one contrail_vrouter_agent will connect to two contrail_control that is two xmpp_server

1)
Subscriber or Client List from discovery server.
http://127.0.0.1:5998/clients

In this picture, "vpc-cp1" (contrail-vrouter-agent) is the compute node, which is connected to "xmpp-server" running on contrail_control "vpc-cfg1" and "vpc-ctrl2".

Here "vpc-cp1" (contrail-vrouter-agent) is the Subscriber or Client which is connected to Publisher or Service "xmpp-server".

2)
Subscriber or Client List from discovery server when "contrail-vrouter-agent" down in compute node "vpc_cp1".

In this picture, you can't find entry of "vcp_cp1" (contrail-vrouter-agent).