14-15
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 14 Configuring MLS
Configuration Guidelines and Restrictions
IP MMLS MSFC Configuration Restrictions
IP MMLS does not perform multilayer switching for an IP multicast flow in these situations:
• For the IP multicast groups that fall into these ranges (where * is in the range 0–255):
224.0.0.* through 239.0.0.*
224.128.0.* through 239.128.0.*
Note The groups in the 224.0.0.* range are reserved for routing the control packets and must be
flooded to all the 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 the IP PIM auto-RP multicast groups (IP multicast group addresses 224.0.1.39 and 224.0.1.40).
Note In the systems with redundant MSFCs, the IP PIM interface configuration must be the same
on both the active and redundant MSFCs.
• For the flows that are forwarded on the multicast-shared tree (that is, {*,G,*} forwarding) when the
interface or group is running IP PIM sparse mode.
• If the shortest-path tree (SPT) bit for the flow is cleared when running IP PIM sparse mode for the
interface or group.
• For the fragmented IP packets and packets with IP options. However, the packets in the flow that are
not fragmented or that do not specify the IP options are multilayer switched.
• For the source traffic that is received on the tunnel interfaces (such as MBONE traffic).
• For any RPF interface with multicast tag switching enabled.
Unsupported IP MMLS Features
If you enable IP MMLS, the IP accounting for the interface will not reflect accurate values.
IPX MLS
These sections describe the configuration guidelines that apply when configuring IPX MLS:
• IPX MLS Interaction with Other Features, page 14-15
• IPX MLS and Maximum Transmission Unit Size, page 14-16
IPX MLS Interaction with Other Features
Other Cisco IOS software features affect IPX MLS as follows:
• IPX accounting—IPX accounting cannot be enabled on an IPX MLS-enabled interface.
• IPX EIGRP—To support MLS on EIGRP interfaces, you must set the Transport Control (TC)
maximum to a value that is greater than the default (16). Enter the ipx maximum-hop tc_value
global configuration command on the MSFC with the tc_value greater than 16.
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