Release Notes for Cisco Catalyst Blade Switch 3120 for HP, Cisco IOS Release 12.2(46)SE

OL-16968-01

Limitations and Restrictions

SPAN and RSPAN

These are the SPAN and Remote SPAN (RSPAN) limitations.

• When egress SPAN is running on a 10-Gigabit Ethernet port, only about 12 percent of the egress

traffic is monitored.

There is no workaround. This is a hardware limitation. (CSCei10129)

• When the logging event-spanning-tree interface configuration command is configured and logging

to the console is enabled, a topology change might generate a large number of logging messages,

causing high CPU utilization. CPU utilization can increase with the number of spanning-tree

instances and the number of interfaces configured with the logging event-spanning-tree interface

configuration command. This condition adversely affects how the switch operates and could cause

problems such as STP convergence delay.

High CPU utilization can also occur with other conditions, such as when debug messages are logged

at a high rate to the console.

Use one of these workarounds (CSCsg91027):

–

Disable logging to the console.

–

Rate-limit logging messages to the console.

–

Remove the logging event spanning-tree interface configuration command from the interfaces.

• The far-end fault optional facility is not supported on the GLC-GE-100FX SFP module.

The workaround is to configure aggressive UDLD. (CSCsh70244).

VLANs

This is a VLAN limitation:

When the domain is authorized in the guest VLAN on a member switch port without link loss and an

Extensible Authentication Protocol over LAN (EAPOL) is sent to an IEEE 802.1x supplicant to

authenticate, the authentication fails. This problem happens intermittently with certain stacking

configurations and only occurs on the member switches.

The workaround is to enter the shut and no shut interface configuration commands on the port to reset

the authentication status. (CSCsf98557)

Stacking

These are the switch stack limitations:

• When using the logging console global configuration command, low-level messages appear on both

the stack master and the stack member consoles.

The workaround is to use the logging monitor global configuration command to set the severity

level to block the low-level messages on the stack member consoles. (CSCsd79037)

• If a new member switch joins a switch stack within 30 seconds of a command to copy the switch

configuration to the running configuration of the stack master, the new member might not get the

latest running configuration and might not operate properly.

The workaround is to reboot the new member switch. Use the remote command all show run

privileged EXEC command to compare the running configurations of the stack members.

(CSCsf31301)