FR Bc & Be values

[Hunt.Lee]

Hi NetPro ladies & gents,

I have a 1MB FR circuit, I'm new to FRTS and wondering if someone can show me how Be is calculated. The 1MB circuit is only used for data but not voice.

I think Bc is CIR / 8, but not sure how Be should be computed.

map-class frame-relay FRClassA

frame-relay cir 2048000

frame-relay bc 256000

frame-relay be 256000

frame-relay mincir 1024000

frame-relay priority-group 1

!

Would be greatly appreciated if anyone can shed some light on this.

Cheers

[jolmo]

Hi Hunt

The following parameters are used by FR Traffic Policing/Shaping:

- Tc

A (computed or configured) time interval during which committed and excess traffic is measured and monitored. This time interval is defined in the following ways:

- The committed burst size (Bc) for a Frame Relay virtual circuit divided by the committed information rate (CIR).

- The excess burst size (Be) for a Frame Relay virtual circuit divided by the excess information rate (EIR).

- Bc

The committed burst size, in bits. This configured parameter specifies how many bits of committed traffic are permitted during any given Tc interval.

- Be

The excess burst size, in bits. This configured parameter specifies how many bits of excess traffic are permitted during any given Tc interval.

- CIR

The committed information rate, in bits per second. This configured parameter specifies the long-term average committed traffic rate to enforce.

- EIR

The excess information rate, in bits per second. This computed value shows the long-term average excess traffic rate being enforced.

This link is very useful in understanding FRTS:

http://www.cisco.com/en/US/tech/tk713/tk237/technologies_configuration_example09186a00800942f8.shtml

Hope this helps