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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274 Chapter 8: QoS Support on the Catalyst 6500
only be modified on Gigabit Ethernet and fabric-enabled 10/100 ports when running Cisco
IOS. The same situation applies to ports configured for VLAN-based QoS.
trust-ipprec and trust-dscp instruct the switch to analyze the ToS field in the IP header of
arriving packets. When configured, the IP precedence option accepts the three least signif-
icant bits in the precedence field within the ToS byte, whereas the DSCP option utilizes the
6 bits reserved for the codepoint value within the ToS byte. Configuring a port to trust the
IP precedence or DSCP is accomplished as follows:
(Hybrid)
set port qos {
mod/port ...
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