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Cisco Bug: CSCul95231 - IPS: 'show interface' Statistics From Subinterface Sections Incorrect

Last Modified

Jun 15, 2020

Products (17)

  • Cisco IPS 4200 Series Sensors
  • Cisco ASA 5555-X IPS Security Services Processor
  • Cisco IPS 4260 Sensor
  • Cisco IPS 4255 Sensor
  • Cisco IPS 4270-20 Sensor
  • Cisco IPS 4345 Sensor
  • Cisco IPS 4240 Sensor
  • Cisco IPS 4510 Sensor
  • Cisco IPS 4520 Sensor
  • Cisco ASA 5525-X IPS Security Services Processor
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Known Affected Releases

7.1(7)E4 7.1(8)E4

Description (partial)

Symptom:
'show interface' command output's Statistics for Inline VLAN pair sub-interfaces on an IPS sensor device may be incorrect (wrong VLAN IDs, packet/byte counts, etc.) and not reflect reality (how the Inline VLAN pair sub-interface(s) is actually configured). Example:

 sensor# show interface GigabitEthernet0/1
 <truncated>
 Default Vlan = 1
 Inline Mode = Inline-vlan-pair
 <truncated>
 Statistics From Subinterface 1
      Statistics From Vlan 1  <--WRONG VLAN ID
         Total Packets Received On This Vlan = 0  <--INCORRECT COUNTER
         Total Bytes Received On This Vlan = 0  <--INCORRECT COUNTER
         Total Packets Transmitted On This Vlan = 0  <--INCORRECT COUNTER
         Total Bytes Transmitted On This Vlan = 0  <--INCORRECT COUNTER
      Statistics From Vlan 0  <--WRONG VLAN ID
         Total Packets Received On This Vlan = 1110930455
         Total Bytes Received On This Vlan = 529212960930
         Total Packets Transmitted On This Vlan = 1111539327
         Total Bytes Transmitted On This Vlan = 529225380831

 sensor# show config
 <truncated>
 service interface
 physical-interfaces GigabitEthernet0/1 
 admin-state enabled
 default-vlan 1
 subinterface-type inline-vlan-pair
 subinterface 1 
 vlan1 2  <--CORRECT VLAN ID
 vlan2 3  <--CORRECT VLAN ID
 exit
 exit
 exit

Conditions:
IPS sensor device running affected version of software configured with one (1) or more Inline VLAN Pair sub-interfaces (none by-default).
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