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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Mapping 295
Figure 8-7 When to Change the Default Map Settings
Because the sources for the internal DSCP values have been determined, the discussion can
now turn to how the internal DSCP values are mapped back into a frame upon egress.
Catalyst 6500 trusts inbound IP
precedence and CoS on appropriate
ports. Inbound values are subsequently
mapped to an internal DSCP value.
IP Precedence and CoS 3 mapped to DSCP 26
IP Precedence and CoS 5 mapped to DSCP 46
DSCP
Router
Trust CoS
802.1q
Trunk
Catalyst
6500
Layer 2
Switch
Switch does not
set Layer 3 Prec/
DSCP values.
•• Voice control traffic
marked with CoS 3
Voice Bearer Frames
from IP phones marked
with CoS 5
Trust IP ...
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