Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 2104)

sFlow Commands
Software Reference for x310 Series Switches
81.10 AlliedWare Plus TM Operating System - Version 5.4.4C C613-50046-01 REV A
sflow max-header-size
This command sets the maximum header size of the ethernet frames sampled on a
specified port. The maximum header size is measured in bytes, referenced from the first
byte of the ethernet destination address and excludes the ethernet FCS fields.
If a sampled ethernet frame is longer than the maximum header size set by this command,
then the frame will be truncated to the first N bytes before being placed in the sFlow
datagram, where N is the maximum header size set by this command.
The no variant of this command resets the max-header-size to its default.
Syntax sflow max-header-size <14-200>
no sflow max-header-size
.
Default The max-header-size is 128 bytes.
Mode Interface Configuration
Usage The header size is measured from the first byte of the Ethernet frame MAC Destination
Address.
For an environment using standard TCP IPv4 over Ethernet frames, consider the following
basic protocol structure:
Ethernet header (including the 4 byte 802.1Q header component) = 18 bytes
IPv4 header = 24 bytes
TCP header = 24 bytes
Total = 66 bytes
See “Determine the max-header-size sampled data” on page 80.9 for more
information on configuring this command.
A similar consideration can be made for an environment using TCP IPv6 over Ethernet:
Ethernet header (including the 4 byte 802.1Q header component) = 18 bytes
IPv6 header = 40 bytes
TCP header = 24 bytes
Total = 82 bytes
Parameter Description
<14-200> The maximum number of header bytes to be sampled.