Dell Brocade DCX, Configuration Manual

Page: 571 / 1436

BigIron RX Series Configuration Guide 499
53-1001810-01
Configuring rate limiting policies
19
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 469.
For information on the other parameters, refer to “Configuring a port-based rate limiting policy” on
page 498.
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.
BigIron RX(config)# interface ethernet 1/3
BigIron RX(config-if-e1000-1/3)# rate-limit in vlan 10 500000000 750000000
Average rate is adjusted to 499321856 bits per second
BigIron RX(config-if-e1000-1/3)# rate-limit in vlan 20 100000000 600000000
Average rate is adjusted to 97523712 bits per second
The commands configure two rate limiting policies that limit the requested rate of inbound traffic
on port 1/3. The first policy request to limit packets with VLAN tag 10 to an rate of 500 Mbps with a
maximum burst size of 750 Mbits on the port. The second policy requests to limit packets with
VLAN tag 20 to an rate of 100 Mbps with a maximum burst size of 600 Mbits on the port. Tagged
packets belonging to VLANs other than 10 and 20 and untagged packets are not subject to rate
limiting on port 1/3.
Syntax: [no] rate-limit input vlan <vlan-number> <requested-rate> <maximum-burst>
The vlan <vlan-number> parameter species the VLAN ID to which the policy applies. Refer to
“Configuration considerations” on page 497 to determine the number of rate limiting policies that
can be configured on a device.
For information on the other parameters, refer to “Configuring a port-based rate limiting policy” on
page 498.