Quality of Service (QoS): Managing Bandwidth More Effectively
QoS Operating Notes and Restrictions
■ 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
400* • 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 Only: Where a 5300xl switch is running a software release earlier
than E.08.01 and is configured with more than 400 QoS rules, downloading
software release E.08.01 (or greater) causes the switch to:
• Implement the first 400 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 400
– Some QoS configuration items will not be active
■ 5300xl Switches Only—Non-Supported IP Packets: The DSCP policy
codepoint-remarking operation is not supported in any QoS classifier for
packets carrying IP options in the packet header.
8-71
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