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ip-address.8: Document autojoin flag 

Description copied from related kernel support commit message with a
little tailoring to fit.

While at it, fix font of non-terminal CONFFLAG-LIST in synopsis.

Signed-off-by: Phil Sutter <phil@nwl.cc>
This commit is contained in:
Phil Sutter 2016-07-12 09:56:16 +02:00 committed by Stephen Hemminger
parent 247ace6115
commit 6acf086c2b
1 changed files with 23 additions and 2 deletions
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25
man/man8/ip-address.8.in
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@ -77,14 +77,15 @@ ip-address \- protocol address management
.IR FLAG " := " .IR FLAG " := "
.RB "[ " permanent " | " dynamic " | " secondary " | " primary " |" .RB "[ " permanent " | " dynamic " | " secondary " | " primary " |"
.RB [ - ] tentative " | [" - ] deprecated " | [" - ] dadfailed " |" .RB [ - ] tentative " | [" - ] deprecated " | [" - ] dadfailed " |"
.BR temporary " | " CONFFLAG-LIST " ]" .BR temporary " |"
.IR CONFFLAG-LIST " ]"
.ti -8 .ti -8
.IR CONFFLAG-LIST " := [ " CONFFLAG-LIST " ] " CONFFLAG .IR CONFFLAG-LIST " := [ " CONFFLAG-LIST " ] " CONFFLAG
.ti -8 .ti -8
.IR CONFFLAG " := " .IR CONFFLAG " := "
.RB "[ " home " | " mngtmpaddr " | " nodad " | " noprefixroute " ]" .RB "[ " home " | " mngtmpaddr " | " nodad " | " noprefixroute " | " autojoin " ]"
.ti -8 .ti -8
.IR LIFETIME " := [ " .IR LIFETIME " := [ "
@ -249,6 +250,26 @@ address, and don't search for one to delete when removing the address. Changing
an address to add this flag will remove the automatically added prefix route, an address to add this flag will remove the automatically added prefix route,
changing it to remove this flag will create the prefix route automatically. changing it to remove this flag will create the prefix route automatically.
.TP
.B autojoin
Joining multicast groups on Ethernet level via
.B "ip maddr"
command does not work if connected to an Ethernet switch that does IGMP
snooping since the switch would not replicate multicast packets on ports that
did not have IGMP reports for the multicast addresses.
Linux VXLAN interfaces created via
.B "ip link add vxlan"
have the
.B group
option that enables them to do the required join.
Using the
.B autojoin
flag when adding a multicast address enables similar functionality for
Openvswitch VXLAN interfaces as well as other tunneling mechanisms that need to
receive multicast traffic.
.SS ip address delete - delete protocol address .SS ip address delete - delete protocol address
.B Arguments: .B Arguments:
coincide with the arguments of coincide with the arguments of