09-23-2010 10:21 PM - edited 03-04-2019 09:53 AM
Dear Experts,
I need 42 mb rate-limit on WAN interface in cisco 3845 router , i already rate-limit on sub-interface and it's working fine
e.g rate-limit input 2048000 64000 64000 conform-action transmit exceed-action drop
rate-limit output 2048000 64000 64000 conform-action transmit exceed-action drop
same like as per given above conig which is 2 mb and brust 64000 so i need 42 mb rate-limit on wan interac with brust
i bit confuse how many brust when i rate-limit 42 mb in place of 64000 brust.
so which is the exact command 42 mb rate-limit with brust i need to apply on WAN interface.
Thanks in ADV,
Solved! Go to Solution.
09-24-2010 12:36 AM
The configuration according to cisco should be as follows but there is no hard & fast rule for BC and BE value. You can change it according to your convenience
rate-limit input 44040192 8257536 16515072 conform-action transmit exceed-action drop
rate-limit output 44040192 8257536 16515072 conform-action transmit exceed-action drop
Cheers
Sumit
09-23-2010 11:43 PM
Hi,
Rate limit uses token bucket algorithm. The BC or normal burst is the depth of the bucket. Packet will be transmitted if there is enough token in the bucket. The max burst is used when there is not enough token in the bucket.
When we use Rate-Limit(CAR) Cisco recomends these calculations for the normal and extended burst parameters:
Burst-normal = configured rate * 1/8 * 1.5 seconds (1/8 for convert bit to byte)
Burst-max = Burst-normal * 2
Check this link for more details.
http://www.cisco.com/en/US/docs/ios/qos/command/reference/qos_q1.html#wp1054922
I hope this can help you out
Sumit
09-24-2010 12:02 AM
Dear Sumitava,
Thanks for your good explanation by given this link but there is huge in details so i again confuse.
So pease i need exact command for 42 mb rate-limit on gi wan interface
like :
rate-limit input 42mb ( ???? ) brust (???) brust (???) conform-action transmit exceed-action drop
rate-limit output 42mb ( ???? ) brust (???) brust (???) conform-action transmit exceed-action drop
Thanks in ADV,
09-24-2010 12:36 AM
The configuration according to cisco should be as follows but there is no hard & fast rule for BC and BE value. You can change it according to your convenience
rate-limit input 44040192 8257536 16515072 conform-action transmit exceed-action drop
rate-limit output 44040192 8257536 16515072 conform-action transmit exceed-action drop
Cheers
Sumit
09-24-2010 01:32 AM
Dear Sumit,
Thank you very much i will try to do this command for 42 mb rate-limit on gi int in 3845 router and then let you know.
Thanks once again!!!
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