Figure 21-20 Cbr Connection, Upc Overview - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

Chapter 21 Configuring ATM Connections

Figure 21-20 CBR Connection, UPC Overview

CBR Traffic
CPE
Cells
per
sec.
Policing: 4 = PCR Policing only
Example: Policing = 4
5
CLP=1
Figure 21-21 shows a CBR.1 connection policing example, with policing set to 4, where the CDVT
depth of the single leaky bucket is not exceeded, and all cells, CLP(0) and CLP(1) are admitted to the
network.
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Verify
Multiple PVCs
VPIs,
VCIs
PCR
Time
5 = off
TAT
(TAT=Theoretical Arrival Time for cells per traffic contract)
4 3 2
CLP=0 CLP=1 CLP=0 CLP=0
Time interval variations
CDVT(0+1)
Leaky Bkt 1
PCR(0+1)
To UPC for each
individual PVC
Policing
(Cells arriving early, i.e, at a
higher than contracted rate)
TAT TAT TAT
5 4
1
CLP=1 CLP=0
+
Discards incoming CLP(0+1) cells if Bkt
1 depth > CDVT(0+1). Does not tag cells.
If Bkt 1 depth < CDVT(0+1), passes CLP=0
and CLP=1 cells on to network.
Note: The notation 0, 1, and 0+1 refers 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).
Cisco BPX 8600 Series Installation and Configuration
Traffic Policing Examples
For CBR connections, Leaky Bkt 1
ensures that the combined CLP=0
and CLP=1 cell traffic stays in PCR
compliance within the CDVT limits.
Leaky Bkt 1 admits compliant CLP
cells to the network, and discards
non-compliant CLP cells.
Clumping
TAT TAT TAT
3 2 1 Admit to network
CLP=1 CLP=0 CLP=0
Cells arriving late
(at a less than
contracted
cell rate)
TAT
21-45