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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi,<o:p></o:p></p><p class=MsoNormal>I want to setup federation b/w two brokers called A (Downstream) and B (Upstream). We have redundant network link between these two brokers. B has two IPs, named IP1 and IP2. I have setup federation in following way<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I created two upstreams:<o:p></o:p></p><p style='margin:0in;margin-bottom:.0001pt'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>rabbitmqctl set_parameter federation-upstream site-b-1 '{"uri":"amqp://IP1","max-hops":1}'<o:p></o:p></span></b></p><p style='margin:0in;margin-bottom:.0001pt'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>rabbitmqctl set_parameter federation-upstream site-b-2 '{"uri":"amqp://IP2","max-hops":1}'<o:p></o:p></span></b></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Then I created one policy:<o:p></o:p></p><p style='margin:0in;margin-bottom:.0001pt'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>rabbitmqctl set_policy federate-test "ExchangeName" '{"federation-upstream-set":"MyUpstreamSet"}'<o:p></o:p></span></b></p><p style='margin:0in;margin-bottom:.0001pt'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p style='margin:0in;margin-bottom:.0001pt'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Then I put the both upstreams in the upstream set:<o:p></o:p></span></p><p style='margin:0in;margin-bottom:.0001pt'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>rabbitmqctl set_parameter federation-upstream-set MyUpstreamSet '[{"upstream":"site-b-1","exchange":" ExchangeName"}, {"upstream":"site-b-2","exchange":" ExchangeName"}]'<o:p></o:p></span></b></p><p style='margin:0in;margin-bottom:.0001pt'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal>I have tested this setup and it is working fine. I have few questions regarding this setup:<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Is it wise to create a single upstream with two uris? Or the above setup is good and will provide network high availability incase if a network link goes down?<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Though we have specified two upstream, but when we list exchanges and queues on broker B it shows only one x-federation-upstream and a single upstream queue, and there is no duplication of messages. This is the exact behavior we expect, but I want to understand that how does RabbitMQ achieve this behavior and avoid duplication. It would be a great help if you can point me to some documentation or a link.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Any suggestion or advice to improve this configuration.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal>Punit<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>