- Non-IP traffic
- Multicast and other non-CEF switching modes
- Asymmetric flows with stateful protocols
- Packets that are originated from or that are destined to the router running NBAR
- Pipelined persistent HTTP requests.
- URL/host/MIME classification with secure HTTP.
- MPLS labelled packets.
- Fragmented packets
- following interfaces:
- Fast EtherChannel
- Interfaces where tunnelling or encryption is used
- ...
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