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-rw-r--r--doc/bird.sgml9
1 files changed, 9 insertions, 0 deletions
diff --git a/doc/bird.sgml b/doc/bird.sgml
index e531da40..8d93f8ac 100644
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -2565,6 +2565,15 @@ be used in explicit configuration.
<p>BGP channels have additional config options (together with the common ones):
<descrip>
+ <tag><label id="bgp-mandatory">mandatory <m/switch/</tag>
+ When local and neighbor sets of configured AFI/SAFI pairs differ,
+ capability negotiation ensures that a common subset is used. For
+ mandatory channels their associated AFI/SAFI must be negotiated
+ (i.e., also announced by the neighbor), otherwise BGP session
+ negotiation fails with <it/'Required capability missing'/ error.
+ Regardless, at least one AFI/SAFI must be negotiated in order to BGP
+ session be successfully established. Default: off.
+
<tag><label id="bgp-next-hop-keep">next hop keep <m/switch/|ibgp|ebgp</tag>
Do not modify the Next Hop attribute and advertise the current one
unchanged even in cases where our own local address should be used