Logstash on virtualbox/docker + cisco

I've started ELK with docker-stack on virtualbox, ports has 514:5044. Pipeline input - udp/5044, output - stdout. Tcpdump catch syslog from cisco - 514/udp. But there is no stdout or index pattern in kibana. Can you help me please?
I can get IP_virtualnox:9200 and IP_virtualbox:5601 - it works well. But I cant see any logs in logstash.

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