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Chapter 52
Configuring QoS
Figure 52-5
No
1
Specified by
port keyword and dscp
2
From IP precedence-to-DSCP map
3
From CoS-to-DSCP map
4
F
rom DSCP markdown map
5
From DSCP-to-CoS map
OL-8978-04
PFC and PFC2 Classification, Marking, and Policing
From ingress
port or VLAN
L3 Switching Engine (PFC/PFC2) classification, marking, and policing
ACL(s)
IP
on ingress
Packet?
interface?
Yes
Yes
Match
ACE in ACL?
No
Use default
ingress ACL
ACE
keyword or by
ACE
keyword
1
Trust
Yes
Yes
received
DSCP?
No
No
1
Trust
Yes
received IP
precedence?
No
1
Trust
Yes
received or
port CoS?
No
1
Traffic is from
an untrusted
port
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Understanding How QoS Works
Policing
Use received
rule in
DSCP
ACE?
Yes
2
Set DSCP
Out of
from received
profile?
IP precedence
Yes
3
Set DSCP
from received
Markdown?
or port CoS
Yes
4
Set DSCP
Use DSCP
to marked
from ACE
down value
5
Derive CoS
from DSCP
To egress
interface
No
Drop
packet
52-7
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