Nokia 7705 - Page 101

Quality of Service Guide QoS and QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 101
As shown in Figure 21, traffic from the fabric flows to one or more VLANs, where it is
classified and mapped to up to eight different CoS queues on a per-VLAN basis. The
VLANs can be shaped or unshaped. Each shaped VLAN has its own set of CoS
queues. The aggregate of unshaped VLANs uses the same set of CoS queues (that
is, one set of queues for all unshaped VLANs).
For more information, see Per-VLAN Network Egress Shapers and Shaped and
Unshaped VLANs.
Figure 21 Network Egress Shaped and Unshaped VLAN Queuing and Scheduling
Note: Due to space limitations in Figure 21, the second-tier, per-VLAN aggregate shapers
are represented as a single loop containing the label “per VLAN”, even though they are
dual-rate shapers similar to the third-tier network aggregate shaper.
Buffer Mgmt
via WRED
or Tail Drop
Per VLAN
Aggregate Shaper
Port Shaper
Queue Layer
Scheduling
Classification
and Acc/NW Egr.
per FC queuing
24354
RR
Rate
Ethernet
port
NW
Aggregate Shaper
CoS-8
CoS-1
CoS-7
16-priority
Scheduled
Unshaped
VLANs
(aggregate for
unshaped
VLANs)
16-priority
Scheduled
Shaped or
Unshaped
VLANs
(per VLAN
aggregate
shaper)
16-priority
Scheduling
nc
VLAN
h1
be
CoS-8
CoS-1
CoS-7
nc
VLAN
h1
be
Strict
Priority
Dual Rate
Shaper
In-Prof
Out-Prof
Strict
Priority
per
VLAN
Hi_prio
per
VLAN
CIR
CIR,
PIR (see Note 1)
CIR,
PIR
Lo_prio
CoS-8
CoS-1
CoS-7
16-priority
Scheduling
nc
Unshaped
VLANs
h1
be
Strict
Priority
Hi_prio
Lo_prio
1st Tier 2nd Tier 3rd Tier
Fabric
Note 1: Each per-VLAN aggregate shaper
is a dual rate shaper similar to the
3rd tier dual rate shaper
Cos-8
In-Prof
Cos-1
In-Prof
Cos-8
Out-Prof
Cos-1
Out-Prof
Cos-8
In-Prof
Cos-1
In-Prof
Cos-8
Out-Prof
Cos-1
Out-Prof