I think it's cause you're settingthe error mode too late. Try

$cs = Net::Telnet::Cisco->new(
   Timeout => 3000,
   Host    => $router_IP,
   Errmode => "return",
);

[download]

In reply to Re: net telnet cisco; how to handle unable to connect by ikegami
in thread net telnet cisco; how to handle unable to connect by dhunt

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