5-8
Cisco 7401ASR Installation and Configuration Guide
OL-5419-01 B0
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
.
.
.
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
