Cisco Systems 8600 Series manual VBR.1

Traffic Policing Examples

Figure 7-19shows a VBR.1 connection policing example, with policing set to 1, and both buckets compliant. Leaky bucket 1 is policing the CLP (0+1) cell stream for conformance with the PCR limit. Leaky bucket 2 is policing the CLP (0+1) cell stream for conformance CDVT plus maximum burst size MBS (as specified by BT), and for compliance with SCR sustained cell rate.

Figure 7-19 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

4

3

2

1

CLP=1

CLP=0

CLP=1

CLP=0

CLP=0

5

4

3

2

1

CLP(0+1) cells compliant with

CLP=1

CLP=0

CLP=1

CLP=0

CLP=0

Time

Leaky Bkt 1, applied to Leaky Bkt 2

interval

variations

+

5

4

3

2

1

To network

CDVT(0+1)

CLP=1

CLP=0

CLP=1

CLP=0

CLP=0

Leaky Bkt 1

CLP(0+1) cells compliant with

PCR(0+1)

Leaky Bkt 2, admit to network

BT+ CDVT

+

Leaky Bkt 1

Leaky Bkt 2

discards if depth

> CDVT(0+1)

SCR

For policing = 1,

CLP(0+1) cells are

S6349

discarded if Bkt 2

depth > BT + CDVT

ATM Connections 7-33