Release Notes for Cisco Catalyst Blade Switch 3120 for HP, Cisco IOS Release 12.2(52)SE

OL-19714-01

Limitations and Restrictions

Configuration

• If a half-duplex port running at 10 Mb/s receives frames with Inter-Packet Gap (IPG) that do not

conform to Ethernet specifications, the switch might stop sending packets.

There is no workaround. (CSCec74610)

• When an excessive number (more than 100 packets per second) of Address Resolution Protocol

(ARP) packets are sent to a Network Admission Control (NAC) Layer 2 IP-configured member port,

a switch might display a message similar to this:

PLATFORM_RPC-3-MSG_THROTTLED: RPC Msg Dropped by throttle mechanism: type 0, class

51, max_msg 128, total throttled 984323

-Traceback= 6625EC 5DB4C0 5DAA98 55CA80 A2F2E0 A268D8

No workaround is necessary. Under normal conditions, the switch generates this notification when

snooping the next ARP packet. (CSCse47548)

• When there is a VLAN with protected ports configured in fallback bridge group, packets might not

be forwarded between the protected ports.

The workaround is to not configure VLANs with protected ports as part of a fallback bridge group.

(CSCsg40322)

When a switch port configuration is set at 10 Mb/s half duplex, sometimes the port does not send in

one direction until the port traffic is stopped and then restarted. You can detect the condition by

using the show controller ethernet-controller or the show interfaces privileged EXEC commands.

The workaround is to stop the traffic in the direction in which it is not being forwarded, and then

restart it after 2 seconds. You can also use the shutdown interface configuration command followed

by the no shutdown command on the interface. (CSCsh04301)

• When line rate traffic is passing through a dynamic port, and you enter the switchport access vlan

dynamic interface configuration command for a range of ports, the VLANs might not be assigned

correctly. One or more VLANs with a null ID appears in the MAC address table instead.

The workaround is to enter the switchport access vlan dynamic interface configuration command

separately on each port.(CSCsi26392)

EtherChannel

• In an EtherChannel running Link Aggregation Control Protocol (LACP), the ports might be put in

the suspended or error-disabled state after a stack partitions or a member switch reloads. This occurs

when

–

The EtherChannel is a cross-stack EtherChannel with a switch stack at one or both ends.

–

The switch stack partitions because a member reloads. The EtherChannel is divided between the

two partitioned stacks, each with a stack master.

The EtherChannel ports are put in the suspended state because each partitioned stack sends LACP

packets with different LACP Link Aggregation IDs (the system IDs are different). The ports that

receive the packets detect the incompatibility and shut down some of the ports. Use one of these

workarounds for ports in this error-disabled state:

–

Enable the switch to recover from the error-disabled state.

–

Enter the shutdown and the no shutdown interface configuration commands to enable the port.