Multilink traffic stats on IOS 15.x versions

[boltons]

Multilink input rate registers double the conbined rate of the 2 T1 interfaces.  Seen on 15.1 and 15.3 code so far.  Is this a known bug?  Unable to locate a possiable associated bug#.

a.) Traffic rate is also showing on SNMP applications such as Solarwinds Bandwidth monitor.

b.) Multilink Output rate does agree with combined serial output rates.

FYI

Below is an example of the Mu1 input rate for a 3M link whick reports it is running at almost double its physical capacity.

5 minute input rate 5453000 bits/sec, 1134 packets/sec

controller T1 0/0/0

cablelength long 0db

channel-group 0 timeslots 1-24

controller T1 0/0/1

cablelength long 0db

channel-group 0 timeslots 1-24

<removed>#sh ppp all

Interface/ID OPEN+ Nego* Fail-     Stage    Peer Address    Peer Name

------------ --------------------- -------- --------------- --------------------

Mu1          IPCP+ CDPCP-          LocalT   <removed>                

Se0/0/0:0    LCP+                  LocalT   <removed>

Se0/0/1:0    LCP+                  LocalT   <removed>

[CSCO11927595]

Hello,

I have the same issue : my traffic is double in the multilink on input compare to the serial interface. Do you found some information about this issue ?

IOS Version 15.2(4)S3

Cisco 7206VXR

Thanks

[boltons]

No.  I have found note regarding bug CSCtz48125 in which the multilink input was reporting half that of the physical ports. It would appear that the code correction may have been applied incorreclty to both input and output of code sections and now the multilink output is double that of the physical ports.  I have not had the opportunity to open a tac on the issue.

[boltons]

There is no CCO IOS present for this bug in 15.2(4)M. It will be available in and above 15.2(4)M4. 
 
Fixed-In Description: Fixed-in
15.3(2.14)S
15.3(2.7)T
15.2(4)M3.4
15.3(1)S1.6
15.2(1.2.3)PI22
15.3(2.8.1)PIB23
15.3(2.15.1)XEB
15.3(2.9)T

[Andrew Chapman]

I experienced the same issue running 15.2(4) and TAC identified bug ID CSCue27379.

Hope this helps,

Andrew