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From 88f9c8ccf815fdc170e0f160335acdaacadc669e Mon Sep 17 00:00:00 2001
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From: Phil Sutter <psutter@redhat.com>
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Date: Wed, 20 Jul 2016 22:59:33 +0200
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Subject: [PATCH] ip-address.8: Document autojoin flag
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1333513
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Upstream Status: iproute2.git commit 6acf086c2bf3e
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commit 6acf086c2bf3e94ceed984acd39936e216342e16
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Author: Phil Sutter <phil@nwl.cc>
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Date: Tue Jul 12 09:56:16 2016 +0200
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ip-address.8: Document autojoin flag
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Description copied from related kernel support commit message with a
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little tailoring to fit.
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While at it, fix font of non-terminal CONFFLAG-LIST in synopsis.
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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---
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man/man8/ip-address.8.in | 25 +++++++++++++++++++++++--
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1 file changed, 23 insertions(+), 2 deletions(-)
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diff --git a/man/man8/ip-address.8.in b/man/man8/ip-address.8.in
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index 8d34adb..c954ab3 100644
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--- a/man/man8/ip-address.8.in
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+++ b/man/man8/ip-address.8.in
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@@ -75,14 +75,15 @@ ip-address \- protocol address management
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.IR FLAG " := "
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.RB "[ " permanent " | " dynamic " | " secondary " | " primary " |"
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.RB [ - ] tentative " | [" - ] deprecated " | [" - ] dadfailed " |"
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-.BR temporary " | " CONFFLAG-LIST " ]"
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+.BR temporary " |"
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+.IR CONFFLAG-LIST " ]"
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.ti -8
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.IR CONFFLAG-LIST " := [ " CONFFLAG-LIST " ] " CONFFLAG
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.ti -8
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.IR CONFFLAG " := "
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-.RB "[ " home " | " mngtmpaddr " | " nodad " | " noprefixroute " ]"
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+.RB "[ " home " | " mngtmpaddr " | " nodad " | " noprefixroute " | " autojoin " ]"
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.ti -8
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.IR LIFETIME " := [ "
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@@ -244,6 +245,26 @@ address, and don't search for one to delete when removing the address. Changing
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an address to add this flag will remove the automatically added prefix route,
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changing it to remove this flag will create the prefix route automatically.
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+.TP
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+.B autojoin
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+Joining multicast groups on Ethernet level via
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+.B "ip maddr"
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+command does not work if connected to an Ethernet switch that does IGMP
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+snooping since the switch would not replicate multicast packets on ports that
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+did not have IGMP reports for the multicast addresses.
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+
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+Linux VXLAN interfaces created via
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+.B "ip link add vxlan"
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+have the
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+.B group
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+option that enables them to do the required join.
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+
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+Using the
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+.B autojoin
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+flag when adding a multicast address enables similar functionality for
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+Openvswitch VXLAN interfaces as well as other tunneling mechanisms that need to
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+receive multicast traffic.
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+
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.SS ip address delete - delete protocol address
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.B Arguments:
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coincide with the arguments of
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--
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1.8.3.1
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