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doc: add note for IPv4 multicast application

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Add a note to indicate that only first four ports can be
tested with this application.

Signed-off-by: Hemant Agrawal <hemant.agrawal@nxp.com>
Acked-by: John McNamara <john.mcnamara@intel.com>
This commit is contained in:
Hemant Agrawal 2017-06-23 12:53:59 +05:30 committed by Thomas Monjalon
parent 99ad488b68
commit 7c8f4eedeb
1 changed files with 6 additions and 0 deletions
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6
doc/guides/sample_app_ug/ipv4_multicast.rst
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@ -51,6 +51,12 @@ The lookup method is the Four-byte Key (FBK) hash-based method.
The lookup table is composed of pairs of destination IPv4 address (the FBK)
and a port mask associated with that IPv4 address.
.. note::
The max port mask supported in the given hash table is 0xf, so only first
four ports can be supported.
If using non-consecutive ports, use the destination IPv4 address accordingly.
For convenience and simplicity, this sample application does not take IANA-assigned multicast addresses into account,
but instead equates the last four bytes of the multicast group (that is, the last four bytes of the destination IP address)
with the mask of ports to multicast packets to.