docs: Add High-level design of ovn-spekaer (#1609)

Co-authored-by: Edison Meng (孟志慧)-浪潮数据 <mengzhihui01@inspur.com>
kubeovn · Jun 15, 2022 · 0b84039 · 0b84039
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diff --git a/docs/bgp.md b/docs/bgp.md
@@ -3,6 +3,12 @@
 Kube-OVN supports advertise pod/subnet ips to external networks by BGP protocol. To enable BGP advertise function, you
 need to install kube-ovn-speaker and annotate pods/subnets that need to be exposed.
 
+## High-level design of ovn-spekaer
+
+![ovn-speaker.png](ovn-speaker.png)
+kube-ovn-speaker periodically lists Pod/subnet/service resource information of kubernetes apiServer.
+Check the obtained Pod/subnet/service resources, select the annotation ovn.kubernetes.io/bgp=true and
+the resources that are not advertised by BGP use BGP to advertise externally.
 ## List of Options
 ```text
 Usage of ovn-speaker:

diff --git a/docs/ovn-speaker.png b/docs/ovn-speaker.png