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New Member

Me3600X output drops

Hi all,

I have a problem with output drops on an ME3600X (15.3(3)S2). I believe a have too many output drops with no apparent excuse. For example, i have a customer connected on an interface (Full-duplex, 100Mb/s) on which I have applied a hierarchical policy that shapes traffic at 40Mbps and at the same time increases queue-limit at 512000bytes.

The traffic on the interface right now is a low 620Kbps, I reset the counters and in a few minutes I have 59packets dropped. This is just an example.

Is this behaviour normal? Can someone explain to me why on earth it's dropping packets at such a low rate?

One more question: Is the size of the queue shared between all interfaces? What is the suggested way to configure an interface with say 800Mbps of output traffic?

Thank you,
Spiros

interface GigabitEthernet0/8
 description customer
 switchport access vlan xxx
 mtu 9000
 no cdp enable
 no lldp transmit
 service-policy output pmaproot-cust-out

sw#sh policy-map interface gi0/8
 GigabitEthernet0/8

  Service-policy output: pmaproot-cust-out

    Class-map: class-default (match-any)  
      172851 packets, 83280396 bytes
      5 minute offered rate 620000 bps, drop rate 0000 bps
      Match: any

      Service-policy : pmapvlan-cust

        Class-map: class-default (match-any)  
          172851 packets, 83280396 bytes
          5 minute offered rate 620000 bps, drop rate 0000 bps
          Match: any

          Service-policy : pmap-cust-out

            Class-map: class-default (match-any)  
              172851 packets, 83280396 bytes
              5 minute offered rate 620000 bps, drop rate 0000 bps
              Match: any
          Traffic Shaping
            Average Rate Traffic Shaping
            Shape 40000 (kbps)
          Queue-limit 512000 bytes
          Queue-limit current-queue-depth 0 bytes
              Output Queue:
                Default Queue-limit 49152 bytes
                Tail Packets Drop: 59
                Tail Bytes Drop: 88877

 

Everyone's tags (1)
1 REPLY
New Member

Hi,you can try to increase

Hi,

you can try to increase the queue-limit to see if drop rate decreases. There could be (micro)bursts in the flow which exced the buffer size.

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