Ruckus Wireless Ruckus ICX 7150 Series, Руководство по настройке

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Packet buffer management
The following table lists the packet memory bandwidth and the total packet memory on ICX devices.
TABLE 13 Packet memory on ICX devices
ICX device Total bandwidth Total packet memory
Ruckus ICX 7150 126 Gbps 2 MB
Ruckus ICX 7250 200 Gbps 4 MB
Ruckus ICX 7450 200 Gbps 4 MB
Ruckus ICX 7650 480 Gbps
564 Gbps (IO 48ZP/48ZF)
328 Gbps (IO 48P)
8 MB
Ruckus ICX 7750 960 Gbps (48C/F)
1280 Gbps (32Q) 12 MB
These devices run in cut-through mode, which means that cut-through eligible packets are not buffered. If a packet must be buffered, it is
buffered after Layer 2 and Layer 3 lookup. The packet priority is classified before buffering.
NOTE
The ICX 7650 device does not run in cut-through mode.
There are two independent packet admission mechanisms: ingress buffer management and egress buffer management.
Ingress buffer management
On the Ruckus ICX 7150, ingress buffer management tracks buffer utilization on a per-ingress-port basis.
• Loss-less behavior through symmetric flow control is supported.
• Buffers are reserved for high-priority traffic.
As these accounting structures reach their limit, incoming packets to the ingress port are dropped.
On the Ruckus ICX 7250, ICX 7450, and ICX 7750 devices, ingress buffer management determines whether a packet should be admitted
into memory based on the state of available memory and the amount of buffer resources in use by the ingress PG. The aim of the
mechanism is to support fair access to buffering resources while also enabling loss-less operation across a network. The memory is
logically divided into three sections:
• Guaranteed
• Shared
• Headroom for flow control in on-the-fly packets
Ingress buffer limits are automatically configured based on your configuration to support either loss-less or tail-drop operation. You can
configure the
qos ingress-buffer-profile command to configure a share level, which determines the maximum number of buffers a PG can
use as a fraction of the total sharing pool. For example, if PG 0 is at level 4, it can use up to 1/9 of the total sharing buffers in the sharing
pool. The actual number of buffers a PG can use depends on the number currently available in the system.
On the Ruckus ICX 7650, there is a default profile for ingress buffer management, but it is not configurable because PFC is not supported.
Quality of Service
Packet buffer management
Ruckus FastIron QoS and Traffic Management Configuration Guide, 08.0.70
Part Number: 53-1005294-01 27