[e-nsp] Summit X450 (no a) - congestion ?

[Marcin Kuczera]

hello,

we have noticed such behavior:
Slot-1 SummitX450-Boguszowice.10 # show ports 1:15 congestion no-refresh
Port Congestion Monitor
Port      Link      Packet
           State     Drop
================================================================================
OLT_AP0-> A         4608666
================================================================================
           Link State: A-Active, R-Ready, NP-Port Not Present L-Loopback
Slot-1 SummitX450-Boguszowice.11 #

Slot-1 SummitX450-Boguszowice.11 # show ports 1:15 configuration no-refresh
Port Configuration
Port     Virtual    Port  Link  Auto   Speed      Duplex   Flow Load   Media
          router     State State Neg  Cfg Actual Cfg Actual Cntrl Master 
Pri Red
================================================================================
OLT_AP0->VR-Default  E      A    ON  AUTO  1000 AUTO FULL NONE       LX
================================================================================
           > indicates Port Display Name truncated past 8 characters
           Link State: A-Active R-Ready NP- Port not present L-Loopback
           Port State: D-Disabled, E-Enabled
           Media: !-Unsupported Optic Module
           Media Red: * - use "show port info detail" for redundant 
media type
Slot-1 SummitX450-Boguszowice.12 #

ExtremeXOS version 12.4.5.3 v1245b3-patch1-6

So - there is no flow control, and we have some dropped packets.

Similar situation on x650
ExtremeXOS version 15.3.1.4 v1531b4-patch1-14

what is the reason for such behavior ? Some buffers get full ?
The only info in documentation I found is: "packets dropped due to 
congestion on a port"

Regards,
Marcin