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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. 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: .. _bgp-requires-policy:
Require policy on EBGP 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 Resolve PBR nexthop via ip neigh tracking
.. _administrative-distance:
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 are read in as the metric. This special case is to facilitate VRF
default routes. 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 Route Replace Semantics
======================= =======================