7-24 Cisco BPX 8600 Series Reference
Traffic Policing Examples
Figure 7-11 CBR Connection, UPC Overview
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.
CBR Traffic
CPE
Multiple PVCs
To UPC for each
individual PVC
Time
Cells
per
sec.
PCR
Clumping
(Cells arriving early, i.e, at a
higher than contracted rate)
Cells arriving late
(at a less than
contracted
cell rate)
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).
S6341
TAT TAT TAT TAT TAT TAT TAT TAT
Verify
VPIs,
VCIs
(TAT=Theoretical Arrival Time for cells per traffic contract)
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.
Policing
Policing: 4 = PCR Policing only
5 = off
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
Admit to network
CLP=1
5
CLP=0
4
CLP=1
3
CLP=0
2
CLP=0
1
Example: Policing = 4
