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Cisco Bug: CSCvv66540 - After upgrade to 17.3.1 As-path-list go missing

Last Modified

Oct 07, 2020

Products (1)

  • Cisco IOS

Known Affected Releases

17.3.1a

Description (partial)

Symptom:
customer upgraded environment from 16.12.4 to 17.3.1a and after that noticed their as-path-lis configuration was not complete, permit/reject action + regex was stripped
prior to upgrade, we had these as-path acl's defined:

ip as-path access-list 10 permit ^$
ip as-path access-list 23 permit _4263120612_
ip as-path access-list 23 permit _65050.3812_
ip as-path access-list 24 permit ^4263120612$
ip as-path access-list 24 permit ^65050.3812$
ip as-path access-list 26 permit _65168_


after upgrade, they go missing:

coc-amus-imdl-a2hx-h1a#sh ip as-path-access-list
coc-amus-imdl-a2hx-h1a#
coc-amus-imdl-a2hx-h1a#
 
sh run output

ip as-path access-list 10
ip as-path access-list 23
ip as-path access-list 24

Conditions:
version 17.3.1a 

as-path configuration + permit/ reject action  + regex 
missing permit/reject action + regex
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