Quality of Service (QoS): Managing Bandwidth More Effectively
Preparation for Configuring QoS
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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