User manual

NMS300 Network Management System Application
Manage sFlow User Manual238
5. Under sFlow, click the sFlow Settings link.
6. Enter the sFlow settings:
• History Data Save in (days). From the menu, select how long sFlow data is saved.
By default, the data is saved for 15 days. You can also select 3, 5, or 7 days.
• sFlow Collection Server. Enter the IP address of the sFlow collection server.
•
sFlow Collection Server Port. Enter the port number for the sFlow collection server.
By default, the port number is 6343.
•
Sampling Rate. Enter the rate at which the data is sampled.
By default, the rate is 1024, which means that 1 in 1024 packets is sampled. You can
set a higher sampling rate, which might result in a higher accuracy but increases the
sFlow traf
fic.
You can set the sampling rate from 1024 to 65536 packets.
• Max Header Size. Enter the maximum size of the header.
By default, the size is 128, which means that a maximum of 128 bytes is sampled
from a packet. You can set the maximum header size from 20 to 256 bytes.
7. Click the Submit button.
Your changes are saved.
Manage sFlow sources
An sFlow system consists of multiple devices performing two types of sampling:
• Random sampling of packets or application-layer operations
• T
ime-based sampling of counters
The sampled packet and operation information, referred to as flow samples, and the sampled
counter information, referred to as counter samples, are sent as sFlow datagrams to the
application, which functions as the sFlow collector.
sFlow is supported for managed switches only (see
NETGEAR fully managed switches on
page 13) and for a maximum of 16 interfaces at a time.