[c-nsp] Strange drops on 6500

[Church, Chuck]

You should be glad you getting any frames over dark fiber :)  Seriously
though, is it possible these are just errors in the output (a bug)?
Reason I'm asking is the drops are almost even between the two
interfaces even though the first interface is seeing 10x the traffic.
And the 'last input' counter is showing 2 years and 7 weeks ago...  I
assume the channel was negotiated correctly, right?


Chuck Church
Lead Design Engineer
CCIE #8776, MCNE, MCSE
Netco Government Services - Design & Implementation
1210 N. Parker Rd.
Greenville, SC 29609
Home office: 864-335-9473
Cell: 703-819-3495
cchurch at netcogov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4371A48D


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Tantsura, Jeff
Sent: Friday, September 23, 2005 4:15 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Strange drops on 6500

Hi,

I've got following problem:
There are 2 6500 Sup1a 12.1(8a)EX connected by 2 dark fibers on 2
different
blades.
There's about 20Mb/5000 pps on every link (bound as etherchannel)
Both links drop about 20-30 pps in outgoing direction.
Please find the configuration below.
Thanks in advance,
Jeff

interface GigabitEthernet1/1
  mtu 1508
 no ip address
 mls qos trust ip-precedence
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 20,25,30,901,903,959-966,1002-1005
 switchport mode trunk
 channel-group 1 mode desirable

interface GigabitEthernet2/1
 mtu 1508
 no ip address
 mls qos trust ip-precedence
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 20,25,30,901,903,959-966,1002-1005
 switchport mode trunk
 channel-group 1 mode desirable

interface Port-channel1
 mtu 1508
 no ip address
 mls qos trust ip-precedence
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 20,25,30,901,903,959-966,1002-1005
 switchport mode trunk
 spanning-tree vlan 901 cost 65535
 spanning-tree vlan 903 cost 65535
 spanning-tree vlan 959 cost 65535
 spanning-tree vlan 962 cost 65535
 spanning-tree vlan 963 cost 65535
 spanning-tree vlan 966 cost 65535
 spanning-tree cost 3


GigabitEthernet1/1 is up, line protocol is up 
  Hardware is C6k 1000Mb 802.3, address is 0005.5f2c.be70 (bia
0005.5f2c.be70)
  MTU 1508 bytes, BW 1000000 Kbit, DLY 10 usec, 
     reliability 255/255, txload 5/255, rxload 5/255
  Encapsulation ARPA, loopback not set
  Full-duplex, 1000Mb/s
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 2y7w, output 2y7w, output hang never
  Last clearing of "show interface" counters 17:26:57
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops:
475088
  Queueing strategy: fifo
  Output queue :0/40 (size/max)
  5 minute input rate 20063000 bits/sec, 5400 packets/sec
  5 minute output rate 22552000 bits/sec, 5229 packets/sec
     390754099 packets input, 203856992684 bytes, 0 no buffer
     Received 533410 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     369139897 packets output, 184429171061 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

Hardware is C6k 1000Mb 802.3, address is 0005.5f2c.bea8 (bia
0005.5f2c.bea8)
  Description: FR-CHP-SA-04 GE.2.2 CHAMPAGNE 1GBITS ZX
  MTU 1508 bytes, BW 1000000 Kbit, DLY 10 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Full-duplex, 1000Mb/s
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 2y7w, output 2y7w, output hang never
  Last clearing of "show interface" counters 17:27:10
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops:
475186
  Queueing strategy: fifo
  Output queue :0/40 (size/max)
  5 minute input rate 2729000 bits/sec, 527 packets/sec
  5 minute output rate 2398000 bits/sec, 490 packets/sec
     15908082 packets input, 6661511961 bytes, 0 no buffer
     Received 1601550 broadcasts, 0 runts, 0 giants, 0 throttles
     50 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     14086196 packets output, 4473718198 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out



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