Chapter 39 Differentiated Services
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The DSCP value det er m ines t he PHB ( Per- Hop Behavior ) , t hat each packet get s as it is for war ded
acr oss t he DiffSer v net w or k. Based on t he m ar king r ule differ ent kinds of t raffic can be m ar ked for
differ ent pr iorit ies of for war ding. Resources can t hen be allocat ed accor ding t o t he DSCP values and
t he configur ed policies.
DiffServ Network Example
The following figur e depict s a DiffSer v net wor k consist ing of a group of dir ect ly connect ed DiffSer v-
com pliant net w or k devices. The boundar y node ( A in
) in a DiffSer v net wor k classifies
( m ar ks w it h a DSCP value) t he incom ing packet s int o differ ent t raffic flow s ( Pla t in u m , Gold,
Silve r, Br on z e ) based on t he configur ed m ark ing r ules. A net w or k adm inist rat or can t hen apply
various t raffic policies t o t he t raffic flows. An exam ple t raffic policy, is t o give higher dr op
pr ecedence t o one t raffic flow over ot her s. I n our exam ple, packet s in t he Br on z e t raffic flow ar e
m ore likely t o be dropped w hen congest ion occur s t han t he packet s in t he Pla t in u m t raffic flow as
t hey m ove acr oss t he DiffSer v net w or k.
Figure 231
DiffSer v Net w or k
39.2 Activating DiffServ
Act ivat e DiffSer v t o apply m ar king r ules or I EEE 802.1p pr iorit y m apping on t he Swit ch.
Click I P Applica t ion > D iff Se r v in t he navigat ion panel t o display t he scr een as show n.
G S B
P
S
B
B
G P P
S
P - Platinum
G - Gold
S - Silver
B - Bronze
G P P
S
A
