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Cisco Bug: CSCtc73097 - 4GE-SFP-LC produces incorrect byte subif counts upon roll-over

Last Modified

Jan 09, 2017

Products (1)

  • Cisco 12000 Series Routers

Known Affected Releases

3.6.0.LC 3.6.3.BASE 3.8.1.BASE

Description (partial)


When using a 4GE-SFP-LC card in a c12k router running IOS-XR, byte counts on 802.1Q subinterfaces will be reported incorrectly.

Specifically, after every 68,719,476,735 bytes, a number of 206,158,430,209 bytes are added to the corresponding input/output bytes counter.

As a result, counters seen on "show interface", as well as the input/output rate seen during the interval at which the error occurs, are wrong. Also SNMP will report incorrect data.


This is seen only:
- on a c12k router running IOS-XR
- with 4GE-SFP-LC card
- using 802.1q subinterfaces
- for the input/output byte counter on the subinterface(s) only.
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