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Cisco Bug: CSCuj20873 - IOS-XE - Default Flow Monitor Cache Size is Too Big, Causing "QFP_FNF-4-FNF_MEM_UPLIMIT_WARN" Errors

Last Modified

Nov 20, 2018

Products (1)

  • Cisco Cloud Services Router 1000V Series

Known Affected Releases


Description (partial)

The default flow monitor cache size for IOS-XE routers is 200,000 entries. For example:

ROUTER#sh run flow monitor
Current configuration:
flow monitor test
 exporter cisco-pi-v9
 record transaction-record

ROUTER#sh flow monitor test
Flow Monitor test:
  Description:       User defined
  Flow Record:       transaction-record
  Flow Exporter:     cisco-pi-v9 (inactive)
    Type:                 normal (Platform cache)
    Status:               not allocated
    Size:                 200000 entries
    Inactive Timeout:     15 secs
    Active Timeout:       1800 secs
    Update Timeout:       1800 secs
    Synchronized Timeout: 600 secs
    Trans end aging:   off

When multiple large flow records are in use, applying flow monitor to interface could result in the following error:

%QFP_FNF-4-FNF_MEM_UPLIMIT_WARN: F0: cpp_cp:  Netflow and Flexible Netflow configuration is using (76095076) bytes of data plane DRAM which exceeds the recommended maximum of (67108864) bytes.

In addition, the router could crash due to memory exhaustion. This can be seen on IOS-XE routers including the ASR 1K and CSR 1000v. The default cache size may need to be lowered in later versions of code.

1) Netflow monitor cache size is 200k entries
2) Using multiple flow monitors
3) Getting close to or exceeding the flow monitor cache size
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