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C-33
Cisco Intrusion Prevention System Sensor CLI Configuration Guide for IPS 7.2
OL-29168-01
Appendix C Troubleshooting
Troubleshooting the Appliance
Sensor Not Seeing Packets
If the sensor is not seeing any packets on the network, you could have the interfaces set up incorrectly.
If the sensor is not seeing packets, follow these steps:
Step 1
Log in to the CLI.
Step 2
Make sure the interfaces are up and receiving packets.
sensor# show interfaces GigabitEthernet0/1
MAC statistics from interface GigabitEthernet0/1
Media Type = backplane
Missed Packet Percentage = 0
Inline Mode = Unpaired
Pair Status = N/A
Link Status = Down
Link Speed = Auto_1000
Link Duplex = Auto_Full
Total Packets Received = 0
Total Bytes Received = 0
Total Multicast Packets Received = 0
Total Broadcast Packets Received = 0
Total Jumbo Packets Received = 0
Total Undersize Packets Received = 0
Total Receive Errors = 0
Total Receive FIFO Overruns = 0
Total Packets Transmitted = 0
Total Bytes Transmitted = 0
Total Multicast Packets Transmitted = 0
Total Broadcast Packets Transmitted = 0
Total Jumbo Packets Transmitted = 0
Total Undersize Packets Transmitted = 0
Total Transmit Errors = 0
Total Transmit FIFO Overruns = 0
sensor#
Step 3
If the interfaces are not up, do the following:
•
Check the cabling.
•
Enable the interface.
sensor# configure terminal
sensor(config)# service interface
sensor(config-int)# physical-interfaces GigabitEthernet0/1
sensor(config-int-phy)# admin-state enabled
sensor(config-int-phy)# show settings
<protected entry>
name: GigabitEthernet0/1
-----------------------------------------------
media-type: tx <protected>
description: <defaulted>
admin-state: enabled default: disabled
duplex: auto <defaulted>
speed: auto <defaulted>
alt-tcp-reset-interface
-----------------------------------------------
none
-----------------------------------------------
-----------------------------------------------
-----------------------------------------------
-----------------------------------------------
sensor(config-int-phy)#