Brocade FastIron Ethernet Switch Platform and Layer 2 Swit Manual de usuario descargar pdf (Pagina 45)

Default queue depth limits for FastIron X Series devices

The following table defines the default maximum queue depth values per port, per traffic class. The

Brocade device drops the packets that cause the port to exceed these limits.

NOTE

The SX-FI48GPP Interface module supports 48 tri-speed (10/100/1000) ports. When the ports are

configured at lower speeds, for example, 100 Mbps or 10 Mbps, the maximum queue depth is less than

256 when egress congestion occurs at the front-end Network Processor (NP) of the SX-FI48GPP

module. If egress congestion occurs at the back-end NP of the SX-FI48GPP module, the maximum

queue depth is 4095. The limit for buffer sharing is 4088.

Default maximum queue depthTABLE 7

Port type Maximum queue depth per

port, per priority 0 - 6

Maximum queue depth

per port, per priority 7

Total maximum queue

depth

1 Gbps port 96 224 896

10 Gbps port without jumbo

enabled

400 704 3504

10 Gbps port with jumbo

enabled

352 640 3104

Configuring the total transmit queue depth limit for FastIron X Series

devices

NOTE

To configure the total transmit queue depth limit on a third-generation module, refer to Buffer profile

configuration on page 47.

To set the total transmit queue depth limit on a port, enter a command such as the following.

device(config)#qd 2 2049

This command sets the queue depth limit on port 2 to 2049. Packets are added to the port's outbound

queue as long as the packets do not cause the port to exceed 2048 buffers. If the port reaches its

queue depth limit of 2049, any new packets attempting to enter the port transmit queue will be dropped

until at least one buffer is freed.

Syntax: qd port limit

The limit variable can be a value from 0 through 4095. Table 7 on page 45 lists the default values.

Default queue depth limits for FastIron X Series devices

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Brocade FastIron Ethernet Switch Platform and Layer 2 Swit Manual de usuario Pagina 45