Brocade BigIron RX Series Configuration Guide - Manual (Page 593)

BigIron RX Series Configuration Guide 515
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Configuring rate limiting policies
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Syntax: [no] rate-limit input | output <requested-rate> <maximum-burst>
Input applies rate limiting to inbound traffic on the port. Input can be abbreviated as in.
Output applies rate limiting to outbound traffic on the port. Output can be abbreviated as out.
Notes:
• For outbound ports with slow speed links (for example, GbE), the rate supported is in
0.65Mbps increments, starting with 0.65 Mbps. That is, supported rates are 0.65 Mbps,
1.3 Mbps, 1.95 Mbps, etc.
• For 10GbE ports, the rate supported is in 10.375 Mbps increments, starting with
10.375Mbps. That is, supported rates are 10.375 Mbps, 20.75 Mbps, 31.125 Mbps, etc.
The <requested-rate> parameter specifies the maximum rate allowed on a port during a
one-second interval. The minimum configurable requested rate is 3000 bps. The maximum
configurable rate limiting rate is near line-rate.
Refer to “Requested rate” on page 512 for more details.
The <maximum-burst> parameter specifies the extra bits above the requested rate that traffic can
have. Refer to
“Maximum burst” on page 512 for more details.
Configuring a port-and-priority-based rate limiting policy
802.1p packet priority is used by default. The priority number specifies the IEEE 802.1 equivalent
to one of the four Brocade QoS queues. You can configure port-and-priority-based rate limiting for
each of the priority numbers 1 - 7 on a port.
To configure a port-and-priority-based rate limiting policy, enter commands such as the following at
the interface level.
BigIron RX(config)# interface ethernet 1/2
BigIron RX(config-if-e1000-1/2)# rate-limit in priority 0 500000000 750000000
Average rate is adjusted to 499639656 bits per second
BigIron RX(config-if-e1000-1/2)# rate-limit in priority 1 priority 2 priority 3
650000000 650000000
The commands configure port-and-priority-based rate limiting policies on inbound port 1/2. The
policies requests a rate limit of 500 Mbps on hardware forwarding queues 0 and 1 on the port, with
a maximum burst size of 750 Mbits. The device adjusts the requested rate to 499639656 bits per
second.
Syntax: [no] rate-limit input priority <num> <requested-rate> <maximum-burst>
The priority <num> parameter specifies the 802.1p priority levels 0 – 7, equivalent to one of the
four QoS queues. For information on the priority level and the corresponding queue, refer to
“Assigning QoS priorities to traffic” on page 484.
For information on the other parameters, refer to “Configuring a port-based rate limiting policy” on
page 514.
Configuring a port-and-VLAN-based rate limiting policy
To configure a port-and-VLAN-based rate limiting policy, enter commands such as the following.