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Merge pull request #14502 from opensourcerouting/fix/document_on_how_to_set_the_distance_from_linux

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doc: Add an example on how to set a distance for a route from the kernel
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Donald Sharp 2023-09-28 08:15:25 -04:00 committed by GitHub
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2 changed files with 33 additions and 4 deletions
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9
doc/user/bgp.rst
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@ -461,6 +461,15 @@ Administrative Distance Metrics
Sets the administrative distance for a particular route.
If the system has a static route configured from the kernel, it has a
distance of 0. In some cases, it might be useful to override the route
from the FRR. E.g.: Kernel has a statically configured default route,
and you received another default route from the BGP and want to install
it to be preferred over the static route. In such a case, you MUST set
a higher distance from the kernel.
.. seealso:: :ref:`administrative-distance`
.. _bgp-requires-policy:
Require policy on EBGP

20
doc/user/zebra.rst
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@ -374,6 +374,8 @@ outgoing interface
Resolve PBR nexthop via ip neigh tracking
.. _administrative-distance:
Administrative Distance
=======================
@ -430,6 +432,24 @@ is interpreted as the Administrative Distance and the low three bytes
are read in as the metric. This special case is to facilitate VRF
default routes.
.. code-block:: shell
$ # Set administrative distance to 255 for Zebra
$ ip route add 192.0.2.0/24 metric $(( 2**32 - 2**24 )) dev lo
$ vtysh -c 'show ip route 192.0.2.0/24 json' | jq '."192.0.2.0/24"[] | (.distance, .metric)'
255
0
$ # Set administrative distance to 192 for Zebra
$ ip route add 192.0.2.0/24 metric $(( 2**31 + 2**30 )) dev lo
$ vtysh -c 'show ip route 192.0.2.0/24 json' | jq '."192.0.2.0/24"[] | (.distance, .metric)'
192
0
$ # Set administrative distance to 128, and metric 100 for Zebra
$ ip route add 192.0.2.0/24 metric $(( 2**31 + 100 )) dev lo
$ vtysh -c 'show ip route 192.0.2.0/24 json' | jq '."192.0.2.0/24"[] | (.distance, .metric)'
128
100
Route Replace Semantics
=======================