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Beginner

SPAN rate-limit auto on Nexus 7000

Hi,

 

I would like to understand how the command "rate-limit auto" works on Nexus 7000 for SPAN.

 

Below its the official explanation from Cisco but it is not clear to me.

 

For example if my destination interface is 10G and the source traffic is 6G, what is going to be the rate-limit and when the rate-limit it will actually work and start dropping packets?

 

Could you provide a simple example?

 

Auto mode—Automatically calculates the rate limit on a per-gigabyte basis as follows: destination bandwidth / aggregate source bandwidth. For example, if the rate limit per gigabyte is 0.5, for every 1G of source traffic, only 0.5G of packets are spanned.

For ingress traffic, the per-gigabyte limit is applied to each forwarding engine of the F Series module based on how many ports are used as the SPAN source so that the source can be spanned at the maximum available bandwidth. For egress traffic, the per-gigabyte limit is applied to each forwarding engine of the F Series module without considering how many ports are used as the SPAN source.

 

Thanks in advance for your help.

Stelios

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