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Cisco Bug: CSCsz32590 - Very big flex-content-filter cannot be inserted

Last Modified

Feb 22, 2014

Products (1)

  • Cisco Guard DDoS Mitigation Appliances

Known Affected Releases

5.1(6) 6.0(10) 6.1(5)

Description (partial)

Symptom:
Flex-content-filter cannot be inserted.
Failure message:
Internal system error during Flex-Content filter configuration
Error adding flex-content-filter

Log messages:
Apr 17 10:47:46 127.1.0.0  IS: Programming Error: regex_filter_preproc was called with (tbl_size < token_size) 
Apr 17 10:47:46 127.1.0.0  IS: Regex preprocessing indicates some error 
Apr 17 10:47:46 127.1.0.0  IS: IOCTL: couldnt register filter 

Sometimes also accelerator card failure may occur after several failures to insert filter because it is too long (causes device reload)

Conditions:
Flex-content-filter is too long. There are many ".*" strings in it. Example (for blade)
flex-content-filter 104 enabled drop 0 0 expression "" pattern "a.*b.*c.*d.*e.*f.*g.*h.*i.*j.*k.*l.*m"
For appliances the failure will occur if the flex-content-filter is longer.
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