Cisco Cisco ME 3400EG-2CS-A Switch Release Notes

VLAN Y belongs to the same multicast group, the IP-option traffic received on an input VLAN 
interface other than one in VLAN Y is sent on the trunk port in VLAN Y because the trunk port is 
forwarding in VLAN Y, even though the port has no group membership in VLAN Y. 

There is no workaround. (CSCdz42909)

For trunk ports or access ports configured with IEEE 802.1Q tagging, inconsistent statistics might 
appear in the show interfaces counters privileged EXEC command output. Valid IEEE 802.1Q 
frames of 64 to 66 bytes are correctly forwarded even though the port LED blinks amber, and the 
frames are not counted on the interface statistics. 

There is no workaround. (CSCec35100)

If the number of VLANs times the number of trunk ports exceeds 13,000, the switch can stop. 

The workaround is to not configure more than the recommended number of VLANs and trunks. 
(CSCeb31087)

A CPUHOG message sometimes appears when you configure a private VLAN. Enable port security 
on one or more of the ports affected by the private VLAN configuration.

There is no workaround. (CSCed71422)

When many VLANs are configured on the switch, high CPU utilization occurs when many links are 
flapping at the same time.

The workaround is to remove unnecessary VLANs to reduce CPU utilization when many links are 
flapping. (CSCtl04815)

When you upgrade the switch software to Cisco IOS release 12.2(50)SE or higher and 
autonegotiation is enabled on a Gigabit SFP fiber switch port (the default), but disabled on the link 
partner port, the switch port interface can show a state of down/down while the link partner shows 
up/up. This is expected behavior.

The workaround is to either enable autonegotiation on the link partner port or enter the speed 
nonegotiate interface command on the SFP port.

The following sections provide information about open caveats: