QoS and QoS Policies
110
Quality of Service Guide
3HE 11014 AAAC TQZZA Edition: 01
3.5.3.2 Network Ingress 4-Priority (Gen-3) Scheduling
The adapter cards and ports that support 4-priority (Gen-3) scheduling for network
ingress traffic are listed in Table 12. See QoS for Gen-3 Adapter Cards and
Platforms for details.
3.5.3.3 Network Ingress Scheduling on 8-port Ethernet Adapter
Cards
Network ingress ports on the 8-port Ethernet Adapter card support profiled
scheduling (rate-based scheduling). This scheduling is done in the same manner as
for access ingress traffic described in Profiled (Rate-based) Scheduling.
The 8-port Ethernet Adapter card provides sets of eight queues for incoming traffic.
Each set of queues is specific to a destination adapter card. For the 7705 SAR-8, 6
sets of queues are automatically created for each access egress adapter card, plus
1 set of queues for multicast traffic. For the 7705 SAR-18, 16 sets of queues are
automatically created, plus 1 set of queues for multicast traffic. For both the
7705 SAR-8 and the 7705 SAR-18, there is 1 additional set of queues for slow-path
(control) traffic that is destined for the CSMs.
Each queue within each set provides buffer space for traffic isolation based on the
classification carried out on EXP bits of the MPLS packet header (that is, the CoS
setting).
All of the network ingress ports on the 8-port Ethernet Adapter card share the same
sets of queues, which are created automatically.
Once the packets received from the network are mapped to queues, two profiled
(rate-based) schedulers per destination card service the queues in strict priority. The
following profiled schedulers service the queues in the order shown.
• in-profile scheduler
• out-of-profile scheduler
To complete the operation, user-configurable shapers send the traffic into the fabric.
See Configurable Ingress Shaping to Fabric (Access and Network) for details.
Throughout this operation, each packet retains its individual CoS value.
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