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Table 10: Class Group Scheduling Properties and Membership
Class Group Scheduling Properties
(Weight) Forwarding Classes (Default
Mapping)
Fabric fc-sets Class Group
Traffic in the strict-high priority class
group is served first. This class group
receives all of the bandwidth it needs to
empty its queues and therefore can
starve other types of traffic during
periods of high-volume strict-high
priority traffic. Plan carefully and use
caution when determining how much
traffic to configure as strict-high priority
traffic.
•
All strict-high priority
forwarding classes
•
network-control
fabric_fcset_strict_high Strict-high priority
Traffic in the unicast class group receives
an 80% weight in the WRR calculations.
After the strict-high priority class group
has been served, the unicast class group
receives 80% of the remaining fabric
bandwidth. (If more bandwidth is
available, the unicast class group can
use more bandwidth.) • best-effort
•
fcoe
•
no-loss
NOTE: No forwarding classes
are mapped to the hidden
lossless fabric_fcsets by
default.
• fabric_fcset_be
•
fabric_fcset_noloss1
•
fabric_fcset_noloss2
Includes the hidden
lossless fabric fc-sets if
used:
•
fabric_fcset_noloss3
•
fabric_fcset_noloss4
•
fabric_fcset_noloss5
•
fabric_fcset_noloss6
Unicast
Traffic in the multidestination class
group receives a 20% weight in the WRR
calculations. After the strict-high priority
class group has been served, the
multidestination class group receives
20% of the remaining fabric bandwidth.
(If more bandwidth is available, the
multidestination class group can use
more bandwidth.) •
mcast
NOTE: No forwarding classes
are mapped to the hidden
multidestination fabric_fcsets
by default.
fabric_fcset_multicast1
Includes the hidden
multidestination fabric
fc-sets if used:
•
fabric_fcset_multicast2
•
fabric_fcset_multicast3
• fabric_fcset_multicast4
Multidestination
The fabric fc-sets within each class group are weighted equally and receive bandwidth
using round-robin scheduling. For example:
• If the unicast class group has three member fabric fc-sets,
fabric_fcset_be
,
fabric_fcset_noloss1
, and
fabric_fcset_noloss2
, then each of the three fabric fc-sets
receives one-third of the bandwidth available to the unicast class group.
• If the multidestination class group has one member fc-set, fabric_fcset_multicast1 ,
then that fc-set receives all of the bandwidth available to the multidestination class
group.
•
If the multidestination class group has two member fc-sets,
fabric_fcset_multicast1
and
fabric_fcset_multicast2
, then each of the two fabric fc-sets receives one-half of
the bandwidth available to the multidestination class group.
Copyright © 2015, Juniper Networks, Inc. 70
QFX3000-G QFabric System Deployment Guide