Extreme Networks ExtremeWare XOS 11.3, Manual

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Quality of Service
ExtremeWare XOS 11.3 Concepts Guide
310
Bi-Directional Rate Shaping—BlackDiamond 10K
Switch Only
NOTE
If you are working with the BlackDiamond 8800 family of switches or the Summit X450 switch, refer to [ACL CHAP}
for information on metering the ingressing traffic.
With software version 11.0, you can configure and display bi-directional rate shaping parameters. on the
BlackDiamond 10K switch. Bi-directional rate shaping allows you to manage bandwidth on Layer 2 and
Layer 3 traffic flowing to each port on the switch and from there to the backplane. You can configure up
to 8 ingress queues, which send traffic to the backplane, per physical port on the I/O module. By
defining minimum and maximum bandwidth for each queue, you define committed and peak
information rates for each queue. You can define different priorities for each queue for each port. Rate
shaping on the ingress port allows the switch to enforce how much traffic from a particular port can
ingress to the system.
Bi-directional rate shaping on the BlackDiamond 10K switch controls the traffic from the ingress ports to
the backplane and provides guaranteed minimum rates. The number of queues from the ingress port to
the backplane differs between I/O modules. The 1 Gbps I/O module has 2 queues from the ingress port
to the backplane, and the 10 Gbps I/O module has 8 queues from the ingress port to the backplane.
You set minimum bandwidth, maximum bandwidth, and priority for each queue for each port. Use
prioritization when two or more hardware queues on the same physical port are contending for
transmission, only after their respective bandwidth management parameters have been satisfied. Once
the priorities are satisfied, the switch uses a round-robin system to empty the queues to the backplane.
Table 47 displays the mapping of the ingress queues and the priority value for each I/O module.
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.
Table 47: Ingress queue mapping for I/O modules on the BlackDiamond 10K switch
I/O module Ingress queues Priority value
1 Gbps module IQP1 1 to 4
IQP2 5 to 8
10 Gbps module IQP1 1
IQP2 2
IQP3 3
IQP4 4
IQP5 5
IQP61 6
IQP7 7
IQP8 8