Ganesh Murthy commented on DISPATCH-966:

Thanks Marcel for finding the problem. I was looking at the last part of your 
comment - "What I did notice it that proton trace logging is showing 
inconsistent settlement flag for messages that are split over multiple transfer 
frames " and was wondering if what you are observing would be fixed by 

Please take a look and let me know. Thank you

> 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: Blocker
>             Fix For: 1.1.0
>         Attachments: inconsistent-settlement.log, 
> 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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