Product guide

Quality of Service (QoS): Managing Bandwidth More Effectively
Preparation for Configuring QoS
then you should plan and configure your QoS resource usage first for that
switch. If insufficient resources remain for all of the ACL implementation you
want, try spreading this implementation across multiple switches.
QoS Resource Usage and Monitoring on
3400cl/6400cl Switches
QoS, ACLs, multicast protocols, and Rate-Limiting configurations on the
3400cl/6400cl switches use rule resources on a per-port basis. Per-Port rule
usage is reserved as shown below:
Table 8-9. Rule Maximums on the 3400cl/6400xl Switches
Feature Maximum Rules Available Per-Port
QoS and Rate-Limiting
1
120 maximum in any
ACLs and IGMP
2
feature combination
1
Configuring Rate-Limiting on a port uses one per-port rule on that port.
2
Configuring IGMP on any static VLAN uses one per-port ACL mask on all ports.
Table 8-10 describes rule resource use for each QoS classifier type.
Table 8-10. QoS Rule Resource Usage
QoS Classifier Port Application Rules Used
TCP and UDP All Ports in the Switch 2 per TCP or UDP Application
Device Priority “ “ “ “ “ 2 per IP Address
ToS IP-Precedence “ “ “ “ “ 8
ToS Diff-Services “ “ “ “ “ 1 per Codepoint
1
VLAN All Ports in the VLAN 1 per VLAN
Source Port Specified Port(s) 1 per Port
2
1
When the ToS Diff-Services mode is enabled, each codepoint (DSCP) policy configured in
the DSCP map and each (inbound) codepoint assigned to a DSCP policy use one rule per-
port. When this mode is disabled, all rules used by the ToS Diff-Services option, including
any DSCP policies configured in the DSCP map, become available for other uses.
2
Enabling source-port QoS and rate-limiting on the same port uses one rule.
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