docs: Add externalTrafficPolicy=Local description to BGP CPlane doc

As we now implemented the support for externalTrafficPolicy in 24e37ed. Signed-off-by: Yutaro Hayakawa <yutaro.hayakawa@isovalent.com>
cilium · Jun 8, 2023 · e696c41 · e696c41
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commit e696c41
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diff --git a/Documentation/network/bgp-control-plane.rst b/Documentation/network/bgp-control-plane.rst
@@ -291,6 +291,13 @@ io.kubernetes.service.namespace ``.meta.namespace``
 io.kubernetes.service.name      ``.meta.name``
 =============================== ===================
 
+Semantics of the externalTrafficPolicy: Local
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+When the service has ``externalTrafficPolicy: Local``, ``BGP Control Plane`` keeps track
+of the endpoints for the service on the local node and stops advertisement when there's
+no local endpoint.
+
 Architecture
 ------------