Bandwidth Allocation To Pvcs - Cisco 10000 Series Configuration Manual

Chapter 5 Distributing Bandwidth Between Queues
Table 5-2
policer are configured on the interface.
Table 5-2 Committed Rate Data for Policing and Shaping
Action Frame Relay
Policing No bit or byte
stuffing
1
No 7E flags
No Frame Check
Sequence (FCS)
Shaping 4 bytes of Frame
Check Sequence
(FCS)
No bit or byte
stuffing
No 7E flags
1. The router does not account for flags or Frame Check Sequence (FCS) that the hardware adds or removes.
Table 5-3
Table 5-3
Media
Frame Relay
Ethernet
ATM variable bit rate (VBR)
ATM unspecified bit rate (UBR)
ATM constant bit rate (CBR)
1. For Frame Relay networks with link fragmentation and interleaving (LFI) enabled.

Bandwidth Allocation to PVCs

The router allocates bandwidth to variable bit rate (VBR), constant bit rate (CBR), and shaped (specifies
the peak cell rate) unspecified bit rate (UBR) PVCs before allocating bandwidth to unshaped UBR
PVCs. As a result, a diminished amount of bandwidth is available to allocate to unshaped UBR PVCs.
To override this behavior, create a hierarchical (nested) policy with the bandwidth specified and attach
the policy to the ATM port or physical interface.
OL-7433-09
describes the data included and excluded in the committed rate when a traffic shaper and
Ethernet
Generic Traffic Shaping No cell header
Class-Based Shaping
No AAL Common
No Inter-Frame Gap
Part Convergence
(IFG)
Sublayer (CPCS) pad
No Preamble
No ATM trailer
No Start of Frame
Delimiter (SFD)
No Frame Check
Sequence (FCS)
Generic Traffic Shaping ATM cell header
Class-Based Shaping
AAL Common Part
No Inter-Frame Gap
Convergence
(IFG)
Sublayer (CPCS) pad
No Preamble
ATM trailer
No Start of Frame
Delimiter (SFD)
Frame Check
Sequence (FCS)
describes what bandwidth is based on for each media type.
Basis for Bandwidth
ATM ADSL
Class-Based Shaping
No ATM cell
overhead
No AAL Common
Part Convergence
Sublayer (CPCS) pad
No ATM trailer
Class-Based Shaping
No ATM cell
overhead
No AAL Common
Part Convergence
Sublayer (CPCS) pad
Bandwidth Based On
1
Fragments
Bits
Sustained cell rate (SCR)
Peak cell rate (PCR)
Peak cell rate (PCR)
Cisco 10000 Series Router Quality of Service Configuration Guide
Bandwidth Distribution Between Queues
SDSL
Class-Based Shaping
No ATM cell
overhead
No AAL Common
Part Convergence
Sublayer (CPCS) pad
No ATM trailer
Class-Based Shaping
No ATM cell
overhead
No AAL Common
Part Convergence
Sublayer (CPCS) pad
5-5