Cisco Bug: CSCtd37043 - N7K: UDP port 0 should not not be allowed for netflow exporter
Feb 08, 2017
- Cisco Nexus 7000 Series Switches
Known Affected Releases
Symptom: The CLI allows configuration of UDP port 0 as destination port: n7k-1# conf t Enter configuration commands, one per line. End with CNTL/Z. n7k-1(config)# feature netflow n7k-1(config)# 2009 Nov 20 14:20:38.109 n7k-1 %NFM-5-FEATURE_ENABLED: NetFlow Enabled. n7k-1(config)# flow exporter test n7k-1(config-flow-exporter)# transport udp ? <0-65535> Destination UDP Port n7k-1(config-flow-exporter)# transport udp 0 n7k-1(config-flow-exporter)# UDP port 0 is an invalid port; when the flow exporter is configured with UDP port 0, no netflow record is sent to the collector. Ideally, UDP port 1 - 1024 should be avoided as well, if possible. Conditions: Configuring network exporter.
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