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Cisco Bug: CSCuc08324 - PPTP or L2TP tunnel can stop working suddenly if MPPE is negotiated

Last Modified

Jul 12, 2021

Products (2)

  • Cisco Catalyst 4000 Software
  • Cisco 2600 Series Multiservice Platforms

Known Affected Releases

15.0(1)M4 15.1(4)M4 15.4(2)T1

Description (partial)

Symptom:
PPTP or L2TP tunnel may suddenly stop passing traffic if MPPE is negotiated. The following error counter is incremented:

show int virtual-access3
...
     91 unknown protocol drops

Conditions:
The following command should present in configuration for MPPE to be negotiated:

interface Virtual-Template4
 ppp encrypt mppe auto
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
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