Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 62)

The ingress descriptors are total of 16K buffers. Each buffer is 512 bytes. The 16K buffers are divided
into 8 cores of 2K each.
The egress descriptors are divided into two pools. Pool 1 is shared by ports 1/1/9 to 1/1/56, and pool 2
is shared by the rest of ports. Each pool is 8K. Frames targetting ports that belongs to core 0-3 uses
descriptors from the first pool. Frames targetting ports that belong to 4-7 uses descriptors from the
second pool.
Buffer and descriptor maximum and default allocation values for ICX
6650
The maximum and default buffers and descriptor values of a port on ICX 6650
The table below lists the maximum and default buffers and descriptors values of a port and its queues
on Brocade ICX 6650. Values in the following tables are for software traffic classes (TCs) or QoS
priority (qosp) levels.
Port buffer and descriptors values TABLE 16
1 Gbps buffers and
descriptors 10 Gbps buffers and
descriptors 40 Gbps buffers and
descriptors
Port Limit 8096 8096 8096
TC0 128 160 256
TC1 32 48 64
TC2 32 48 64
TC3 32 48 64
TC4 32 48 64
TC5 64 96 144
TC6 64 96 144
TC7 64 96 144
ICX 6650 buffer sharing levels
This section details the buffer sharing levels for ICX 6650.
For ICX 6650, the buffer sharing level configures the shared buffers on the device. The shared buffers
are divided into pools. Each of the following pools defines the buffer allocation for a set of traffic class
(TC) queues
• Pool 0 contains TCs 0 and 1.
• Pool 1 contains TCs 2, 3, and 4.
• Pool 2 contains TCs 5 and 6.
• Pool 3 contains TC 7.
Buffer and descriptor maximum and default allocation values for ICX 6650
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