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bbfa235
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On master image, Agent has a list of all DNS publishers in the system as agent subscribes with instances=0. When Agent detects a TCP connection DOWN (as control-node was being upgraded), agent after a few retries will try other DNS Servers in the list. Note at this point the upgraded DNS Servers which may be in the publisher list( as ttl did not expire), may be able to accept TCP connections. These new TCP connections need to be closed if end-of-rib is not computed.