QOS - CAR

CAR or Committed Access Rate

The lab topology and requirement in the post is the same as with the QOS - GTS post.
This time it is achieved using CAR.

TOPOLOGY: R2 ------ R3 ------ R1 ------ R4

The LAB requirement is to use CAR to limit the traffic flow to R4.
Packets destined to R4 loopback (150.1.4.4) is allowed 16k and packets destined to R4 fa0/0 (155.1.148.4) is allowed only 8K.



Router_1
int fa0/0
rate-limit access-group 100 8000 1000 2000 conform-action continue exceed-action drop
rate-limit access-group 101 16000 1000 2000 conform-action continue exceed-action drop

I execute pings from R3 and R2

Router_3#ping 155.1.148.4 size 4000 repeat 1000 timeout 1
Router_2#ping 155.1.148.4 size 4000 repeat 1000 timeout 1


I now verify the rate limiting on R1

Router 1
show int fa0/0 rate-limit
FastEthernet0/0
Output
matches: access-group 100
params: 8000 bps, 1500 limit, 2000 extended limit
conformed 59 packets, 65866 bytes; action: transmit
exceeded 136 packets, 199464 bytes; action: drop
last packet: 20ms ago, current burst: 1810 bytes
last cleared 00:01:04 ago, conformed 8000 bps, exceeded 24000 bps
matches: access-group 101
params: 16000 bps, 1500 limit, 2000 extended limit
conformed 95 packets, 130030 bytes; action: transmit
exceeded 100 packets, 135300 bytes; action: drop
last packet: 36ms ago, current burst: 1676 bytes
last cleared 00:01:04 ago, conformed 16000 bps, exceeded 16000 bps