Figure 21-28 Vbr.1 Connection, Policing = 1, With Buckets 1 And 2 Compliant - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

Chapter 21 Configuring ATM Connections

Figure 21-28 VBR.1 Connection, Policing = 1, with Buckets 1 and 2 Compliant

Connection setup
and compliance status:
VBR.1
Policing = 1
Bkt 1 depth < CDVT(0+1)
Bkt 2 depth < BT + CDVT
5
CLP=1
Time
interval
variations
CDVT(0+1)
Leaky Bkt 1
PCR(0+1)
Leaky Bkt 1
discards if depth
> CDVT(0+1)
Figure 21-29 shows a VBR.3 connection policing example, with policing set to 3, and Leaky bucket 2
shown as 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.
For the policing = 3 selection, CLP tagging is enabled, so the cells that have exceeded the BT +
CDVT(0+1) limit are tagged as CLP=1 cells and admitted to the network.
In this example, either the sustained cell rate could have been exceeded for an excessive interval, or a
data burst could have exceeded the maximum burst size allowed.
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
4 3 2
CLP=0 CLP=1 CLP=0 CLP=0
5 4
CLP=1 CLP=0
+
+
BT + CDVT
Leaky Bkt 2
SCR
For policing = 1,
CLP(0+1) cells are
discarded if Bkt 2
depth > BT + CDVT
1
3 2 1
CLP(0+1) cells compliant with
CLP=1 CLP=0 CLP=0
Leaky Bkt 1, applied to Leaky Bkt 2
5 4 3
CLP=1 CLP=0 CLP=1
CLP(0+1) cells compliant with
Leaky Bkt 2, admit to network
Cisco BPX 8600 Series Installation and Configuration
Traffic Policing Examples
2 1 To network
CLP=0 CLP=0
21-53