Cisco Bug: CSCun54469 - Netflow UDP source port is wrong in sh flow exporter
Jul 20, 2018
- Cisco Carrier Routing System
Known Affected Releases
Symptom: UDP source port used to export Netflow packets by the CRS or ASR9K is wrong. For example: RP/0/RP0/CPU0:SFR_CRS-X#sh flow exporter EXPORTER-MPLS location 0/1/cpu0 Tue Mar 4 03:09:56.470 FRANCE Flow Exporter: EXPORTER-MPLS Flow Exporter memory usage: 3280868 Used by flow monitors: MONITOR-MPLS Status: Normal Transport UDP Destination 220.127.116.11 (1337) VRF default Source 18.104.22.168 (63608) << wrong port, correct port is 30968 <snip> Source port displayed by the sh command is wrong and suffers from endian swap: 63608 in hex > 0xF878 30968 in hex > 0x78F8 This can be confirmed with a tcpdump on the collector: User Datagram Protocol, Src Port: 30968 (30968), Dst Port: menandmice-dns (1337) Conditions: Flow exporter map is configured, and on a linecard with a little-endian architecture (e.g. Intel-based).
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