06-01-2016 07:06 AM
I'm trying to migrate the configurations from a Bigiron to a VDX6740 fabric.
The fact is that on the BigIron I had the possibility to set the rate-limit by entering the following commands on the interface :
rate-limit input 12578000 12582912
Unfortunately I can't find the way to do the same task on the VDX 6740 equipments.
Can someone help me please ?
Thank you !
06-01-2016 07:12 AM - edited 06-01-2016 07:13 AM
From Layer2 Configuration Guide:
Multicast rate limit — A typical multicast rate limiting example is where several ports carry multicast inbound traffic that is tagged with several priority values. Traffic with different priority settings is switched to different outbound ports. The multicast rate limit is set so that the total multicast traffic rate on output ports is less than the specified set rate limit. Multicast rate-limiting commands are not supported on the Brocade VDX 6740 or VDX 8770. On the latter platforms, use BUM storm control instead.
06-01-2016 07:59 AM
You would have to use a policy-map/class/ACL construct to achieve the same. Whilst for a simple rate limit it does look overly complicated the construct does give a great deal more flexibility than the rather simple L2 rate limit offered by BigIron. Here is an example
ip access-list standard inbound
seq 10 permit any
match access-group inbound
police cir 12578000
interface Ten 1/0/1
service-policy in rl
The committed burst size is defined differently on VDX (to the BigIron) in that it is defined as the maximum number of bytes that can be sent if the traffic hasn't been hitting the CIR for a period of time. This helps out TCP goodput. Trial and error may be required to see what works for you. I have seen some rules of thumb about setting the numeric value at 10% of the CIR value.