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As SLT is performed in the switch CPU, it can affect its performance. Particular precaution should be observed
when activating ACL smart logging, as the traffic size can be significantly high. In such case, monitoring CPU
performance is highly recommended. There are two process names shown in the “show processes cpu” related to
ACL smart logging: “slthandler” is the SLT handler process mentioned earlier, and “HACL queue” is the queue
handler for copy packets generated by the ACL. As an example, in situations where the number of logged packets
is around 100,000 per second, these two processes could consume up to 15 percent and 35 percent of the CPU
time, respectively, bringing the CPU utilization at 90 percent.
Software Update with EEM
EEM can be used to fully automate the service module software update when a version mismatch with Cisco IOS
software occurs. A simple EEM script can detect the service module version mismatch SysLog message and
perform the archive download and the service module reload in sequence. This is very useful when the service
module is moved from a stack to another running a different Cisco IOS Software version, or it replaces an existing
one or finally when a network module is upgraded to a service module.
Software Update with Rolling Stack Upgrade
Rolling stack upgrade is a feature that minimizes the network disruption during Cisco IOS software update for
Layer 2 stacks with redundant uplink modules. Rolling stack upgrade is also available when the stack is equipped
with at least two service modules. Refer to the “Managing Switch Stacks” section in the Cisco Catalyst 3560-X and
3750-X configuration guide for further information.
For More Information
Refer to the following documents:
●
Cisco Catalyst 3560-X 3750-X software configuration guide
●
Cisco Catalyst 3560-X 3750-X hardware installation guide
●
Cisco Flexible NetFlow white paper
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