Specifications

B-530
Cisco MWR 2941 Mobile Wireless Edge Router Software Configuration Guide, Release 12.2(33)MRB
OL-21227-02
Appendix B Cisco MWR 2941 Router Command Reference
show policy-map interface
Formula for Calculating the CIR: Example
When calculating the CIR, the following formula is used:
• CIR percentage specified (as shown in the output from the show policy-map command) *
bandwidth (BW) of the interface (as shown in the output from the show interfaces command) = total
bits per second
According to the output from the show interfaces command for the serial 2/0 interface, the interface has
a bandwidth (BW) of 2048 kbps.
Router# show interfaces serial2/0
Serial2/0 is administratively down, line protocol is down
Hardware is M4T
MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec, rely 255/255, load 1/255
The following values are used for calculating the CIR:
20 % * 2048 kbps = 409600 bps
Formula for Calculating the PIR: Example
When calculating the PIR, the following formula is used:
• PIR percentage specified (as shown in the output from the show policy-map command) * bandwidth
(BW) of the interface (as shown in the output from the show interfaces command) = total bits per
second
According to the output from the show interfaces command for the serial 2/0 interface, the interface has
a bandwidth (BW) of 2048 kbps.
Router# show interfaces serial2/0
Serial2/0 is administratively down, line protocol is down
Hardware is M4T
MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec, rely 255/255, load 1/255
The following values are used for calculating the PIR:
40 % * 2048 kbps = 819200 bps
Note Discrepancies between this total and the total shown in the output from the show policy-map
interface command can be attributed to a rounding calculation or to differences associated with
the specific interface configuration.
Formula for Calculating the Committed Burst (bc): Example
When calculating the bc, the following formula is used:
• The bc in milliseconds (as shown in the show policy-map command) * the CIR in bits per seconds
= total number bytes
The following values are used for calculating the bc:
300 ms * 409600 bps = 15360 bytes
Formula for Calculating the Excess Burst (be): Example
When calculating the bc and the be, the following formula is used:
• The be in milliseconds (as shown in the show policy-map command) * the PIR in bits per seconds
= total number bytes