I read that there is a possiblity to filter packets according to packet-length. Has anybody been able to use this feature? Is it just for specific protocols? I have tried it in various contexts but have not been successful so far.
I haven't heard of that capability with regards to straight ACLs. You can capture so many bytes with regards to SPAN which can be used from an ACL. It's referred to as partial packet mirroring. Maybe that is what you are referring to?
RP/0/RP0/CPU0:ASR9922-A(config)#ipv4 access-list blah permit ipv4 any any ?
capture Capture matched packet
default Use specified default nexthop on match against this entry
dscp Match packets with given DSCP value(s)
fragments Check non-initial fragments
log Log matches against this entry
log-input Log matches against this entry, including input interface
nexthop1 Forward to specified nexthop on match against this entry
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