Figure 21-30 Ubr Connection, Upc Overview - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

Cisco bpx-bxm-155-8dx: user guide
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Traffic Policing Examples

Figure 21-30 UBR Connection, UPC Overview

UBR Traffic
Cells
per
sec.
TAT
CLP(0+1) cells to Leaky Bkt 1
5
CLP=1
Time
interval
variations
CDVT(0+1)
Leaky Bkt 1
Note: The notation 0, 1, and 0+1 refers
Cisco BPX 8600 Series Installation and Configuration
21-56
Verify
Multiple PVCs
VPIs,
VCIs
CPE
PCR
SCR=0 when CLP=Yes (UBR.2)
Time
Clumping
(Cells arriving early, i.e, at a
higher than contracted rate)
TAT
TAT
TAT
4
3
2
CLP=0
CLP=1
CLP=0
5
CLP=1
4
CLP=0
CLP(0) cells
+
compliant with
Leaky Bkt 1,
applied to
Leaky Bkt 2
PCR(0+1)
Leaky Bkt 1
discards
if depth >
CDVT(0+1)
to the types of cell being specified:
cells with CLP set to 0, CLP set to
1, or both types of cells, repectively.
For example, CLP(0), CLP(1), and
CLP(0+1)
To UPC for each
individual PVC
Policing
Cells arriving late
(at a less than
contracted
TAT
TAT
TAT
1
CLP=0
3
CLP(1) cells compliant with Leaky Bkt 1, admit to network
CLP=1
2
1
CLP=0
CLP=0
BT + CDVT
Leaky Bkt 2
SCR=0
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Chapter 21
Configuring ATM Connections
For UBR connections, the first bucket
polices PCR compliance within the
CDVT(0+1) limits. The second bucket,
used when CLP is set to Yes, tags all
CLP(0) cells.
cell rate)
TAT
4
2
CLP=0
CLP=0
Admit to network
+
For CLP = No, (i.e., UBR.1),
Leaky Bkt 2 sees no traffic.
For CLP = Yes, (i.e., UBR.2), CLP(0)
cells that were compliant with Leaky Bkt 1
are sent to Leaky Bkt 2. Since SCR = 0
for Leaky Bkt 2, the bucket is essentially
always full, and all cells are therefore
tagged with CLP being set to 1. This
allows the network to recognize these
UBR cells as lower priority and
available for discard in the event of
network congestion.
1
CLP=0

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