Preview Tool

Cisco Bug: CSCtd16641 - Tunnel Input queue size is not being decremented

Last Modified

Jan 31, 2017

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)


Input queue on Tunnel interfaces become wedged (size matches or exceeds the max), example:

Tunnel1 is up, line protocol is up 
  Input queue: 2001/2000/0/0 (size/max/drops/flushes); Total output drops: 0

Once this occurs, traffic will not longer pass through this interface.


This issue occurs in IOS versions containing the fix for software defect CSCsy33802 (12.4(25a) and higher).  This will be seen on Tunnel interfaces with traffic shaping applied.
Bug details contain sensitive information and therefore require a 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.