Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 2090)

sFlow Introduction and Configuration
Software Reference for x310 Series Switches
80.10 AlliedWare Plus TM Operating System - Version 5.4.4C C613-50046-01 REV A
Step 6: Review and adjust settings
Because sFlow traffic loading will vary with the traffic profile, the following
general assumptions are made. The following traffic profile are assumed.
« 50% of frames are <200 bytes long
« 40% of frames are >1400 bytes long
The following settings are:
« 12 x 1 Gbps ports are being sampled
« sFlow max-header size = 68 bytes
« sampling rate (N = 2750)
« average port utilization is assumed to be approximately 60%
« average data rate to the collector assumed to be approximately 250 Kbps
When setting the sampling rate, consider the following factors that will affect the
CPU load. This load will increase (not necessarily linearly) as you:
« increase the number of ports configured
« increase the port speeds
« decrease the sampling rate
« increase the max-header-size
For this configuration the average sFlow collector traffic is expected to be
approximately 250 kbps. In this example the agent-to-collector traffic will be
shared with non sFlow traffic. Although not described in this example, you can
specifically configure the collector port to route only sFlow traffic. To do this you
would need to assign a separate VLAN (and IP address) to the agent-to collector
interface and direct your sFlow traffic to this interface.
We advise that you ensure adequate bandwidth is provided for both the sFlow
and general traffic that could share its network connection.
We will now use these settings to configure the network.