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doc: document attribute-unchanged directive

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This directive was undocumented, but is the way to configure the
next-hop to be left unchanged for ipv6 setups (in ipv4, a route-map with
`set next-hop unchanged` works fine, but this is unavailable for ipv6) .

Signed-off-by: Raphael Bauduin <rb@raphinou.com>
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rbauduin 2020-02-17 13:13:11 +01:00 committed by Raphael Bauduin
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doc/user/bgp.rst
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@ -1205,6 +1205,14 @@ Configuring Peers
keyword `all` is specified the modification is done also for routes learned
via iBGP.
.. index:: neighbor PEER attribute-unchanged [{as-path|next-hop|med}]
.. clicmd:: neighbor PEER attribute-unchanged [{as-path|next-hop|med}]
This command specifies attributes to be left unchanged for advertisements
sent to a peer. Use this to leave the next-hop unchanged in ipv6
configurations, as the route-map directive to leave the next-hop unchanged
is only available for ipv4.
.. index:: [no] neighbor PEER update-source <IFNAME|ADDRESS>
.. clicmd:: [no] neighbor PEER update-source <IFNAME|ADDRESS>