08-07-2009
:a is just a label. ta says that as long as the expression is true go back to the label a and do it again.
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LEARN ABOUT MOJAVE
ip-addrlabel
IP-ADDRLABEL(8) Linux IP-ADDRLABEL(8)
NAME
ip-addrlabel - protocol address label management
SYNOPSIS
ip addrlabel { COMMAND | help }
ip addrlabel { add | del } prefix PREFIX [ dev DEV ] [ label NUMBER ]
ip addrlabel { list | flush }
DESCRIPTION
IPv6 address labels are used for address selection; they are described in RFC 3484. Precedence is managed by userspace, and only the label
itself is stored in the kernel.
ip addrlabel add - add an address label
add an address label entry to the kernel.
prefix PREFIX
dev DEV
the outgoing interface.
label NUMBER
the label for the prefix. 0xffffffff is reserved.
ip addrlabel del - delete an address label
delete an address label entry from the kernel. Arguments: coincide with the arguments of ip addrlabel add but the label is not required.
ip addrlabel list - list address labels
list the current address label entries in the kernel.
ip addrlabel flush - flush address labels
flush all address labels in the kernel. This does not restore any default settings.
SEE ALSO
ip(8)
AUTHOR
Manpage by Yoshifuji Hideaki /
iproute2 20 Dec 2011 IP-ADDRLABEL(8)