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BGP: implement Adj-RIB-Out

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The patch implements optional internal export table to a channel and
hooks it to BGP so it can be used as Adj-RIB-Out. When enabled, all
exported (post-filtered) routes are stored there. An export table can be
examined using e.g. 'show route export table bgp1.ipv4'.
This commit is contained in:
Ondrej Zajicek (work)
2019-08-13 18:22:07 +02:00
parent dfe63ed84d
commit b7d7599ce3
9 changed files with 146 additions and 1 deletions
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doc/bird.sgml
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@@ -2705,6 +2705,16 @@ be used in explicit configuration.
be examined later by <cf/show route/, and can be used to reconfigure
import filters without full route refresh. Default: off.
<tag><label id="bgp-export-table">export table <m/switch/</tag>
A BGP export table contains all routes sent to given BGP neighbor, after
application of export filters. It is also called <em/Adj-RIB-Out/ in BGP
terminology. BIRD BGP by default operates without export tables, in
which case routes from master table are just processed by export filters
and then announced by BGP. Enabling <cf/export table/ allows to store
routes after export filter processing, so they can be examined later by
<cf/show route/, and can be used to eliminate unnecessary updates or
withdraws. Default: off.
<tag><label id="bgp-secondary">secondary <m/switch/</tag>
Usually, if an export filter rejects a selected route, no other route is
propagated for that network. This option allows to try the next route in