Product guide

Quality of Service (QoS): Managing Bandwidth More Effectively
QoS Operating Notes and Restrictions
VLAN should receive untagged traffic. For more on VLANs, refer to
chapter 2, “Static Virtual LANs (VLANs)”.
■ 3400cl and 6400cl Switches Only—SAP-Encapsulated Packet
Restriction: Except for source-port QoS and VLAN QoS, the 3400cl/
6400cl switches do not support QoS (or ACL) operation for SAP-
Encapsulated packets.
■ 3400cl/6400cl Switches Only—Packets with IP Option Fields in
the Header: UDP/TCP QoS is not supported for IP packets carrying
optional fields in their headers.
■ Maximum QoS Configuration Entries: The switches covered by this
guide accept the maximum outbound priority and/or DSCP policy config-
uration entries shown in table 8-16.
Table 8-16. Maximum QoS Entries.
Switch Software
Version
Maximum
QoS Entries
Notes for All Switch Models
Series 5300xl E.08.01 and
greater
250* • Each device (IP address) QoS
configuration uses two entries.
• Each TCP/UDP port QoS configuration
uses four entries.
• All other classifier configurations use one
entry each.
Series 3400cl
and
Series 6400cl
All 120*
*Configuring device (IP address) or TCP/UDP QoS entries reduces this maximum. See the
“Notes” column.
Attempting to exceed the above limits generates the following message
in the CLI:
Unable to add this QoS rule. Maximum number (entry-#)
already reached.
5300xl and 4200vl: Where a 5300xl switch is running a software release
earlier than E.08.01 and is configured with more than 250 QoS rules,
downloading software release E.08.01 (or greater) causes the switch to:
• Implement the first 250 QoS rules in its configuration, but ignore the
configured rules exceeding that limit.
• Generate these Event Log messages:
– Too many QoS configuration items - limit of 250
– Some QoS configuration items will not be active
8-74