Please help - Input queue dropping packets
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04-15-2008 08:45 AM - edited 03-05-2019 10:24 PM
Hello People,
We have a router, getting a 100 mg feed, which are mulitcast traffic. When I check the interface, input queue size is 0, and it never builds up, but time to time it just drops packets and "drops" counter goes up.
Input queue: 0/4096/511609/39 (size/max/drops/flushes); Total output drops: 0
511609 input errors, 0 CRC, 0 frame, 0 overrun, 511609 ignored
When I check the buffer, there is 0 misses in cache.
FastEthernet3/0 buffers, 768 bytes (total 529, permanent 400):
129 in free list (128 min, 1200 max allowed)
357 hits, 43 misses, 12 trims, 141 created
0 failures (0 no memory)
400 max cache size, 271 in cache
132768571 hits in cache, 0 misses in cache
14 buffer threshold, 0 threshold transitions
Can somebody explain to me why this is happening?
Thank you so much for your time
-Jinmo
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04-16-2008 10:32 AM
That's normal on a multicast interface as the traffic is bursty by design.
To address some of your concerns:
1) the input queue size is 0 (minimum value)
2) the input queue size is 4096 (maximum value)
Those are the first 2 values in that line (that's your window). You can modify the maximum value with the hold-queue [value] in under the interface. However, I don't see the need for that as you currently have the max.
The other 2 values are self-explanatory.
That's the nature of multicast, it's up to the application to resend the multicast stream that was dropped, if needed.
HTH,
__
Edison.
