Cisco Systems 8600 Series manual LP=0, 18 VBR.2 Connection, Leaky Bucket 2 Discarding CLP 0 Cells

Traffic Policing Examples

Figure 7-18shows a VBR.2 connection policing example, with policing set to 2, and leaky bucket 2 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). In this example (policing set to 2), CLP tagging is not enabled, so the cells that have exceeded the BT + CDVT limit are discarded. In the example, either the sustained cell rate could have been exceeded for an excessive interval, or a data burst could have exceeded the maximum allowed burst size.

Figure 7-18 VBR.2 Connection, Leaky Bucket 2 Discarding CLP (0) Cells

Connection setup

and compliance status:

VBR.2

Policing = 2

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 3 CLP(1) cells compliant with Leaky bkt 1, admit to network

CLP=1 CLP=1

Time	4		2	1
		CLP=0	CLP=0		CLP=0
interval
variations	CLP(0) cells
+
CDVT(0+1)	compliant with
				+
Leaky Bkt 1	Leaky Bkt 1,
	applied to		BT+ CDVT			2
						C
PCR(0+1)	Leaky Bkt 2		Leaky Bkt 2			LP=0
Leaky Bkt 1					SCR
discards if depth	Two CLP(0) cells, 1 and 2, are shown as
> CDVT(0+1)
		non-compliant with the BT + CDVT limit
		of Leaky Bkt 2 and are discarded in this
		example where policing = 2. With
		policing = 3, they would be tagged as
		CLP=1 and admitted to the network.

4 To network CLP=0

1 CLP=0

Discard

S6348

7-32Cisco BPX 8600 Series Reference