不支持硬件交换的数据类型 - 思科交换

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Software Switching

Software switching occurs when traffic cannot be processed in hardware. The following types of exception packets are processed in software at a much slower rate:

Packets that use IP header options

Note Packets that use TCP header options are switched in hardware because they do not affect the forwarding decision.

Packets that have an expiring IP time-to-live (TTL) counter
Packets that are forwarded to a tunnel interface
Packets that arrive with non-supported encapsulation types
Packets that are routed to an interface with non-supported encapsulation types
Packets that exceed the MTU of an output interface and must be fragmented
Packets that require an IGMP redirect to be routed
802.3 Ethernet packets