It does not need "clear bgp ... " sometimes in ASR9K

[wfqk]

Hi As we know, if bgp policy changed, we need to use command to clear it as the below command. But sometimes I found people do not use the command. Can you tell in what situation, we do not need to use the clear command? 

clear bgp ipv4 unicast 6.4.8.13 soft

For example: 

the original config has:

as-path-set FILTER
ios-regex '_1_'

When I add the below one more ios-regex, do you think we need bgp clear command? Thank you

ios-regex '_12_'

[paul driver]

Hello
Soft reset is applicable to a route policy change you make - Most uptodate IOS now support this by default instead of having to enable the older more resource intensive neighbor x.x.x soft-reconfiguration inbound

Some options:
clear ip bgp * soft  in/out
clear ip bgp *<peer> soft  in/out
clear ip bgp ipv4 unicast <asn> soft in/out

res
Paul