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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Per-Hop Behaviors 53
Figure 2-3 illustrates the ToS byte with IP precedence and the redefined ToS byte with
DiffServ:
Figure 2-3 ToS Byte: With IP Precedence and Differentiated Services
Per-Hop Behaviors
With the introduction of the DSCP markings, there were significantly more possible
markings for packets (0–63 are the possible markings for packets). Because there were so
many more possible markings, the IETF decided to standardize what some of the
codepoints meant. In part, this is to provide backward compatibility to IP precedence and,
in part, this is to facilitate certain types of behaviors that were seen as fundamental to the
DiffServ architecture. ...
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