04-27-2010 10:13 PM - edited 03-06-2019 10:50 AM
Hi,
We have cisco 3750 switch high cpu due to interrupt and TCAM utilization is full on ASICs because of unicast.
Please guide what is cause interrupt because traffic. If it is traffic how to measure in Mpps in cisco 3750 switch
04-27-2010 10:21 PM
Hi,
We have cisco 3750 switch high cpu due to interrupt and TCAM utilization is full on ASICs because of unicast.
Please guide what is cause interrupt because traffic. If it is traffic how to measure in Mpps in cisco 3750 switch
Hi,
When the interrupt percentage is high, the root cause of the problem is that the CPU is receiving too many packets. To resolve the problem, you need to find the source of the packets, and either stop the flow, or modify the switch configuration.
Check out the below link for analyzing the network traffic to overcome the interrupt issue.
Hope to Help !!
Ganesh.H
05-01-2010 12:05 AM
Thanks Ganesh.
I have read the document. We captured sniffer of packet but could not find the source of traffic. Is there any command or solution to capture high utilized MAC address.
It is noticed that all zero mac address flooding in the network.
05-01-2010 12:20 AM
all zero mac? well it doesnt sound logical. so i looked for it.I dont think that should happen often.
The switch filter frames with a source MAC address of 00-00-00-00-00-00, which is an invalid source MAC, from the CAM table. This is an example of the syslog error output when this occurs:
%SYS-4-P2_WARN: 1/Filtering MAC address 00-00-00-00-00-00 on port 2/48 from host table
These messages are informational and tell you that a frame that has a source MAC address of 00-00-00-00-00-00 is found, and the switch will never add that to the CAM table. However, the switch will forward traffic sourced from an all-zero MAC address.
The workaround is to identify the end station that generates frames with an all-zero source MAC address. Typically, one of these devices transmits such frames:
A traffic generator, such as Spirent SmartBits
Certain types of servers, such as load-balancing IBM WebSphere servers
A misconfigured router or end station, such as a device that transmits all-zeros broadcasts
A faulty NIC
http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a00807347ab.shtml
05-01-2010 08:29 AM
Thanks Ganesh.
I have read the document. We captured sniffer of packet but could not find the source of traffic. Is there any command or solution to capture high utilized MAC address.
It is noticed that all zero mac address flooding in the network.
Hi,
Actually with etheral capture you should able to see the source and destination of the packets, anyway try with command show interfaces statistics detail for fast ethernet details it will help you to find the Traffic statistics: per ports with input and output packets bps.
and as suggested check out the link for all zero mac-address problem.
http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a00807347ab.shtml#zero
Hope to Help !!
Ganesh.H
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