ZyXEL Communications VMG1312-B Series, Руководство пользователя

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Chapter 10 Quality of Service (QoS)
VMG1312-B Series User’s Guide
178
10.6.1 Add/Edit a QoS Policer
Click Add n e w Police r in t he Police r Se t u p screen or t he Edit icon next t o a policer t o show t he
follow ing screen.
Figure 70 Policer Set up: Add/ Edit
The following t able describes t he labels in t his screen.
Table 47 Policer Set up: Add/ Edit
LABEL DESCRIPTION
Act ive Select t he check box t o act ivat e t his policer.
Nam e Ent er t he descr ipt ive nam e of t his policer.
Met er Type This show s t he t raffic m et er ing algor it hm used in t his policer.
The Sim ple Tok e n Bu ck e t algorit hm uses t okens in a bucket t o cont rol w hen t raffic can be
t ransm it t ed. Each t oken represent s one byt e. The algorit hm allow s burst s of up t o b byt es
which is also t he bucket size.
The Sin gle Ra t e Thr e e Color M a r k e r ( srTCM) is based on t he t oken bucket filt er and
ident ifies packet s by com paring t hem t o t he Com m it t ed I nform at ion Rat e ( CI R) , t he
Com m it t ed Bur st Size ( CBS) and t he Excess Bur st Size ( EBS) .
The Tw o Ra t e Th r e e Color M a r k e r ( t rTCM) is based on t he t oken bucket filt er and
ident ifies packet s by com par ing t hem t o t he Com m it t ed I nfor m at ion Rat e ( CI R) and t he
Peak I nform at ion Rat e ( PI R) .
Com m it t ed
Rat e Specify t he com m it t ed rat e. When t he incom ing t raffic rat e of t he m em ber QoS classes is
less t han t he com m it t ed rat e, t he device applies t he conform ing act ion t o t he t raffic.
Com m it t ed
Bur st Size Specify t he com m it t ed bur st size for packet burst s. This m ust be equal t o or less t han t he
peak bur st size ( t w o rat e t hree color ) or excess bur st size ( single rat e t hr ee color ) if it is also
configured.
This is t he m axim um size of t he ( first ) t oken bucket in a t raffic m et er ing algor it hm .
Conform ing
Act ion Specify w hat t he Device does for packet s w it hin t he com m it t ed rat e and burst size ( green-
m arked packet s) .
• Pa ss: Send t he packet s wit hout m odificat ion.
• D SCP M a r k : Change t he DSCP m ark value of t he packet s. Ent er t he DSCP m ark value t o
use.
Non-
Conform ing
Act ion Specify what t he Device does for packet s t hat exceed t he excess burst size or peak rat e and
burst size ( red- m arked packet s) .
• D r op: Discar d t he packet s.
• D SCP M a r k : Change t he DSCP m ark value of t he packet s. Ent er t he DSCP m ark value t o
use. The packet s m ay be dropped if t here is congest ion on t he net w or k.