Ted Ross resolved DISPATCH-505.
    Resolution: Fixed

The underlying problem was that credit was not replenished for unroutable 
deliveries arriving on anonymous links.  The HELLO messages were not the 
problem, but control messages sent to a specific router were occasionally 
unroutable due to in-process topology changes.

> Eventual loss of credit on inter-router control links when the topology 
> changes
> -------------------------------------------------------------------------------
>                 Key: DISPATCH-505
>                 URL: https://issues.apache.org/jira/browse/DISPATCH-505
>             Project: Qpid Dispatch
>          Issue Type: Bug
>          Components: Router Node
>    Affects Versions: 0.6.1
>            Reporter: Ted Ross
>            Assignee: Ted Ross
>            Priority: Critical
>             Fix For: 0.7.0
> It was observed that in a network of routers, connectivity would be lost on 
> some of the inter-router links after a number of days of operation.  When 
> this occurred, the control links displayed a large (and growing) number of 
> undelivered messages outbound as though credit were exhausted on the link.
> Other links remain open and the AMQP heartbeats flow such that the connection 
> is never closed due to inactivity.  This suggests that the problem is 
> isolated to the control links only.
> It is also observed that this problem only occurs when there is expiration of 
> HELLOs causing topology changes.

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