How to Calculate BC and BE in NCS5500

[jon_panes24]

Hi All,

Anyone that is familiar how NCS5501 calculates the CIR/PIR, BC and BE values. Im not sure how the values are being calculated here

Policy map is configured below and applied to a tengig interface

policy-map test-policer
class PCP-ALL
police rate 102400 kbps peak-rate 102400 kbps
!
!
class class-default
!
end-policy-map

interface TenGigE0/0/0/10
service-policy input test-policer
shutdown

!

RP/0/RP0/CPU0:NCS-5501-SYS-ENNI-3#show qos interface TenGigE0/0/0/10 input
Tue Jul 12 19:42:22.363 NZST
NOTE:- Configured values are displayed within parentheses
Interface TenGigE0/0/0/10 ifh 0xc0 -- input policy
NPU Id: 0
Total number of classes: 2
Interface Bandwidth: 10000000 kbps
Policy Name: test-policer
SPI Id: 0x0
Accounting Type: Layer2 (Include Layer 2 encapsulation and above)
------------------------------------------------------------------------------
Level1 Class = PCP-ALL

Policer Bucket ID = 0x121
Policer Stats Handle = 0x0
Policer committed rate = 102656 kbps (102400 kbits/sec)
Policer peak rate = 102678 kbps (102400 kbits/sec)
Policer conform burst = 127872 bytes (default)
Policer exceed burst = 255744 bytes (default)

Level1 Class = class-default

Default Policer Bucket ID = 0x120
Default Policer Stats Handle = 0x0

[paul driver]

Hello
My understadning policng BC/BE is calculated based on the interface time intervel rate (tc),

BC/BE=CIR/32
or
BC/BE=CIR*0,25/8

Example:
TC = 0.25
CIR 1000000
BC=1000000/32 = 31250
or
BC=0.25*1000000/8 = 31250