09-09-2012 05:39 AM - edited 03-07-2019 08:46 AM
Experts can you please help with the following I can see drops on one of our busy L3 vlan in the input queue and are going up very frequently
System image file is "sup-bootflash:s72033-psv-mz.122-18.SXD3.bin
Hardware = 6509
Input queue: 9/75/198/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 18217000 bits/sec, 9700 packets/sec
5 minute output rate 138055000 bits/sec, 14592 packets/sec
L2 Switched: ucast: 357314 pkt, 437562133 bytes - mcast: 1489 pkt, 152397 bytes
L3 in Switched: ucast: 495853 pkt, 109667501 bytes - mcast: 0 pkt, 0 bytes mcast
L3 out Switched: ucast: 728332 pkt, 883364068 bytes mcast: 0 pkt, 0 bytes
541665 packets input, 119252541 bytes, 0 no buffer
Received 1534 broadcasts (19542 IP multicast)
0 runts, 0 giants, 3 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
742857 packets output, 894351706 bytes, 0 underruns
0 output errors, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
Any help is much appreciated is our L3 engine on the 6509 not able to handle that amount of traffic
09-09-2012 05:45 AM
When your input queue is getting filled, this means that the packets are getting punted to the RP/SP CPU which is not the optimal way of packet forwarding on the Cat6ks.Ideally, the PFC should handle all the packets.
So we will have to identify why are the packets getting sent to the CPU.One useful tool to identify this is the Netdr capture. Please look at the following document the explains how this is done.
https://supportforums.cisco.com/docs/DOC-15608
From the Netdr captured packets, try to identify a pattern in the type of packets getting sent to the CPU. That should give us some clue on why we are seeing drops.
Meanwhile, also check for 'show process cpu' on both RP and SP to see if get anything interesting.
Thanks.
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