Cisco Systems OL-16066-01 appendix Ubr+, Vbr-Nrt, Vbr-Rt

Appendix K Router Platform User Interface Reference

PVC Policy Page

Table K-27	PVC Dialog Box—QoS Tab (Continued)
UBR		The following field is displayed when UBR is selected as the Bit Rate:
		• PCR—The peak cell rate for output in kilobits per second (kbps). Cells
		in excess of the PCR may be discarded.
UBR+		The following fields are displayed when UBR+ is selected as the Bit Rate:
		• PCR—The peak cell rate for output in kilobits per second (kbps). Cells
		in excess of the PCR may be discarded.
		• MCR—The minimum guaranteed cell rate for output in kilobits per
		second (kbps). Traffic is always allowed to be sent at this rate.
		Note UBR+ requires Cisco IOS Software Release 12.4(2)XA or later, or
		version 12.4(6)T or later.
VBR-NRT		The following fields are displayed when VBR-NRT is selected as the Bit
		Rate:
		• PCR—The peak cell rate for output in kilobits per second (kbps). Cells
		in excess of the PCR may be discarded.
		• SCR—The sustained cell rate for output in kilobits per second (kbps).
		This value, which must be lower than or equal to the PCR, represents the
		maximum rate at which cells can be transmitted without incurring data
		loss.
		• MBS—The maximum burst cell size for output. This value represents
		the number of cells that can be transmitted above the SCR but below the
		PCR without penalty.
VBR-RT		The following fields are displayed when VBR-RT is selected as the Bit Rate:
		• Peak Rate—The peak information rate for realtime traffic in kilobits per
		second (kbps).
		• Average Rate—The average information rate for realtime traffic in
		kilobits per second (kbps). This value must be lower than or equal to the
		peak rate.
		• Burst—The burst size for realtime traffic, in number of cells. Configure
		this value if the PVC carries bursty traffic.
		These values configure traffic shaping between realtime traffic (such as
		voice and video) and data traffic to ensure that the carrier does not discard
		realtime traffic, for example, voice calls.
	User Guide for Cisco Security Manager 3.2
K-66		OL-16066-01