Specifications

122 ExtremeWare XOS 11.0 Concepts Guide
Quality of Service
Using bi-directional rate shaping, excess traffic is discarded at the I/O module and does not traverse to
the backplane. You view statistics on the discarded traffic using the
show ports qosmonitor or show
ports information
command.
The 802.1p value is mapped to the ingress queue. For untagged ports, use port- or VLAN-based QoS to
map traffic to the ingress queue.
Bandwidth Settings
You apply ingress QoS profile (IQP or rate shaping) values as either a percentage of bandwidth or as an
absolute value in Kbps or Mbps. IQP bandwidth settings are in turn applied to queues on physical
ports. The impact of the bandwidth setting is determined by the port speed (1 or 10 Gbps).
NOTE
You may see slightly different bandwidths because the switch supports granularity down to 62.5 Kbps.
Maximum Bandwidth Settings
The maximum bandwidth settings determine the port bandwidth available to each of the ingress port
queues.
Minimum Bandwidth Settings
The minimum bandwidth settings, or maximum committed rate settings, determine the port bandwidth
reserved for each of the ingress port queues.
Table 24 displays the maximum committed rates available for each port on each I/O module.
10 Gbps module IQP1 1
IQP2 2
IQP3 3
IQP4 4
IQP5 5
IQP6 6
IQP7 7
IQP8 8
Table 24: Maximum committed rates per port for I/O module
I/O module MSM configuration Maximum committed rate
1 Gbps module Single MSM 200 Mbps
Dual MSM 400 Mbps
10 Gbps module Single MSM 2 Gbps
Dual MSM 4 Gbps
Table 23: Ingress queue mapping for I/O modules (continued)
I/O module Ingress queues Priority value