Network Router User Manual

Chapter 21: QoS Configuration Guide
304 SmartSwitch Router User Reference Manual
To enable aggregate rate limiting mode on the SSR, enter the following command in
Configure mode:
To change the rate limiting mode on the SSR back to per-flow mode, negate the above
command.
Per-Flow Rate Limiting
Use a per-flow rate limiting policy if an individual traffic flow needs to be limited to a
particular rate. A single per-flow rate limiting policy 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.
Note:
Per-flow rate limiting is enabled on the SSR by default. If you enable aggregate
rate limiting on the SSR, you cannot configure per-flow rate limiting policies.
To define a per-flow rate limit policy and apply the policy to an interface, enter the
following commands in Configure mode:
Note:
You cannot use non-IP ACLs for per-flow rate limit policies.
Port Rate Limiting
Use a port rate limiting policy if incoming or outgoing traffic on a particular port needs to
be rate limited. Unlike other types of rate limiting policies, you do not specify an ACL
when defining this type of policy. Port rate limiting policies do not need to be applied to
an interface and take effect when they are created.
To configure port rate limiting policies for input ports, you must first enable aggregate
rate limiting mode on the SSR (see “Rate Limiting Modes” on page 303). You do not need
to enable aggregate rate limiting mode to configure a policy to limit outgoing traffic on a
port. You can configure port-level rate limiting policies on output ports in either per-flow
or aggregate rate limiting mode.
Enable aggregate rate limiting
mode on the SSR.
system enable aggregate-rate-limiting
Define a per-flow rate limit
policy.
rate-limit <name> input acl <acl list> rate
<rate-limit> exceed-action drop-packets|set-
priority-low|set-priority-medium|set-
priority-high [sequence
<number>]
Apply a per-flow rate limit
profile to an interface.
rate-limit <name> apply interface
<interface>|all