOS switch is to not trust DSCP or CoS (that is, untrusted). As a result, the
switch classifies the frame with an internal DSCP value of zero by default. The terms port DSCP
configuration and port CoS configuration identify untrusted ...
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