Marcel Meulemans commented on DISPATCH-966:

Added to the configuration and ran the test again several times. However now I 
see some things I did not expect; the network seems to come up correctly, but 
after a while it seems to fail in a weird way. The inter-router connections do 
not seems to drop anymore but routing via the network does not seem to work 
(i.e.ROUTER_LS (info) Computed next hops: {} and qdstat -n show only a single 
router). Maybe this is the issue unmasked by allowing unsettled multicasts?

I attached two more file:
 * the logs of router-0 (from router start until slightly after the network 
fails) at info level
 * a tcpdump to the inter router communication to an from router-0 (tcpdump -i 
eth0 tcp port 55672 -s 65535)

I hope this helps (the dump is fairly large, so I hope you can find any hidden 


> Qpid dispatch unstable inter-router connections
> -----------------------------------------------
>                 Key: DISPATCH-966
>                 URL: https://issues.apache.org/jira/browse/DISPATCH-966
>             Project: Qpid Dispatch
>          Issue Type: Bug
>          Components: Routing Engine
>    Affects Versions: 1.0.1
>            Reporter: Marcel Meulemans
>            Assignee: Ted Ross
>            Priority: Major
>         Attachments: qdrouterd-unsettled-true.log, qdrouterd.conf, 
> qdrouterd.log, router-unsettled-true.dump, router.dump
> I am running a three node fully connected mesh of dispatch routers with 10000 
> attached clients and I am seeing some unstable inter-router connections (I am 
> sending around 1000 small, less than 1K, messages per second through the 
> network). The inter-router connections fail every so many seconds with the 
> message:
> {{Connection to router-2:55672 failed: amqp:session:invalid-field sequencing 
> error, expected delivery-id 7, got 6}}
> (the numbers 7 and 6 differ per connection loss)
> In wireshark, using the attached tcpdump capture, I can see that every time 
> before the inter router connection is dropped, therw is a rejected 
> disposition with the message:
> {{Condition: qd:forbidden}}
> {{Description: Deliveries to a multicast address must be pre-settled}}
> The routers are connected as follows:
>  * router-0 -> router-1
>  * router-0 -> router-2
>  * router-1 -> router-2
> The routers are running as a docker container (debian stretch) on google 
> compute engine machines (every router on a separate node).
> Attached are:
>  * my qdrouter.conf (from one of the routers)
>  * a log snippet from router-0 at debug level from connection drop to 
> connection re-established to connection drop again.
>  * a tcpdump capture of the inter-router connection between router-0 and 
> router-1 during which several of the failures occur
> Versions:
>  * qpid-dispatch@1.0.1-rc1
>  * qpid-proton@0.20.0
> [^qdrouterd.log]
> [^qdrouterd.conf]
> [^router.dump]

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