Nokia 7705 - Page 59

Quality of Service Guide QoS and QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 59
Figure 10 shows 4-priority scheduling for access egress on Gen-3 hardware. QoS
behavior for access egress is similar to QoS behavior for access ingress.
The 4-priority schedulers on the Gen-1/Gen-2 and Gen-3 hardware are very similar,
except that 4-priority scheduling on Gen-3 hardware is done on a per-SAP basis.
Figure 10 4-Priority Scheduling at Access Egress (Gen-3 Hardware)
CoS-8
CoS-1
CoS-7
Hi_prio
Lo_prio
4-priority
Scheduling
Exp
In-Prof
BE
In-Prof
Exp
Out-Prof
BE
Out-Prof
Strict
Priority
per
SAP
CIR,
PIR
SAP
CIR, PIR
Per-Cust (MSS)
Shaper Group
CIR, PIR
Per-Cust (MSS)
Shaper Group
CIR, PIR
Per-Cust (MSS)
Shaper Group
CIR, PIR
Per-Cust (MSS)
Shaper Group
Access
Egress
Port
Shaper
RR
Rate
Ethernet
port
CoS-8
CoS-1
CoS-7
Hi_prio
Lo_prio
4-priority
Scheduling
Exp
In-Prof
BE
In-Prof
Exp
Out-Prof
BE
Out-Prof
Strict
Priority
per
SAP
CIR,
PIR
SAP
CoS-8
CoS-1
CoS-7
Hi_prio
Lo_prio
4-priority
Scheduling
Exp
In-Prof
BE
In-Prof
Exp
Out-Prof
BE
Out-Prof
Strict
Priority
per
SAP
CIR,
PIR
SAP
nc
h1
be
nc
h1
be
nc
h1
be
Buffer Mgmt
via WRED
or Tail Drop
Per SAP,
Per FC
Queuing
4-Priority
Schedulers
(Per SAP)
Per SAP
Aggregate
Shapers
Per Customer
(MSS) Dual Rate
Aggregate
Shaper Groups
Fabric
Shaper
Classification
25888
Tier 1 Tier 2
Tier 3
Fabric