Configuration Guide User guide

FastIron Configuration Guide 1955
53-1002494-02
Chapter
50
Rate Limiting on FastIron WS Series Switches
Table 323 lists the individual Brocade FastIron switches and the rate limiting features they support.
These features are supported in the Layer 2, base Layer 3, edge Layer 3, and full Layer 3 software
images, except where explicitly noted.
This chapter describes how to configure fixed rate limiting on inbound and outbound ports on FWS
devices using the CLI.
Rate limiting overview
Fixed rate limiting allows you to specify the maximum number of bytes a given port can send or
receive. The port drops bytes that exceed the limit you specify. You can configure a Fixed rate
limiting policy on a port inbound or outbound direction. Fixed rate limiting applies to all traffic on
the rate limited port.
When you specify the maximum number of bytes, you specify it in kilobits per second (Kbps). The
Fixed rate limiting policy applies to one-second intervals and allows the port to send or receive the
number of bytes you specify in the policy, but drops additional bytes. Unused bandwidth is not
carried over from one interval to the next.
NOTE
Brocade recommends that you do not use Fixed rate limiting on ports that send or 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 323Supported rate limiting features
Feature FESX
FSX 800
FSX 1600
FWS FCX FCX ICX 6610 ICX 6430
ICX 6450
Inbound rate limiting
(Port-based rate limiting
on inbound ports)
Yes
For details,
see Chapter
49 on page
1947.
Yes Yes
For details,
see Chapter
49 on page
1947.
Yes
For details,
see Chapter
49 on page
1947.
Yes For
details, see
Chapter 49
on page
1947
Yes
For details,
see
Chapter 49
on page
1947
Outbound rate limiting
(Port-based and port- and
priority-based rate limiting
on outbound ports)
No Yes No No No No
ACL-based rate limiting Yes Yes Yes Yes No No
For details about ACL-based rate limiting, see Chapter 42, “Traffic Policies”.