Quality of Service Guide QoS and QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 111
3.5.3.4 Network Ingress 16-Priority Scheduling
The cards and ports that support 16-priority scheduling for network ingress traffic are
listed in Table 12.
For a detailed description of how 16-priority scheduling functions, refer to Network
Egress 16-Priority Scheduling.
The 7705 SAR-8 and 7705 SAR-18 adapter cards, and the 7705 SAR-M,
7705 SAR-H, 7705 SAR-Hc, 7705 SAR-A, 7705 SAR-Ax, 7705 SAR-W, and
7705 SAR-Wx ports provide sets of 8 queues for incoming traffic: 7 sets of queues
for the 7705 SAR-8, 17 sets of queues for the 7705 SAR-18, and 4 sets of queues
for the 7705 SAR-M, 7705 SAR-H, 7705 SAR-Hc, 7705 SAR-A, 7705 SAR-Ax,
7705 SAR-W, and 7705 SAR-Wx.
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 the 7705 SAR-M,
7705 SAR-H, 7705 SAR-Hc, 7705 SAR-A, 7705 SAR-Ax, 7705 SAR-W, and
7705 SAR-Wx, 3 sets of queues are automatically created, plus 1 set of queues for
multicast traffic. For all these platforms, 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 an adapter card on a 7705 SAR-8 or 7705 SAR-18
share the same sets of queues, which are created automatically. All of the network
ingress ports across the entire 7705 SAR-M, 7705 SAR-H, 7705 SAR-Hc,
7705 SAR-A, 7705 SAR-Ax, 7705 SAR-W, or 7705 SAR-Wx also share the same
sets of queues, which are created automatically.
3.5.4 Network Ingress Shaping to Fabric
After the traffic is scheduled, it must be sent to the fabric interface. In order to avoid
congestion in the fabric and ease the effects of possible bursts, a shaper is
implemented on each adapter card.
Network ingress shaping to the fabric operates in a similar fashion to access ingress
shaping to the fabric. See Ingress Shaping to Fabric (Access and Network) for
details.
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