Cisco BPX 8600 Series, Руководство по установке и настройке

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21-52
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Chapter 21 Configuring ATM Connections
Traffic Policing Examples
Figure 21-27 VBR.2 Connection, Leaky Bucket 2 Discarding CLP (0) Cells
Figure 21-28 shows a VBR.1 connection policing example, with policing set to 1, and both buckets
compliant.
Leaky bucket 1 is policing the CLP (0+1) cell stream for conformance with the PCR limit.
Leaky bucket 2 is policing the CLP (0+1) cell stream for conformance with CDVT plus maximum burst
size MBS (as specified by BT), and for compliance with SCR sustained cell rate.
+
SCR
BT + CDVT
Leaky Bkt 2
CLP=1
5
CLP=0
4
CLP=1
3
CLP=0
2
CLP=0
1
+
PCR(0+1)
CDVT(0+1)
Time
interval
variations
Leaky Bkt 1
CLP=1
5
CLP=1
3
CLP=0
4
CLP=0
2
CLP=0
1
CLP(1) cells compliant with Leaky bkt 1, admit to network
CLP(0) cells
compliant with
Leaky Bkt 1,
applied to
Leaky Bkt 2
Connection setup
and compliance status:
VBR.2
Policing = 2
Bkt 1 depth < CDVT(0+1)
Bkt 2 depth > BT + CDVT
S6348
CLP=0
2
CLP=
0
1
To network
CLP=0
4
Two CLP(0) cells, 1 and 2, are shown as
non-compliant with the BT + CDVT limit
of Leaky Bkt 2 and are discarded in this
example where policing = 2. With
policing = 3, they would be tagged as
CLP=1 and admitted to the network.
Discard
Leaky Bkt 1
discards if depth
> CDVT(0+1)