Cisco Systems EA6500 Manual De Usuario

These sections describe IP Multicast Layer 3 switching configuration restrictions:

In systems with PCF2 and MSFC2, IP multicast Layer 3 switching is not provided for an IP multicast 
flow in the following situations:

For IP multicast groups that fall into the range 224.0.0.* (where * is in the range 0 to 255), which 
is used by routing protocols. Layer 3 switching is supported for groups 225.0.0.* through 239.0.0.* 
and 224.128.0.* through 239.128.0.*.

Groups in the 224.0.0.* range are reserved for routing control packets and must be flooded 
to all forwarding ports of the VLAN. These addresses map to the multicast MAC address 
range 01-00-5E-00-00-xx, where xx is in the range 0–0xFF.

For PIM auto-RP multicast groups (IP multicast group addresses 224.0.1.39 and 224.0.1.40).

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

For packets with IP options. However, packets in the flow that do not specify IP options are hardware 
switched.

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

In systems with PFC1 and MSFC or MSFC2, IP multicast Layer 3 switching is not provided for an IP 
multicast flow in the following situations:

For IP multicast groups that fall into these ranges (where * is in the range 0 to 255):

224.0.0.* through 239.0.0.*

 

224.128.0.* through 239.128.0.*

Groups in the 224.0.0.* range are reserved for routing control packets and must be flooded 
to all forwarding interfaces of the VLAN. All these addresses map to the multicast MAC 
address range 01-00-5E-00-00-xx, where xx is in the range 0–0xFF.

For PIM auto-RP multicast groups (IP multicast group addresses 224.0.1.39 and 224.0.1.40). 

For flows that are forwarded on the multicast-shared tree (that is, {*,G,*} forwarding) when the 
interface or group is running PIM sparse mode.