Figure 27: Egress Policer Threshold Determination And Output Behavior - Alcatel-Lucent 7950 Quality Of Service Manual

Access Egress
Discard-Unfair and
Discard-All
Thresholds Based
on Child Priority
'profile in'?
IP-Profile = In
L2-Profile = Hard-In
PIR Threshold = High
CIR Threshold = 2x
CIR Rate = 0?
CIR Threshold = 0
Egress Queue
(Discarded)
Profile-out-
preserve
Y
Ingress in-
Dot1P = 'Out'
DE = '1'
(when enabled)
Tail Drop = 'Low'
Egress Queue

Figure 27: Egress Policer Threshold Determination and Output Behavior

7950 XRS Quality of Service Guide
Policing
Parent
Egress Egress
N
'profile out'?
Y Y
IP-Profile = Out
L2-Profile = Hard-Out
PIR Threshold = Low
CIR Threshold = 0
Do not change
N
CIR Threshold
Y
Discard:
Handoff to
appropriate queue
group queue or
local queue for
accounting
L2-Profile =
N
Hard-In?
N
Y
profile?
Dot1P = 'In'
DE = '0'
(when enabled)
Tail Drop = 'High'
Egress Queue
Egress Policer CIR Packet Handling with Profile
Ingress
'soft-in-profile' Ingress
N N
and Profile 'soft-in-profile'?
Capped?
Y Y
IP-Profile = In IP-Profile = In
L2-Profile = Soft-In L2-Profile = Soft-In
PIR Threshold = High PIR Threshold = High
CIR Threshold = 2x CIR Threshold = 1x
FIR Threshold =
FIR Rate = 0? N
PIR Threshold
Y
FIR Threshold = 0
Y
E
R
L Profile
E HPol
L Capped?
D
O
W
GREEN N
L2-Profile =
N CIR = 0?
Hard-Out?
Y
Hard-In or
Soft-In?
Y
Not Possible with
CIR Threshold = 0
Ingress
N
'soft-out-of-profile'
IP-Profile = Out
L2-Profile = Soft-Out
PIR Threshold = Low
CIR Threshold = 1x
IP headers Marked
according to
IP-Profile
Dot1P = 'Out'
DE = '1'
Y
(when enabled)
Tail Drop = 'Low'
Dot1P = 'Out'
DE = '1'
N
(when enabled)
Tail Drop = 'Low'
Dot1P = 'Out'
DE = '1'
N
(when enabled)
Tail Drop = 'Low'
Dot1P = 'In'
DE = '0'
Y
(when enabled)
Tail Drop = 'High'
Egress Queue
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