Brocade Communications Systems Brocade ICX 6650 6650 - Manual (Page 293)

Brocade ICX 6650 Security Configuration Guide 273
53-1002601-01
Chapter
11
Rate Limiting and Rate Shaping
Table 65 lists the rate limiting and rate shaping features supported on Brocade ICX 6650. These
features are supported in the Layer 2, edge Layer 3, and full Layer 3 software images, except where
explicitly noted.
This chapter describes how to implement and configure port-based rate limiting and rate shaping
on Brocade ICX 6650.
Port-based rate limiting
Rate limiting applies to inbound ports and rate shaping applies to outbound ports. Port-based fixed
rate limiting is supported on inbound ports. This feature allows you to specify the maximum
number of packets a given port can receive. The port drops packets that exceed the limit you
specify. You can configure a Fixed rate limiting policy on a port inbound direction only. Fixed rate
limiting applies to all traffic on the rate limited port.
Fixed rate limiting is at line rate and occurs in hardware. Refer to “Rate limiting in hardware” on
page 274.
The Fixed rate limiting policy applies to one-second intervals and allows the port to receive the
number of packets you specify in the policy, but drops additional packets. Unused bandwidth is not
carried over from one interval to the next.
NOTE
Port based Rate Limiting affects only known-unicast traffic. Broadcast, Multicast and
Unknown-unicast (BUM) is not affected by this rate. To rate limit the BUM traffic, use BUM rate
limiting as described in chapter BUM Rate Limiting.
NOTE
Brocade recommends that you do not use Fixed rate limiting on ports that receive route control
traffic or Spanning Tree Protocol (STP) control traffic. If the port drops control packets due to the
Fixed rate limiting policy, routing or STP can be disrupted.
TABLE 65 Supported rate limiting and rate shaping features
Feature Brocade ICX 6650
Inbound rate limiting (Port-based rate
limiting on inbound ports) Yes
Outbound rate shaping Yes