WB 15.15

NOTE: Increasing the software rate limit increases CPU consumption and may

impact system performance.

If the software rate limit is specified beyond 1000 pps, the warning listed below

will be displayed:

Increasing the software rate limit would increase CPU

consumption and may impact the system performance.

Limiting the usage of hardware resources

Syntax

OpenFlow # limit policy-engine-usage | ip-ctrl-table-usage

| multiport-filter-usage max-percentage

policy-engine-usage

Maximum percentage of policy engine resources used by OpenFlow.

ip-ctrl-table-usage

Maximum percentage of IP control table resources used by OpenFlow.

multiport-filter-usage

Maximum percentage of the multiport-filter resources used by OpenFlow.

You can limit the OpenFlow usage of policy engine resources, ip control table and

multiport filters so that other functions that use the same resources are not impacted

severely.

The limit can only be set when OpenFlow is disabled globally.

Max-Percent

Specifying 0% allocates no resources for OpenFlow.

By default, the OpenFlow policy engine resource usage is set at 50% to avoid

oversubscribing resources and impacting performance. In addition to OpenFlow,

the policy engine resource can be used by Access Control Lists, Quality of

Service, Identity Driven Management, Virus Throttling, Mirroring, Policy Based

Routing, and other features.

NOTE: The maximum percentage is not a guaranteed percentage but a

maximum allowed limit.

Using the default 50% resource usage setting, the 8200zl and 5400zl switches

with v1 zl modules, and the 3500/3500yl, 6200yl, and 6600 switches can

support approximately 1000 OpenFlow rules in hardware while the 8200zl

and 5400zl switches with v2 zl modules and the 3800 switches can support

up to 2000 OpenFlow rules in hardware.

To increase the number of flows beyond the default 50% setting, use the above

OpenFlow limit policy-engine-usage command. If all policy engine resources

are in use, OpenFlow rules will no longer be added in hardware and the switch

will deny attempts to configure ACLs with the CLI. To determine resource usage

on your switch, see “Viewing OpenFlow resources” (page 40) and the appendix

titled “Monitoring Resources” in the latest Management and Configuration

Guide for your switch.

Default: 50%Range: 0 — 100%

NOTE: Resource usage can only be set when OpenFlow is disabled.

30 Configuring OpenFlow