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Release Notes for the Catalyst 3750 Switch Cisco IOS Release 12.1(14)EA1

OL-4215-01

Limitations and Restrictions

• Layer 2 traceroute to identify the physical path that a packet takes from a source device to a

destination device

For a detailed list of key features for this software release, refer to the Catalyst 3750 Switch Software

Configuration Guide.

Limitations and Restrictions

You should review this section before you begin working with the switch. These are known limitations

that will not be fixed, and there is not always a workaround. Some features might not work as

documented, and some features could be affected by recent changes to the switch hardware or software.

These are the limitations and restrictions:

• “Cisco IOS Limitations and Restrictions” section on page 15

• “Cluster Limitations and Restrictions” section on page 18

• “CMS Limitations and Restrictions” section on page 19

Cisco IOS Limitations and Restrictions

These limitations apply to Cisco IOS configuration:

• Non-reverse-path forwarded (RPF) IP multicast traffic to a group that is bridged in a VLAN is leaked

onto a trunk port in the VLAN even if the port is not a member of the group in the VLAN, but it is

a member of the group in some other VLAN. Because unnecessary traffic is sent on the trunk port,

it needlessly reduces the bandwidth of the port. There is no workaround for this problem because

non-RPF traffic is continuous in certain topologies. As long as the trunk port is a member on a trunk

port in at least one VLAN, this problem for the non-RPF traffic occurs. (CSCdu25219)

• If a bridge group contains a VLAN that has a static MAC address configured, all non-IP traffic in

the bridge group with this MAC address destination is sent to all ports in the bridge group. The

workaround is to remove the VLAN from the bridge group or to remove the static MAC address from

the VLAN. (CSCdw81955)

• If the number of multicast routes and Internet Group Management Protocol (IGMP) groups are more

than the maximum number specified with the show sdm prefer global configuration command, the

traffic received on unknown groups is flooded in the received VLAN even though the show ip igmp

snooping multicast-table privileged EXEC command output shows otherwise. The workaround is

to reduce the number of multicast routes and IGMP snooping groups to less than the maximum

supported value. (CSCdy09008)

• An egress SPAN copy of routed unicast traffic might show an incorrect destination MAC address on

both local and remote SPAN sessions. This limitation does not apply to bridged packets. The

workaround for local SPAN is to use the replicate option. For a remote SPAN session, there is no

workaround. This is a hardware limitation. (CSCdy72835)

• Egress SPAN routed packets (both unicast and multicast) show the incorrect source MAC address.

For remote SPAN packets, the source MAC address should be the MAC address of the egress VLAN,

but instead the packet shows the MAC address of the remote SPAN (RSPAN) VLAN. For local

SPAN packets with native encapsulation on the destination port, the packet shows the MAC address

of VLAN 1. This problem does not appear with local SPAN when the encapsulation replicate option

is used. This limitation does not apply to bridged packets. The workaround is to use the encapsulate

replicate keywords in the monitor session global configuration command. Otherwise, there is no

workaround. This is a hardware limitation. (CSCdy81521)

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