There are drop counters when performance test

[KiCheon.Lee]

Hello,

I am doing performance test with Breaking Point about throughput , CPS.

While testing, I have found drop counters as below.

session_dup_pkt_drop                     701        3 drop      session   resource  Duplicate packet: Applies only for multi-DP plat form with hardware (Tiger) broadcasting pkt to all DPs

What does this mean???

KC Lee

[hshah]

Hi Cheon,

These are genuine packet drops, Firewall DPs drop DUPlicate Packets and it is expected behavior. Normally this happens in multi-DP platform like 5k and 7k.

A Hardware Cheap forwards packet to all DPs', out of all DP only one processes them, and rest drops it. I guess it happens only in the beginning of the session.

Regards,

Hardik Shah

[HULK]

Hello KC,

This is indicating an internal counter, communication between DP-0 to DP-1/DP-2 ( DP-Data-Plane). So, not to worry about it. When dp0 receives the packet and hands off the packet the dp1 asking it to install the session, dp1 starts the packet  processing but during the processing it realizes that this packet must be handled by dp0 and  sends the packet back to dp0. This packet must be sent as a unicast but it is being broadcast  by the tiger chip that handles this packet. When this broadcast is received by the dp0 it drops the  packet since it already has a flow installed and will not accept broadcast.

This happens on on the Multi DP environment (i.e  PA-5000 Platform).

Hope this helps.

Thanks