At 10:56 05/01/2011 +0100, Peter Rathlev wrote:
Do you have QoS enabled? What does "show queueing interface Gi9/29" tell
you?
Output drops are "egress buffer overflow" drops, so technically it
happens because the box tries to send a packet out an interface already
in use (transmitting another packet) when there is no buffer space to
store the packet until transmission. Micro-bursts and oversubscription
are possible causes. Short queues exacerbate the problem. With "mls qos"
enabled and no interface-specific adjustments you could have (too) short
queues for the relevant traffic.
gp#show queueing interface Gi9/29
Interface GigabitEthernet9/29 queueing strategy: Weighted Round-Robin
Port QoS is enabled
Port is untrusted
Extend trust state: not trusted [COS = 0]
Default COS is 0
Queueing Mode In Tx direction: mode-cos
Transmit queues [type = 1p3q8t]:
Queue Id Scheduling Num of thresholds
-----------------------------------------
01 WRR 08
02 WRR 08
03 WRR 08
04 Priority 01
WRR bandwidth ratios: 100[queue 1] 150[queue 2] 200[queue 3]
queue-limit ratios: 50[queue 1] 20[queue 2] 15[queue 3] 15[Pri
Queue]
queue tail-drop-thresholds
--------------------------
1 70[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]
2 70[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]
3 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]
queue random-detect-min-thresholds
----------------------------------
1 40[1] 70[2] 70[3] 70[4] 70[5] 70[6] 70[7] 70[8]
2 40[1] 70[2] 70[3] 70[4] 70[5] 70[6] 70[7] 70[8]
3 70[1] 70[2] 70[3] 70[4] 70[5] 70[6] 70[7] 70[8]
queue random-detect-max-thresholds
----------------------------------
1 70[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]
2 70[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]
3 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]
WRED disabled queues:
queue thresh cos-map
---------------------------------------
1 1 0
1 2 1
1 3
1 4
1 5
1 6
1 7
1 8
2 1 2
2 2 3 4
2 3
2 4
2 5
2 6
2 7
2 8
3 1 6 7
3 2
3 3
3 4
3 5
3 6
3 7
3 8
4 1 5
Queueing Mode In Rx direction: mode-cos
Receive queues [type = 2q8t]:
Queue Id Scheduling Num of thresholds
-----------------------------------------
01 WRR 08
02 WRR 08
WRR bandwidth ratios: 100[queue 1] 0[queue 2]
queue-limit ratios: 100[queue 1] 0[queue 2]
queue tail-drop-thresholds
--------------------------
1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]
2 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]
queue thresh cos-map
---------------------------------------
1 1 0 1 2 3 4 5 6 7
1 2
1 3
1 4
1 5
1 6
1 7
1 8
2 1
2 2
2 3
2 4
2 5
2 6
2 7
2 8
Packets dropped on Transmit:
queue dropped [cos-map]
---------------------------------------------
1 1590686 [0 1 ]
2 250 [2 3 4 ]
3 0 [6 7 ]
4 0 [5 ]
Packets dropped on Receive:
BPDU packets: 0
queue dropped [cos-map]
---------------------------------------------
1 0 [0 1 2 3 4 5 6 7 ]
2 0 []
For mls:
sh conf | incl mls
mls ip multicast flow-stat-timer 9
mls ip multicast bidir gm-scan-interval 10
mls flow ip interface-full
no mls flow ipv6
mls nde sender version 5
mls qos statistics-export
mls qos
mls rate-limit multicast ipv4 ip-options 500 50
mls rate-limit all ttl-failure 100 10
no mls acl tcam share-global
mls cef error action freeze
How would you recommend adjusting the interface mls queues?
Thanks,
Hank
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