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According to 'ip link help', one should be able to enter e.g. 'ip link help bridge' to see bridge specific parameters. Doing so on RHEL7 though prints the same help output as for 'ip link help' again.
It's probably sufficient to backport the following upstream commit:
commit 561e650eff679296d3f4c12657721ae769cbc187
Author: vadimk <vadim4j>
Date: Tue Sep 30 08:17:31 2014 +0300
ip link: Shortify printing the usage of link type
Allow to print particular link type usage by:
ip link help [TYPE]
Currently to print usage for some link type it is needed
to use the following way:
ip link { add | del | set } type TYPE help
Signed-off-by: Vadim Kochan <vadim4j>
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHEA-2016-2162.html