Brocade Communications Systems 6650 manual Rate shaping, Configuration notes for rate shaping

Outbound rate shapers can be configured only on physical ports, not on virtual or loopback ports.

Rate shaping

Rate shaping

Outbound Rate Shaping is a port-level feature for shaping the rate and controlling the bandwidth of outbound traffic on a port. This feature smooths out excess and bursty traffic to the configured maximum limit before it is sent out on a port. Packets are stored in available buffers and then forwarded at a rate no greater than the configured limit. This process provides for better control over the inbound traffic of neighboring devices.

The device has one global rate shaper for a port and one rate shaper for each port priority queue. Rate shaping is done on a single-token basis, where each token is defined to be 1 packet.

Configuration notes for rate shaping

The following rules apply when configuring outbound rate shapers:

•

•For trunk ports, config-trunk-indtrunk.

the rate shaper must be configured on individual ports of a trunk using the command (trunk configuration level); you cannot configure a rate shaper for a

•When outbound rate shaping is enabled on a port on an IPv4 device, the port QoS queuing method (qos mechanism) will be strict mode. This applies to IPv4 devices only. On IPv6 devices, the QoS mechanism is whatever method is configured on the port, even when outbound rate shaping is enabled.

•You can configure a rate shaper for a port and for the individual priority queues of that port. However, if a port rate shaper is configured, that value overrides the rate shaper value of a priority queue if the priority queue rate shaper is greater than the rate shaper for the port.

The configured rate shaper values are rounded up to the nearest multiples of minimum values supported on the platform. Table 67 shows the minimum and the maximum values for output rate shaping on Brocade ICX 6650.

TABLE 67	Output rate shaping on Brocade ICX 6650 devices
Device		Module	Minimum	Maximum
Brocade ICX 6650		40 Gbps ports	20 pkts/sec	80000000 pkts/sec
Brocade ICX 6650		10 Gbps ports	20 pkts/sec	20000000 pkts/sec

Configuring outbound rate shaping for a port

To configure the maximum rate at which outbound traffic is sent out on a port, enter the following commands.

Brocade(config)#interface ethernet 1/1/2 Brocade(config-if-e10000-1/1/2)#rate-limit output shaping 1300

Syntax: [no] rate-limit output shaping value

276	Brocade ICX 6650 Security Configuration Guide
	53-1002601-01