Ruckus Wireless Ruckus ICX 7150 Series, Руководство по настройке

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Egress buffer management
This mechanism tracks buffer utilization on a per-egress port and priority basis. As these accounting structures reach the limit, packets that
are destined to the congested egress port-priority are tail-dropped. The aim of the mechanism is to support fair access to the buffering
resources among congested egress ports. Any incoming packet is counted only once per egress port regardless of whether it is unicast or
multicast. Memory is logically divided into two sections:
• Guaranteed is on a per-port-priority basis.
• Shared is on a per-port basis for the Ruckus ICX 7150 device. It is on a per-port-priority basis for the Ruckus ICX 7250, ICX 7450,
and ICX 7750 devices.
On the Ruckus ICX 7250, ICX 7450, ICX 7650, and ICX 7750 devices, sharing is a ratio of the remaining buffers. You can configure the
share level to determine the maximum number of buffers that an egress queue can use as a fraction of the total sharing pool. For example,
if queue 4 is at level 4, it can use up to 1/9 of the total sharing buffers in the sharing pool. You can configure eight levels of sharing. The
actual number of buffers that a queue can use depends on the number currently available in the system.
On the Ruckus ICX 7150, buffer sharing is on a per port basis instead of a per queue basis. Also, the buffer sharing level is calculated with a
fraction of the total number of buffers. For example, level7-1/2 allows 1/2 of the total buffers as sharing buffers, which is 1 MB.
Configuring QoS
The configuration of QoS includes the following:
• Port priority
• Static MAC entries to priority queues
• QoS marking
• DSCP to internal forwarding priority mappings
• VLAN priority 802.1p to hardware forwarding queue mappings
• Queuing method
• QoS queue naming and percentage of a port outbound bandwidth guaranteed to the queues
• Minimum bandwidth of WRR queues
• Bandwidth allocation for hybrid WRR and SP queues
• Priority flow control
• Ingress and egress buffer profile
Quality of Service
Configuring QoS
Ruckus FastIron QoS and Traffic Management Configuration Guide, 08.0.70
28 Part Number: 53-1005294-01