Cisco Systems EA6500 Manual De Usuario

If the SPT bit for the flow is cleared when running PIM sparse mode for the interface or group.

For packets that require fragmentation and packets with IP options. However, packets in the flow 
that do not specify IP options are Layer 3 switched.

For source traffic received on tunnel interfaces (such as MBONE traffic).

Input ACL deny is not applied by the hardware ACL engine when the Layer 2 entry corresponding to the 
Layer 3 flow does not exist in the Layer 2 forwarding table. The ACL will be applied by the MSFC 
software.

If you enable IP multicast Layer 3 switching, IP accounting for Layer 3 interfaces does not report 
accurate values. The show ip accounting command is not supported.

These sections describe how to configure IP multicast Layer 3 switching:

With Release 12.1(11b)E and later, when you are in configuration mode you can enter EXEC mode-level 
commands by entering the do keyword before the EXEC mode-level command.