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doc: Explain ecmp building and startup for zebra

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Explain the --enable-ecmp=X configure option as well as
modify the zebra user doc to explain the -e X option.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2018-05-01 18:02:51 -04:00
parent 1c96f2fb96
commit 0d8df93443
2 changed files with 15 additions and 0 deletions
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8
doc/user/installation.rst
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@ -176,6 +176,14 @@ customize the build to include or exclude specific features and dependencies.
With this option, we provide a way to strip out these characters for APK dev
package builds.
.. option:: --enable-multipath=X
Compile FRR with up to X way ECMP supported. This number can be from 0-999.
For backwards compatability with older configure options when setting X = 0,
we will build FRR with 64 way ECMP. This is needed because there are
hardcoded arrays that FRR builds towards, so we need to know how big to
make these arrays at build time.
You may specify any combination of the above options to the configure
script. By default, the executables are placed in :file:`/usr/local/sbin`
and the configuration files in :file:`/usr/local/etc`. The :file:`/usr/local/`

7
doc/user/zebra.rst
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@ -31,6 +31,13 @@ Besides the common invocation options (:ref:`common-invocation-options`), the
When program terminates, retain routes added by zebra.
.. option:: -e X, --ecmp X
Run zebra with a limited ecmp ability compared to what it is compiled to.
If you are running zebra on hardware limited functionality you can
force zebra to limit the maximum ecmp allowed to X. This number
is bounded by what you compiled FRR with as the maximum number.
.. program:: configure
.. _interface-commands: