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ACL Update Process

Can someone please describe what components get updated when you update an ACL. Supposed you have a 4900m and 4 interfaces have the same ACL applied and you add two additional lines like the ones below. Can this cause traffic being sent to those interface to stop for a brief microsecond? I guess what I am looking for is what happens in the background during an ACL update. Does the TCAM get updated? I appreciate any input and feel free to Bash away :-) The reason I ask is because I made an update simlar to the one below it seems to have caused some multicast gaps.

         1040 permit udp any host 100.100.100.132 eq 36987

        1050 permit udp any host 100.100.100.132 eq 36986

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