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doc: Document update-source <IFNAME> command better

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There was a question in regards to how the update-source
choose the ip address for the source when using the `update-source`
command in BGP.  Upon looking at the code, I was a but surprised,
so I decided to document this behavior.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>
This commit is contained in:
Donald Sharp 2024-02-05 11:55:07 -05:00
parent cac925f005
commit 5842a70a19
1 changed files with 5 additions and 3 deletions
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8
doc/user/bgp.rst
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@ -1626,10 +1626,12 @@ Configuring Peers
.. clicmd:: neighbor PEER update-source <IFNAME|ADDRESS> .. clicmd:: neighbor PEER update-source <IFNAME|ADDRESS>
Specify the IPv4 source address to use for the :abbr:`BGP` session to this Specify the IPv4 or IPv6 source address to use for the :abbr:`BGP` session to this
neighbour, may be specified as either an IPv4 address directly or as an neighbour, may be specified as either an IP address directly or as an
interface name (in which case the *zebra* daemon MUST be running in order interface name (in which case the *zebra* daemon MUST be running in order
for *bgpd* to be able to retrieve interface state). for *bgpd* to be able to retrieve interface state). When there are multiple
addresses on the choosen IFNAME then BGP will use the address that matches
the most number of bits in comparison to the destination peer address.
.. code-block:: frr .. code-block:: frr