ME 2600X input queue drops

[sokarlsson]

We have started to install ME2600X as access switch for FTTH
Trunk ports are configured with rep and service instances
These interfaces are facing Cat 4500X switches with rep edge ports. Northbound is a 6880X VSS and this is connected to the legacy network consisting of a couple of Cat6500 + loads of Catalyst switches

We see loads of input queue drops in ME 2600X on the trunk interfaces. Even if I limit the allowed vlans out from the 4500X to the ME2600X the amount of dropped packets are still about half of the number of packets received on the interface.

Captured traffic going out of the Cat4500X towards the ME 2600X showed mostly what I suspect is REP traffic. "Show mac traffic interface" show that all packers dropped are destined for "RP".

We do not have clients on any ports yet so all traffic are inbound to the switch

I need info and help troubleshooting this. What are the criteria for drops and how do I find what is dropped on this model?
 

[sokarlsson]

Config of REP port except the service instances

interface TenGigabitEthernet0/45
 description TRAMAN-STH-02
 no ip address
 carrier-delay msec 200
 rep segment 1
 no keepalive
 soak link notification 10
 ip dhcp snooping trust
 l2protocol peer cdp lacp
 l2protocol forward stp vtp dtp pagp dot1x

Here is an example of the amount of drops ver input

Switch#show int te0/45
  Input queue: 0/75/337/0 (size/max/drops/flushes); Total output drops: 0
!
  5 minute input rate 59000 bits/sec, 10 packets/sec
!
2659 packets input, 1976424 bytes, 0 no buffer
     Received 745 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input

Switch#show int te0/45 summ

 *: interface is up
 IHQ: pkts in input hold queue     IQD: pkts dropped from input queue
 OHQ: pkts in output hold queue    OQD: pkts dropped from output queue
 RXBS: rx rate (bits/sec)          RXPS: rx rate (pkts/sec)
 TXBS: tx rate (bits/sec)          TXPS: tx rate (pkts/sec)
 TRTL: throttle count

  Interface                   IHQ       IQD       OHQ       OQD      RXBS      RXPS      TXBS      TXPS      TRTL
-----------------------------------------------------------------------------------------------------------------
* Te0/45                        0       533         0         0     64000        16      3000         3         0

switch#show int te0/45 switching
TenGigabitEthernet0/45 TRAMAN-STH-02
          Throttle count          0
                   Drops         RP    5491108         SP          0
             SPD Flushes       Fast          0        SSE          0
             SPD Aggress       Fast          0
            SPD Priority     Inputs          0      Drops          0

    Protocol  CDP
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
                 Process      17267    8029155      19179    7690779
            Cache misses          0          -          -          -
                    Fast          0          0          0          0
               Auton/SSE          0          0          0          0

    Protocol  Other
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
                 Process          0          0    1150382  109509702
            Cache misses          0          -          -          -
                    Fast          0          0          0          0
               Auton/SSE          0          0          0          0

    NOTE: all counts are cumulative and reset only after a reload.