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syslog over TCP with IOS version 15.1

Hello,

Does anyone know where I can find some documents that states clearly how a Cisco router behaves if I'm using syslog over TCP (as opposed to UDP) and the syslog server is down?

 

I know that the default behaviour for a current ASA is to reject any new connection if a TCP syslog server is unavailable, because the assumption is that I'm using TCP to provide reliable audit logging and if it can't write an audit record then it shouldn't permit the connection.  I can change this default on an ASA with  "logging permit-hostdown"

 

However, I am interested in what happens on a Cisco 2901 (currently running IOS 15.1(4)M4), not an ASA

 

I can't find anything in documentation and the logging permit-hostdown command does not exist

 

Thanks

 

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