mastering QoS

shape average, peak and Bc,Be,Tc values.

good references:

http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a00800a3a25.shtml

Shaping

A

policy-map MPLS_OUT_01
class class-default
shape average 24000
!

R3#sho policy-map interface ser 0/2/0
Serial0/2/0

Service-policy output: MPLS_OUT_01

Class-map: class-default (match-any)
5802 packets, 4878716 bytes
30 second offered rate 26000 bps, drop rate 2000 bps
Match: any
Traffic Shaping
Target/Average Byte Sustain Excess Interval Increment
Rate Limit bits/int bits/int (ms) (bytes)
24000/24000 1998 7992 7992 333 999

Adapt Queue Packets Bytes Packets Bytes Shaping
Active Depth Delayed Delayed Active
- 63 5205 4401540 4562 3836960 yes
R3#

B

policy-map MPLS_OUT_01
class class-default
shape average 24000 1024
!

R3#sho policy-map interface ser 0/2/0
Serial0/2/0

Service-policy output: MPLS_OUT_01

Class-map: class-default (match-any)
6385 packets, 5368341 bytes
30 second offered rate 27000 bps, drop rate 2000 bps
Match: any
Traffic Shaping
Target/Average Byte Sustain Excess Interval Increment
Rate Limit bits/int bits/int (ms) (bytes)
24000/24000 256 1024 1024 42 128

Adapt Queue Packets Bytes Packets Bytes Shaping
Active Depth Delayed Delayed Active
- 63 5722 4836333 5079 4271753 yes
R3#

C

policy-map MPLS_OUT_01
class class-default
shape average 24000 1024 0
!

R3#sho policy-map interface ser 0/2/0
Serial0/2/0

Service-policy output: MPLS_OUT_01

Class-map: class-default (match-any)
6792 packets, 5711636 bytes
30 second offered rate 26000 bps, drop rate 2000 bps
Match: any
Traffic Shaping
Target/Average Byte Sustain Excess Interval Increment
Rate Limit bits/int bits/int (ms) (bytes)
24000/24000 128 1024 0 42 128

Adapt Queue Packets Bytes Packets Bytes Shaping
Active Depth Delayed Delayed Active
- 65 6085 5144728 5442 4580148 yes
R3#

D

policy-map MPLS_OUT_01
class class-default
shape peak 24000
!

R3#sho policy-map interface ser 0/2/0
Serial0/2/0

Service-policy output: MPLS_OUT_01

Class-map: class-default (match-any)
7258 packets, 6102204 bytes
30 second offered rate 26000 bps, drop rate 0 bps
Match: any
Traffic Shaping
Target/Average Byte Sustain Excess Interval Increment
Rate Limit bits/int bits/int (ms) (bytes)
48000/24000 1998 7992 7992 333 1998

Adapt Queue Packets Bytes Packets Bytes Shaping
Active Depth Delayed Delayed Active
- 0 6580 5577004 5895 4975862 no
R3#