Quality of Service Guide QoS and QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 55
Table 5 describes the access, network, and hybrid port scheduling behavior after
upgrading to 7705 SAR Release 7.0.R6 (or later) for Gen-3 hardware, and compares
it with the scheduling behavior of Gen-2 and Gen-1 hardware.
In summary, with Release 7.0.R6 and later, the following updates to Gen-3
scheduling are implemented:
• enabled CIR-based shaping for:
− per-SAP aggregate ingress and egress shapers
− per-customer aggregate ingress and egress shapers
− per-VLAN shaper at network egress when port is in hybrid mode
− access and network aggregate shapers for hybrid ports
• disabled backpressure to the FC queues dependent on the relative priority
among all VLAN-bound IP Interfaces at:
− access ingress and access egress when port is in access mode
− access ingress and access egress when port is in hybrid mode
− network ingress
− network egress when port is in hybrid mode
Table 5 Scheduling Behavior After Upgrade to 7705 SAR Release 7.0.R6 (or Later)
Port Type Gen-3 Hardware with
4-Priority Mode
Gen-1 or Gen-2
Hardware with 4-Priority
Mode
Gen-1 Hardware with
Profiled Mode
Access Within a SAP EXP over BE EXP over BE N/A
Default configuration Simple round-robin (RR)
scheduling among SAPs
EXP (across all queues,
no SAP boundaries) over
BE
N/A
H-QoS and MSS
aggregate shapers
RR among aggregates
based on PIR and CIR
(SAP at tier 2, MSS at tier 3)
N/A N/A
Network Default configuration
(8 queues per port)
EXP over BE EXP over BE Conforming over
non-conforming traffic
in RR among queues
Per-VLAN shaper EXP over BE RR among VLAN shapers
based on PIR and CIR
RR among VLAN
shapers based on PIR
and CIR
Hybrid Default configuration
(8 queues per port)
EXP over BE EXP (across all SAPs and
network queues) over BE
N/A
Per-VLAN shaper RR among VLAN shapers
based on PIR and CIR
RR among VLAN shapers
based on PIR and CIR
N/A
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