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Monitoring QoS
The IA provides display of QoS statistics and configurations contained in the IA.
To display QoS information, enter the following commands in Enable mode:
Show all IP QoS flows.
Show all Layer-2 QoS flows.
Limiting Traffic Rate
Traffic rate limiting provides the ability to control the usage of a fundamental network
resource, bandwidth. It allows you to limit the rate of traffic that flows through the
specified interfaces, thus reserving bandwidth for critical applications. Unlike traffic
prioritization, traffic rate limiting is a mechanism to control bandwidth usage of incoming
traffic on a per flow basis.
A traffic profile is used to define the traffic characteristics before an upper limit is assigned.
The traffic profile is created using one or more ACLs which can utilize any combination of
the parameters supported in the IP ACL. A rate limiting profile can then be defined by
using the ACL and traffic rate limitations. A single rate limiting profile can have multiple
ACLs to define different traffic profiles and traffic rate limitations. When there are
multiple traffic profiles, a sequence number is used to identify the order in which the
profiles are applied. You can define the action taken on the traffic that exceeds the upper
limit: either drop the packets or reset the priority of the traffic. The rate limiting profile is
then applied to a logical IP interface.
To define a rate limit profile and apply the profile to an interface, enter the following
commands in Configure mode:
Define a rate limit profile.
Apply a rate limit profile to an
interface.
Note:
You cannot use non-IP ACLs for rate limit profiles.
Internet Appliance User Reference Manual
Chapter 15: QoS Configuration Guide
qos show ip
qos show l2 all-destination all-flow
<port-list>
ports
<MACaddr>
dest-mac
<name>
rate-limit
input acl
<rate-limit>
exceed-action drop-packets|set-
priority-low|set-priority-medium|set-
priority-high [sequence
<name>
rate-limit
apply interface
<interface>
|all
<vlanID>
vlan
source-mac
<MACaddr>
<acl list>
rate
<number>
]
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