This looks like a bug on the router SSH stack. Try to replicate it running the following command from the command line in order to discard Perl or Net::OpenSSH as the cause of the problem. 
ssh router <<EOC
terminal length 0
terminal width 512
show ip accounting
exit
EOC

[download]

I guess the malfunction is caused by some buffer overflow on the remote shell that is triggered by the longer command line.

In reply to Re^4: Net::OpenSSH multiple commands by salva
in thread Net::OpenSSH multiple commands by mlebel

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