[c-nsp] Strange drops on 6500

[Tantsura, Jeff]

Hi Tim,

That's great I can discuss this problem with you.

There's a chain of Cat6000
1    2  Cat 6k sup 1 Enhanced QoS (Active)     WS-X6K-SUP1A-2GE   
2    2  Cat 6k sup 1 Enhanced QoS (Standby)    WS-X6K-SUP1A-2GE   
3    8  8 port 1000mb GBIC Enhanced QoS        WS-X6408A-GBIC     

running 12.1(8a)EX and connected by longhaul fibers. There's about 30 Mb of
traffic on these links
All of these switches show strange stuff in output of various show command.
All switches show outgoing drops on some interfaces, which are about 50 pps
irrelevant of amount of traffic, some interfaces don't show any drops
Some switches show CRC errors, some switches show overruns (but not CRC)
One of the switches show drop in priority queue:

sh queueing interface gi1/1
Packets dropped on Transmit:
    BPDU packets:  0

    queue thresh    dropped  [cos-map]
    ---------------------------------------------------
    1     1               0  [0 1 ]
    1     2               0  [2 ]
    2     1            1509  [4 6 ]
    2     2             661* [7 ]
    3     1             661* [3 5 ]
                                  * - shared transmit counter

  Packets dropped on Receive:
    BPDU packets:  182

    queue thresh    dropped  [cos-map]
    ---------------------------------------------------
    1     1        24162241  [0 1 ]
    1     2           32242  [2 ]
    1     3           79546  [4 6 ]
    1     4           98246* [7 ]
    2     1           98246* [3 5 ]
                                  * - shared receive counter


Any advice would be highly appreciated.
Thanks in advance,

Jeff 



--
Jeff Tantsura  CCIE# 11416
Senior IP Network Engineer


-----Original Message-----
From: Tim Stevenson [mailto:tstevens at cisco.com] 
Sent: 27 September 2005 02:02
To: Virgil; Tantsura, Jeff; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Strange drops on 6500

Missed the rest of this thread, but pruning VLAN 1 does not impact 
BPDU transmission, it just prevents data traffic from passing over 
the trunk in VLAN 1.

Tim

At 09:14 AM 9/26/2005, Virgil pronounced:
>On 23/9/05 6:15 PM, "Tantsura, Jeff" <jtantsura at upcbroadband.com> wrote:
>
> > switchport trunk allowed vlan 20,25,30,901,903,959-966,1002-1005
>
>
>Try adding vlan 1 to this list.  Your 'dropped' packets are probably BPDUs
>and other such "native vlan" traffic.
>
>
>Regards
>Virgil
>
>--
>virgil at webcentral.com.au
>
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
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