Cisco BPX 8600 Series, Руководство по установке и настройке

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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 21-26 VBR.2 Connection, Policing = 2, with Buckets 1 and 2 Compliant
Figure 21-27 shows a VBR.2 connection policing example, with policing set to 2, and leaky bucket 2
non-compliant. Leaky bucket 2 is shown policing the CLP(0) cell stream for conformance with
maximum burst size MBS (as specified by BT), and for compliance with SCR (sustained cell rate).
In this example (policing set to 2), CLP tagging is not enabled, so that the cells that have exceeded the
BT + CDVT limit are discarded. In the example, either the sustained cell rate could have been exceeded
for an excessive interval, or a data burst could have exceeded the maximum allowed burst size.
CLP(0) cells
compliant
with Leaky Bkt 2,
admit to network
+
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=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
Discard
non-compliant
CLP(0) cells