Cisco WS-X6066-SLB-APC - Content Switching Module - Ipx Mls

14-13
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
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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 the following situations:
• For 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 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 IP PIM auto-RP multicast groups (IP multicast group addresses 224.0.1.39 and 224.0.1.40).
Note In systems with redundant MSFCs, the IP PIM interface configuration must be the same
on both the active and redundant MSFCs.
• For 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 fragmented IP packets and packets with IP options. However, packets in the flow that are not
fragmented or that do not specify IP options are multilayer switched.
• For source traffic received on tunnel interfaces (such as MBONE traffic).
• For any RPF interface with multicast tag switching enabled.
Unsupported IP MMLS Features
If you enable IP MMLS, IP accounting for the interface will not reflect accurate values.
IPX MLS
These sections describe configuration guidelines that apply when configuring IPX MLS:
• IPX MLS Interaction with Other Features, page 14-13
• IPX MLS and Maximum Transmission Unit Size, page 14-14
IPX MLS Interaction with Other Features
Other 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 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.