Guest

Preview Tool

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

Last Modified

Apr 17, 2019

Products (138)

  • Cisco IOS
  • Cisco 861W Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco 1812 Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco 1803 Integrated Services Router
  • Cisco 878 Integrated Services Router
  • Cisco AS5400XM Universal Gateway
  • Cisco 881SRSTW Integrated Services Router
  • Cisco 2951 Integrated Services Router
View all products in Bug Search Tool Login Required

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
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.