Cisco Cisco IOS Software Release 15.0(1)SE

If the number of VLANs times the number of trunk ports exceeds the recommended limit of 13,000, 
the switch can fail. 

The workaround is to reduce the number of VLANs or trunks. (CSCeb31087)

When dynamic ARP inspection is configured on a VLAN, and the ARP traffic on a port in the VLAN 
is within the configured rate limit, the port might go into an error-disabled state. 

The workaround is to configure the burst interval to more than 1 second. (CSCse06827)

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 are prompted to accept the security certificate and you click No, you only see a blank 
screen, and the device manager does not start. 

The workaround is to click Yes when you are prompted to accept the certificate. (CSCef45718)

The behavior of the no logging on global configuration command changed in Cisco IOS 
Release 12.2(18)SE and later. You can only use the logging on and then the no logging console 
global configuration commands to disable logging to the console. (CSCec71490)

In Cisco IOS Release 12.2(25)SEC, the implementation for multiple spanning tree (MST) changed 
from the previous release. Multiple STP (MSTP) complies with the IEEE 802.1s standard. Previous 
MSTP implementations were based on a draft of the IEEE 802.1s standard.

If the switch requests information from the Cisco Secure Access Control Server (ACS) and the 
message exchange times out because the server does not respond, a message similar to this appears:

00:02:57: %RADIUS-4-RADIUS_DEAD: RADIUS server 172.20.246.206:1645,1646 is not 

responding.

If this message appears, make sure that there is network connectivity between the switch and the 
ACS. You should also make sure that the switch has been properly configured as an AAA client on 
the ACS.