Cisco Systems 7401ASR PXF Troubleshooting Information, Cisco IOS Statistics Not Supported by PXF

Chapter 5 Troubleshooting

PXF Troubleshooting Information

PXF Troubleshooting Information

Note The VPN Acceleration Module (VAM) is not compatible with the PXF processor.

Cisco IOS Statistics Not Supported by PXF

Some standard Cisco IOS statistics are not supported in the PXF path, including:

•Subinterface counters

•ATM VC counters

•Class-match statistics on classes with neither policing nor class-based weighted fair queueing (CBWFQ)

Features Not Supported by PXF

Features that are not supported by PXF are punted to the Route Processor (RP), which can cause high RP CPU usage.

High PXF CPU Usage

Enter the show pxf accounting summary command to display information about PXF CPU usage:

Router# show pxf accounting summary

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10 second averages: PXF complex busy: 1% PXF read pipeline full: 0%

The PXF has 16 processors, only one of which is in use at a time when there is a low traffic rate. Even though only one of the processors is working, all of the PXF processors are slightly slowed. At higher traffic rates, many of the PXF processors are working at the same time, but there is no additional slow down.

High Route Processor CPU Usage

High RP CPU usage may result from punting of packets from the PXF processors to the RP. Enter the show pxf accounting summary command to view the number and cause of punts.

Router# show pxf accounting summary

		Pkts	Dropped		RP Processed	Ignored
			Total		0	48360	0
		PXF Statistic:
		Packets	RP -> PXF:
		switch ip:			0
		switch raw:			30048360
		qos	fastsend:		0
		qos	enqueue:		1938
		Total:			30050298
		Packets	PXF ->	RP:
		qos	pkts:		1938
		fast pkts:			30000000
		drops:total			0
		punts:total			48360
"			not	IP	:	40572
"			CEF	no adjacency :		7788
		Total:			30050298
		Cisco 7401ASR Installation and Configuration Guide
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