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In ACI - Interfaces in vPC or PC load share the traffic ? How it works

Hi Experts , 

 

We are facing an communication issue during replication(backup) between 2 servers SERVER-01 and SERVER-02 .

SERVER-01 is a production server and SERVER02 is backup server . May be during the backup the communication fails .

 

We had CRC errors/input errors on the Switch side . After reseating the Fiber cable and SFP ports , We are not observing any CRC error . But the initial issue reported by server team is till there . 

 

on the switch interface within vpc only one interface has input traffic and on other interface the input rate is 0 . So when we checked the graph in solarwinds ,We observed that during the backup  (time 02:15 CET to 02:30 CET) , the receive traffic on eth1/14 LEAF101 switch has 101GB of Bytes received but on LEAF102 it's just 5KB of received Bytes ... 

 

On other side transferred Bytes on LEAF205 eth1/22 interface is 95 MB and  transferred Bytes on LEAF206 eth1/22 interface is 107Gb ..?

 

when the traffic reaches POD-2 why it is not load shared between LEAF205 and LEAF206 ? Is there any issue here or it is how the port-channel or Vpc interfaces should work ???

 

Avi vPC2.PNG

 

 

2 Replies 2

Robert Burns
Cisco Employee
Cisco Employee

This sounds like a similar question to the other you posted.  If so, please continue with that thread so we're not duplicating efforts: https://community.cisco.com/t5/application-centric/only-one-vpc-interface-is-used-for-communication/m-p/4607660#M12263

Robert

DONE.

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